[ovs-discuss] ovs-vswitchd 100% CPU in OVN scale test
Han Zhou
zhouhan at gmail.com
Fri Feb 9 01:55:41 UTC 2018
On Wed, Feb 7, 2018 at 12:47 PM, Han Zhou <zhouhan at gmail.com> wrote:
>
> When doing scale testing for OVN (using
https://github.com/openvswitch/ovn-scale-test), we had some interesting
findings, and need some help here.
>
> We ran the test "create and bind lports" against branch 2.9 and branch
2.6, and we found that 2.6 was must faster. With some analysis, we found
out the reason is not because of OVN gets slower in 2.9, but because the
bottleneck of this test in branch 2.9 is ovs-vswitchd.
>
> The testing was run in an environment with 20 farm nodes, each has 50
sandbox HVs (I will just mention them as HVs in short). Before the test,
there are already 9500 lports bound in 950 HVs on 19 farm nodes. The test
run against the last farm node to bind the lport on the 50 HVs there. The
steps in the test scenario are:
>
> 1. Create 5 new LSs in NB (so that the LSs will not be shared with any of
HVs on other farm nodes)
> 2. create 100 lports in NB on a LS
> 3. bind these lports on HVs, 2 for each HV. They are bound sequentially
on each HV, and for each HV the 2 ports are bound using one command
together: ovs-vsctl add-port <port 1> -- set Interface external-ids:... --
add-port <port 2> -- set Interface external-ids:... (the script didn't set
type to internal, but I hope it is not an issue for this test).
> 4. wait the port stated changed to up in NB for all the 100 lports (with
a single ovn-nbctl command)
>
> These steps are repeated for 5 times, one for each LS. So in the end we
got 500 more lports created and bound (the total scale is then 1k HVs and
10k lports).
>
> When running with 2.6, the ovn-controllers were taking most of the CPU
time. However, with 2.9, the CPU of ovn-controllers spikes but there is
always ovs-vswitchd on the top with 100% CPU. It means the ovs-vswitchd is
the bottleneck in this testing. There is only one ovs-vswitchd with 100% at
the same time and different ovs-vswitchd will spike one after another,
since the ports are bound sequentially on each HV. From the rally log, each
2 ports binding takes around 4 - 5 seconds. This is just the ovs-vsctl
command execution time. The 100% CPU of ovs-vswitchd explains the slowness.
>
> So, based on this result, we can not using the total time to evaluate the
efficiency of OVN, instead we can evaluate by CPU cost of ovn-controller
processes. In fact, 2.9 ovn-controller costs around 70% less CPU than 2.6,
which I think is due to some optimization we made earlier. (With my
work-in-progress patch it saves much more, and I will post later as RFC).
>
> However, I cannot explain why ovs-vswitchd is getting slower than 2.6
when doing port-binding. We need expert suggestions here, for what could be
the possible reason of this slowness. We can do more testing with different
versions between 2.6 and 2.9 to find out related change, but with some
pointers it might save some effort. Below are some logs of ovs-vswitchd
when port binding is happening:
>
> ======
> 2018-02-07T00:12:54.558Z|01767|bridge|INFO|bridge br-int: added interface
lport_bc65cd_QFOU3v on port 1028
> 2018-02-07T00:12:55.629Z|01768|timeval|WARN|Unreasonably long 1112ms poll
interval (1016ms user, 4ms system)
> 2018-02-07T00:12:55.629Z|01769|timeval|WARN|faults: 336 minor, 0 major
> 2018-02-07T00:12:55.629Z|01770|timeval|WARN|context switches: 0
voluntary, 13 involuntary
> 2018-02-07T00:12:55.629Z|01771|coverage|INFO|Event coverage, avg rate
over last: 5 seconds, last minute, last hour, hash=b256889c:
> 2018-02-07T00:12:55.629Z|01772|coverage|INFO|bridge_reconfigure
0.0/sec 0.000/sec 0.0056/sec total: 29
> 2018-02-07T00:12:55.629Z|01773|coverage|INFO|ofproto_flush
0.0/sec 0.000/sec 0.0000/sec total: 1
> 2018-02-07T00:12:55.629Z|01774|coverage|INFO|ofproto_packet_out
0.0/sec 0.000/sec 0.0111/sec total: 90
> 2018-02-07T00:12:55.629Z|01775|coverage|INFO|ofproto_recv_openflow
0.2/sec 0.033/sec 0.4858/sec total: 6673
> 2018-02-07T00:12:55.629Z|01776|coverage|INFO|ofproto_update_port
0.0/sec 0.000/sec 5.5883/sec total: 28258
> 2018-02-07T00:12:55.629Z|01777|coverage|INFO|rev_reconfigure
0.0/sec 0.000/sec 0.0056/sec total: 32
> 2018-02-07T00:12:55.629Z|01778|coverage|INFO|rev_port_toggled
0.0/sec 0.000/sec 0.0011/sec total: 6
> 2018-02-07T00:12:55.629Z|01779|coverage|INFO|rev_flow_table
0.0/sec 0.000/sec 0.0078/sec total: 124
> 2018-02-07T00:12:55.629Z|01780|coverage|INFO|rev_mac_learning
0.0/sec 0.000/sec 0.0036/sec total: 13
> 2018-02-07T00:12:55.629Z|01781|coverage|INFO|xlate_actions
0.0/sec 0.000/sec 0.0111/sec total: 90
> 2018-02-07T00:12:55.629Z|01782|coverage|INFO|ccmap_expand
0.0/sec 0.000/sec 0.0050/sec total: 36
> 2018-02-07T00:12:55.629Z|01783|coverage|INFO|ccmap_shrink
0.0/sec 0.000/sec 0.0000/sec total: 49
> 2018-02-07T00:12:55.629Z|01784|coverage|INFO|cmap_expand
0.0/sec 0.000/sec 0.0217/sec total: 257
> 2018-02-07T00:12:55.629Z|01785|coverage|INFO|cmap_shrink
0.0/sec 0.000/sec 0.0000/sec total: 141
> 2018-02-07T00:12:55.629Z|01786|coverage|INFO|dpif_port_add
0.0/sec 0.000/sec 0.0022/sec total: 1020
> 2018-02-07T00:12:55.629Z|01787|coverage|INFO|dpif_port_del
0.0/sec 0.000/sec 0.0000/sec total: 40
> 2018-02-07T00:12:55.629Z|01788|coverage|INFO|dpif_flow_flush
0.0/sec 0.000/sec 0.0000/sec total: 2
> 2018-02-07T00:12:55.629Z|01789|coverage|INFO|dpif_flow_get
0.0/sec 0.000/sec 0.0000/sec total: 20
> 2018-02-07T00:12:55.629Z|01790|coverage|INFO|dpif_flow_put
0.0/sec 0.000/sec 0.0000/sec total: 21
> 2018-02-07T00:12:55.629Z|01791|coverage|INFO|dpif_flow_del
0.0/sec 0.000/sec 0.0000/sec total: 20
> 2018-02-07T00:12:55.629Z|01792|coverage|INFO|dpif_execute
0.0/sec 0.000/sec 0.0100/sec total: 71
> 2018-02-07T00:12:55.629Z|01793|coverage|INFO|flow_extract
0.0/sec 0.000/sec 0.0000/sec total: 4
> 2018-02-07T00:12:55.629Z|01794|coverage|INFO|miniflow_malloc
0.0/sec 0.000/sec 0.4361/sec total: 6435
> 2018-02-07T00:12:55.629Z|01795|coverage|INFO|hindex_pathological
0.0/sec 0.000/sec 0.0000/sec total: 17
> 2018-02-07T00:12:55.629Z|01796|coverage|INFO|hindex_expand
0.0/sec 0.000/sec 0.0000/sec total: 9
> 2018-02-07T00:12:55.629Z|01797|coverage|INFO|hmap_pathological
0.0/sec 0.000/sec 0.8131/sec total: 13752
> 2018-02-07T00:12:55.630Z|01798|coverage|INFO|hmap_expand
21.0/sec 18.333/sec 11253.0167/sec total: 55905271
> 2018-02-07T00:12:55.630Z|01799|coverage|INFO|hmap_shrink
0.0/sec 0.000/sec 0.0022/sec total: 1029
> 2018-02-07T00:12:55.630Z|01800|coverage|INFO|mac_learning_learned
0.0/sec 0.000/sec 0.0022/sec total: 18
> 2018-02-07T00:12:55.630Z|01801|coverage|INFO|mac_learning_expired
0.0/sec 0.000/sec 0.0017/sec total: 6
> 2018-02-07T00:12:55.630Z|01802|coverage|INFO|netdev_sent
0.0/sec 0.000/sec 0.0400/sec total: 350
> 2018-02-07T00:12:55.630Z|01803|coverage|INFO|netdev_get_stats
203.4/sec 203.400/sec 198.4978/sec total: 798522
> 2018-02-07T00:12:55.630Z|01804|coverage|INFO|txn_unchanged
0.2/sec 0.200/sec 0.1911/sec total: 776
> 2018-02-07T00:12:55.630Z|01805|coverage|INFO|txn_incomplete
0.0/sec 0.000/sec 0.0167/sec total: 106
> 2018-02-07T00:12:55.630Z|01806|coverage|INFO|txn_success
0.0/sec 0.000/sec 0.0111/sec total: 48
> 2018-02-07T00:12:55.630Z|01807|coverage|INFO|poll_create_node
162.6/sec 157.267/sec 156.3664/sec total: 636465
> 2018-02-07T00:12:55.630Z|01808|coverage|INFO|poll_zero_timeout
0.2/sec 0.250/sec 0.4564/sec total: 1936
> 2018-02-07T00:12:55.630Z|01809|coverage|INFO|rconn_queued
0.2/sec 0.033/sec 0.0453/sec total: 1214
> 2018-02-07T00:12:55.630Z|01810|coverage|INFO|rconn_sent
0.2/sec 0.033/sec 0.0453/sec total: 1214
> 2018-02-07T00:12:55.630Z|01811|coverage|INFO|seq_change
1098.8/sec 1099.167/sec 1097.4869/sec total: 4468823
> 2018-02-07T00:12:55.630Z|01812|coverage|INFO|pstream_open
0.0/sec 0.000/sec 0.0000/sec total: 5
> 2018-02-07T00:12:55.630Z|01813|coverage|INFO|stream_open
0.0/sec 0.000/sec 0.0000/sec total: 1
> 2018-02-07T00:12:55.630Z|01814|coverage|INFO|util_xalloc
7223.8/sec 6527.317/sec 51569.9900/sec total: 251999059
> 2018-02-07T00:12:55.630Z|01815|coverage|INFO|vconn_received
0.2/sec 0.033/sec 0.4858/sec total: 6675
> 2018-02-07T00:12:55.630Z|01816|coverage|INFO|vconn_sent
0.2/sec 0.033/sec 0.0453/sec total: 1216
> 2018-02-07T00:12:55.630Z|01817|coverage|INFO|netlink_received
0.0/sec 0.000/sec 0.0000/sec total: 3
> 2018-02-07T00:12:55.630Z|01818|coverage|INFO|netlink_sent
0.0/sec 0.000/sec 0.0000/sec total: 1
> 2018-02-07T00:12:55.630Z|01819|coverage|INFO|57 events never hit
> 2018-02-07T00:12:56.761Z|01820|timeval|WARN|Unreasonably long 1112ms poll
interval (948ms user, 4ms system)
> 2018-02-07T00:12:56.761Z|01821|timeval|WARN|faults: 7 minor, 0 major
> 2018-02-07T00:12:56.761Z|01822|timeval|WARN|context switches: 2
voluntary, 17 involuntary
> 2018-02-07T00:12:56.761Z|01823|coverage|INFO|Event coverage, avg rate
over last: 5 seconds, last minute, last hour, hash=fcc57021:
> 2018-02-07T00:12:56.761Z|01824|coverage|INFO|bridge_reconfigure
0.0/sec 0.000/sec 0.0056/sec total: 30
> 2018-02-07T00:12:56.761Z|01825|coverage|INFO|ofproto_flush
0.0/sec 0.000/sec 0.0000/sec total: 1
> 2018-02-07T00:12:56.761Z|01826|coverage|INFO|ofproto_packet_out
0.0/sec 0.000/sec 0.0111/sec total: 90
> 2018-02-07T00:12:56.761Z|01827|coverage|INFO|ofproto_recv_openflow
0.2/sec 0.033/sec 0.4858/sec total: 6683
> 2018-02-07T00:12:56.761Z|01828|coverage|INFO|ofproto_update_port
0.0/sec 0.000/sec 5.5883/sec total: 29268
> 2018-02-07T00:12:56.761Z|01829|coverage|INFO|rev_reconfigure
0.0/sec 0.000/sec 0.0056/sec total: 33
> 2018-02-07T00:12:56.761Z|01830|coverage|INFO|rev_port_toggled
0.0/sec 0.000/sec 0.0011/sec total: 6
> 2018-02-07T00:12:56.761Z|01831|coverage|INFO|rev_flow_table
0.0/sec 0.000/sec 0.0078/sec total: 124
> 2018-02-07T00:12:56.761Z|01832|coverage|INFO|rev_mac_learning
0.0/sec 0.000/sec 0.0036/sec total: 13
> 2018-02-07T00:12:56.761Z|01833|coverage|INFO|xlate_actions
0.0/sec 0.000/sec 0.0111/sec total: 90
> 2018-02-07T00:12:56.761Z|01834|coverage|INFO|ccmap_expand
0.0/sec 0.000/sec 0.0050/sec total: 36
> 2018-02-07T00:12:56.761Z|01835|coverage|INFO|ccmap_shrink
0.0/sec 0.000/sec 0.0000/sec total: 49
> 2018-02-07T00:12:56.761Z|01836|coverage|INFO|cmap_expand
0.0/sec 0.000/sec 0.0217/sec total: 257
> 2018-02-07T00:12:56.761Z|01837|coverage|INFO|cmap_shrink
0.0/sec 0.000/sec 0.0000/sec total: 141
> 2018-02-07T00:12:56.761Z|01838|coverage|INFO|dpif_port_add
0.0/sec 0.000/sec 0.0022/sec total: 1020
> 2018-02-07T00:12:56.761Z|01839|coverage|INFO|dpif_port_del
0.0/sec 0.000/sec 0.0000/sec total: 40
> 2018-02-07T00:12:56.761Z|01840|coverage|INFO|dpif_flow_flush
0.0/sec 0.000/sec 0.0000/sec total: 2
> 2018-02-07T00:12:56.761Z|01841|coverage|INFO|dpif_flow_get
0.0/sec 0.000/sec 0.0000/sec total: 20
> 2018-02-07T00:12:56.761Z|01842|coverage|INFO|dpif_flow_put
0.0/sec 0.000/sec 0.0000/sec total: 21
> 2018-02-07T00:12:56.761Z|01843|coverage|INFO|dpif_flow_del
0.0/sec 0.000/sec 0.0000/sec total: 20
> 2018-02-07T00:12:56.761Z|01844|coverage|INFO|dpif_execute
0.0/sec 0.000/sec 0.0100/sec total: 71
> 2018-02-07T00:12:56.761Z|01845|coverage|INFO|flow_extract
0.0/sec 0.000/sec 0.0000/sec total: 4
> 2018-02-07T00:12:56.761Z|01846|coverage|INFO|miniflow_malloc
0.0/sec 0.000/sec 0.4361/sec total: 6440
> 2018-02-07T00:12:56.761Z|01847|coverage|INFO|hindex_pathological
0.0/sec 0.000/sec 0.0000/sec total: 17
> 2018-02-07T00:12:56.761Z|01848|coverage|INFO|hindex_expand
0.0/sec 0.000/sec 0.0000/sec total: 9
> 2018-02-07T00:12:56.761Z|01849|coverage|INFO|hmap_pathological
0.0/sec 0.000/sec 0.8131/sec total: 13825
> 2018-02-07T00:12:56.761Z|01850|coverage|INFO|hmap_expand
21.0/sec 18.333/sec 11253.0167/sec total: 57949607
> 2018-02-07T00:12:56.761Z|01851|coverage|INFO|hmap_shrink
0.0/sec 0.000/sec 0.0022/sec total: 1029
> 2018-02-07T00:12:56.761Z|01852|coverage|INFO|mac_learning_learned
0.0/sec 0.000/sec 0.0022/sec total: 18
> 2018-02-07T00:12:56.761Z|01853|coverage|INFO|mac_learning_expired
0.0/sec 0.000/sec 0.0017/sec total: 6
> 2018-02-07T00:12:56.761Z|01854|coverage|INFO|netdev_sent
0.0/sec 0.000/sec 0.0400/sec total: 350
> 2018-02-07T00:12:56.761Z|01855|coverage|INFO|netdev_get_stats
203.4/sec 203.400/sec 198.4978/sec total: 799540
> 2018-02-07T00:12:56.761Z|01856|coverage|INFO|txn_unchanged
0.2/sec 0.200/sec 0.1911/sec total: 777
> 2018-02-07T00:12:56.761Z|01857|coverage|INFO|txn_incomplete
0.0/sec 0.000/sec 0.0167/sec total: 108
> 2018-02-07T00:12:56.761Z|01858|coverage|INFO|txn_success
0.0/sec 0.000/sec 0.0111/sec total: 49
> 2018-02-07T00:12:56.761Z|01859|coverage|INFO|poll_create_node
162.6/sec 157.267/sec 156.3664/sec total: 636681
> 2018-02-07T00:12:56.761Z|01860|coverage|INFO|poll_zero_timeout
0.2/sec 0.250/sec 0.4564/sec total: 1937
> 2018-02-07T00:12:56.761Z|01861|coverage|INFO|rconn_queued
0.2/sec 0.033/sec 0.0453/sec total: 1216
> 2018-02-07T00:12:56.761Z|01862|coverage|INFO|rconn_sent
0.2/sec 0.033/sec 0.0453/sec total: 1216
> 2018-02-07T00:12:56.761Z|01863|coverage|INFO|seq_change
1098.8/sec 1099.167/sec 1097.4869/sec total: 4471434
> 2018-02-07T00:12:56.761Z|01864|coverage|INFO|pstream_open
0.0/sec 0.000/sec 0.0000/sec total: 5
> 2018-02-07T00:12:56.761Z|01865|coverage|INFO|stream_open
0.0/sec 0.000/sec 0.0000/sec total: 1
> 2018-02-07T00:12:56.761Z|01866|coverage|INFO|util_xalloc
7223.8/sec 6527.317/sec 51569.9900/sec total: 260206006
> 2018-02-07T00:12:56.761Z|01867|coverage|INFO|vconn_received
0.2/sec 0.033/sec 0.4858/sec total: 6685
> 2018-02-07T00:12:56.761Z|01868|coverage|INFO|vconn_sent
0.2/sec 0.033/sec 0.0453/sec total: 1218
> 2018-02-07T00:12:56.761Z|01869|coverage|INFO|netlink_received
0.0/sec 0.000/sec 0.0000/sec total: 3
> 2018-02-07T00:12:56.761Z|01870|coverage|INFO|netlink_sent
0.0/sec 0.000/sec 0.0000/sec total: 1
> 2018-02-07T00:12:56.761Z|01871|coverage|INFO|57 events never hit
> 2018-02-07T00:12:57.054Z|01872|bridge|INFO|bridge br-int: added interface
lport_bc65cd_lykjnm on port 1029
> 2018-02-07T00:12:58.202Z|01873|timeval|WARN|Unreasonably long 1179ms poll
interval (1032ms user, 0ms system)
> 2018-02-07T00:12:58.202Z|01874|timeval|WARN|faults: 41 minor, 0 major
> 2018-02-07T00:12:58.202Z|01875|timeval|WARN|context switches: 0
voluntary, 19 involuntary
> 2018-02-07T00:12:58.203Z|01876|coverage|INFO|Event coverage, avg rate
over last: 5 seconds, last minute, last hour, hash=668121b0:
> 2018-02-07T00:12:58.203Z|01877|coverage|INFO|bridge_reconfigure
0.0/sec 0.000/sec 0.0056/sec total: 31
> 2018-02-07T00:12:58.203Z|01878|coverage|INFO|ofproto_flush
0.0/sec 0.000/sec 0.0000/sec total: 1
> 2018-02-07T00:12:58.203Z|01879|coverage|INFO|ofproto_packet_out
0.0/sec 0.000/sec 0.0111/sec total: 90
> 2018-02-07T00:12:58.203Z|01880|coverage|INFO|ofproto_recv_openflow
0.2/sec 0.033/sec 0.4858/sec total: 6733
> 2018-02-07T00:12:58.203Z|01881|coverage|INFO|ofproto_update_port
0.0/sec 0.000/sec 5.5883/sec total: 30279
> 2018-02-07T00:12:58.203Z|01882|coverage|INFO|rev_reconfigure
0.0/sec 0.000/sec 0.0056/sec total: 34
> 2018-02-07T00:12:58.203Z|01883|coverage|INFO|rev_port_toggled
0.0/sec 0.000/sec 0.0011/sec total: 6
> 2018-02-07T00:12:58.203Z|01884|coverage|INFO|rev_flow_table
0.0/sec 0.000/sec 0.0078/sec total: 125
> 2018-02-07T00:12:58.203Z|01885|coverage|INFO|rev_mac_learning
0.0/sec 0.000/sec 0.0036/sec total: 13
> 2018-02-07T00:12:58.203Z|01886|coverage|INFO|xlate_actions
0.0/sec 0.000/sec 0.0111/sec total: 90
> 2018-02-07T00:12:58.203Z|01887|coverage|INFO|ccmap_expand
0.0/sec 0.000/sec 0.0050/sec total: 36
> 2018-02-07T00:12:58.203Z|01888|coverage|INFO|ccmap_shrink
0.0/sec 0.000/sec 0.0000/sec total: 49
> 2018-02-07T00:12:58.203Z|01889|coverage|INFO|cmap_expand
0.0/sec 0.000/sec 0.0217/sec total: 260
> 2018-02-07T00:12:58.203Z|01890|coverage|INFO|cmap_shrink
0.0/sec 0.000/sec 0.0000/sec total: 141
> 2018-02-07T00:12:58.203Z|01891|coverage|INFO|dpif_port_add
0.0/sec 0.000/sec 0.0022/sec total: 1021
> 2018-02-07T00:12:58.203Z|01892|coverage|INFO|dpif_port_del
0.0/sec 0.000/sec 0.0000/sec total: 40
> 2018-02-07T00:12:58.203Z|01893|coverage|INFO|dpif_flow_flush
0.0/sec 0.000/sec 0.0000/sec total: 2
> 2018-02-07T00:12:58.203Z|01894|coverage|INFO|dpif_flow_get
0.0/sec 0.000/sec 0.0000/sec total: 20
> 2018-02-07T00:12:58.203Z|01895|coverage|INFO|dpif_flow_put
0.0/sec 0.000/sec 0.0000/sec total: 21
> 2018-02-07T00:12:58.203Z|01896|coverage|INFO|dpif_flow_del
0.0/sec 0.000/sec 0.0000/sec total: 20
> 2018-02-07T00:12:58.203Z|01897|coverage|INFO|dpif_execute
0.0/sec 0.000/sec 0.0100/sec total: 71
> 2018-02-07T00:12:58.203Z|01898|coverage|INFO|flow_extract
0.0/sec 0.000/sec 0.0000/sec total: 4
> 2018-02-07T00:12:58.203Z|01899|coverage|INFO|miniflow_malloc
0.0/sec 0.000/sec 0.4361/sec total: 6489
> 2018-02-07T00:12:58.203Z|01900|coverage|INFO|hindex_pathological
0.0/sec 0.000/sec 0.0000/sec total: 17
> 2018-02-07T00:12:58.203Z|01901|coverage|INFO|hindex_expand
0.0/sec 0.000/sec 0.0000/sec total: 9
> 2018-02-07T00:12:58.203Z|01902|coverage|INFO|hmap_pathological
0.0/sec 0.000/sec 0.8131/sec total: 13945
> 2018-02-07T00:12:58.203Z|01903|coverage|INFO|hmap_expand
21.0/sec 18.333/sec 11253.0167/sec total: 59998044
> 2018-02-07T00:12:58.203Z|01904|coverage|INFO|hmap_shrink
0.0/sec 0.000/sec 0.0022/sec total: 1030
> 2018-02-07T00:12:58.203Z|01905|coverage|INFO|mac_learning_learned
0.0/sec 0.000/sec 0.0022/sec total: 18
> 2018-02-07T00:12:58.203Z|01906|coverage|INFO|mac_learning_expired
0.0/sec 0.000/sec 0.0017/sec total: 6
> 2018-02-07T00:12:58.203Z|01907|coverage|INFO|netdev_sent
0.0/sec 0.000/sec 0.0400/sec total: 350
> 2018-02-07T00:12:58.203Z|01908|coverage|INFO|netdev_get_stats
203.4/sec 203.400/sec 198.4978/sec total: 799541
> 2018-02-07T00:12:58.203Z|01909|coverage|INFO|txn_unchanged
0.2/sec 0.200/sec 0.1911/sec total: 777
> 2018-02-07T00:12:58.203Z|01910|coverage|INFO|txn_incomplete
0.0/sec 0.000/sec 0.0167/sec total: 110
> 2018-02-07T00:12:58.203Z|01911|coverage|INFO|txn_success
0.0/sec 0.000/sec 0.0111/sec total: 50
> 2018-02-07T00:12:58.203Z|01912|coverage|INFO|poll_create_node
162.6/sec 157.267/sec 156.3664/sec total: 636974
> 2018-02-07T00:12:58.203Z|01913|coverage|INFO|poll_zero_timeout
0.2/sec 0.250/sec 0.4564/sec total: 1939
> 2018-02-07T00:12:58.203Z|01914|coverage|INFO|rconn_queued
0.2/sec 0.033/sec 0.0453/sec total: 1217
> 2018-02-07T00:12:58.203Z|01915|coverage|INFO|rconn_sent
0.2/sec 0.033/sec 0.0453/sec total: 1217
> 2018-02-07T00:12:58.203Z|01916|coverage|INFO|seq_change
1098.8/sec 1099.167/sec 1097.4869/sec total: 4474605
> 2018-02-07T00:12:58.203Z|01917|coverage|INFO|pstream_open
0.0/sec 0.000/sec 0.0000/sec total: 5
> 2018-02-07T00:12:58.203Z|01918|coverage|INFO|stream_open
0.0/sec 0.000/sec 0.0000/sec total: 1
> 2018-02-07T00:12:58.203Z|01919|coverage|INFO|util_xalloc
7223.8/sec 6527.317/sec 51569.9900/sec total: 268435993
> 2018-02-07T00:12:58.203Z|01920|coverage|INFO|vconn_received
0.2/sec 0.033/sec 0.4858/sec total: 6735
> 2018-02-07T00:12:58.203Z|01921|coverage|INFO|vconn_sent
0.2/sec 0.033/sec 0.0453/sec total: 1219
> 2018-02-07T00:12:58.203Z|01922|coverage|INFO|netlink_received
0.0/sec 0.000/sec 0.0000/sec total: 3
> 2018-02-07T00:12:58.203Z|01923|coverage|INFO|netlink_sent
0.0/sec 0.000/sec 0.0000/sec total: 1
> 2018-02-07T00:12:58.203Z|01924|coverage|INFO|57 events never hit
> 2018-02-07T00:12:58.221Z|01925|bridge|INFO|bridge br-int: added interface
patch-br-int-to-provnet-lswitch_bc65cd_Y7sqEw on port 1030
> 2018-02-07T00:12:58.221Z|01926|bridge|INFO|bridge br0: added interface
patch-provnet-lswitch_bc65cd_Y7sqEw-to-br-int on port 15
> 2018-02-07T00:12:59.313Z|01927|timeval|WARN|Unreasonably long 1111ms poll
interval (1092ms user, 0ms system)
> 2018-02-07T00:12:59.313Z|01928|timeval|WARN|faults: 45 minor, 0 major
> 2018-02-07T00:12:59.313Z|01929|timeval|WARN|context switches: 6
voluntary, 59 involuntary
> 2018-02-07T00:12:59.313Z|01930|coverage|INFO|Skipping details of
duplicate event coverage for hash=668121b0
> 2018-02-07T00:13:00.430Z|01931|timeval|WARN|Unreasonably long 1117ms poll
interval (1112ms user, 0ms system)
> 2018-02-07T00:13:00.430Z|01932|timeval|WARN|faults: 34 minor, 0 major
> 2018-02-07T00:13:00.430Z|01933|timeval|WARN|context switches: 2
voluntary, 11 involuntary
> 2018-02-07T00:13:00.431Z|01934|coverage|INFO|Event coverage, avg rate
over last: 5 seconds, last minute, last hour, hash=a612a6e0:
> 2018-02-07T00:13:00.431Z|01935|coverage|INFO|bridge_reconfigure
0.8/sec 0.067/sec 0.0067/sec total: 33
> 2018-02-07T00:13:00.431Z|01936|coverage|INFO|ofproto_flush
0.0/sec 0.000/sec 0.0000/sec total: 1
> 2018-02-07T00:13:00.431Z|01937|coverage|INFO|ofproto_packet_out
0.2/sec 0.017/sec 0.0114/sec total: 92
> 2018-02-07T00:13:00.431Z|01938|coverage|INFO|ofproto_recv_openflow
32.2/sec 2.717/sec 0.5306/sec total: 6935
> 2018-02-07T00:13:00.431Z|01939|coverage|INFO|ofproto_update_port
808.8/sec 67.400/sec 6.7117/sec total: 32303
> 2018-02-07T00:13:00.431Z|01940|coverage|INFO|rev_reconfigure
0.8/sec 0.067/sec 0.0067/sec total: 36
> 2018-02-07T00:13:00.431Z|01941|coverage|INFO|rev_port_toggled
0.0/sec 0.000/sec 0.0011/sec total: 7
> 2018-02-07T00:13:00.431Z|01942|coverage|INFO|rev_flow_table
0.4/sec 0.033/sec 0.0083/sec total: 126
> 2018-02-07T00:13:00.431Z|01943|coverage|INFO|rev_mac_learning
0.0/sec 0.000/sec 0.0036/sec total: 13
> 2018-02-07T00:13:00.431Z|01944|coverage|INFO|xlate_actions
0.2/sec 0.017/sec 0.0114/sec total: 92
> 2018-02-07T00:13:00.431Z|01945|coverage|INFO|ccmap_expand
0.0/sec 0.000/sec 0.0050/sec total: 36
> 2018-02-07T00:13:00.431Z|01946|coverage|INFO|ccmap_shrink
0.0/sec 0.000/sec 0.0000/sec total: 49
> 2018-02-07T00:13:00.431Z|01947|coverage|INFO|cmap_expand
2.0/sec 0.167/sec 0.0244/sec total: 271
> 2018-02-07T00:13:00.431Z|01948|coverage|INFO|cmap_shrink
0.0/sec 0.000/sec 0.0000/sec total: 141
> 2018-02-07T00:13:00.431Z|01949|coverage|INFO|dpif_port_add
0.4/sec 0.033/sec 0.0028/sec total: 1021
> 2018-02-07T00:13:00.431Z|01950|coverage|INFO|dpif_port_del
0.0/sec 0.000/sec 0.0000/sec total: 40
> 2018-02-07T00:13:00.431Z|01951|coverage|INFO|dpif_flow_flush
0.0/sec 0.000/sec 0.0000/sec total: 2
> 2018-02-07T00:13:00.431Z|01952|coverage|INFO|dpif_flow_get
0.0/sec 0.000/sec 0.0000/sec total: 20
> 2018-02-07T00:13:00.431Z|01953|coverage|INFO|dpif_flow_put
0.0/sec 0.000/sec 0.0000/sec total: 21
> 2018-02-07T00:13:00.431Z|01954|coverage|INFO|dpif_flow_del
0.0/sec 0.000/sec 0.0000/sec total: 20
> 2018-02-07T00:13:00.431Z|01955|coverage|INFO|dpif_execute
0.0/sec 0.000/sec 0.0100/sec total: 72
> 2018-02-07T00:13:00.431Z|01956|coverage|INFO|flow_extract
0.0/sec 0.000/sec 0.0000/sec total: 4
> 2018-02-07T00:13:00.431Z|01957|coverage|INFO|miniflow_malloc
30.8/sec 2.567/sec 0.4789/sec total: 6689
> 2018-02-07T00:13:00.431Z|01958|coverage|INFO|hindex_pathological
0.0/sec 0.000/sec 0.0000/sec total: 17
> 2018-02-07T00:13:00.431Z|01959|coverage|INFO|hindex_expand
0.0/sec 0.000/sec 0.0000/sec total: 9
> 2018-02-07T00:13:00.431Z|01960|coverage|INFO|hmap_pathological
76.8/sec 6.400/sec 0.9197/sec total: 14149
> 2018-02-07T00:13:00.431Z|01961|coverage|INFO|hmap_expand
1637509.8/sec 136476.267/sec 13527.3358/sec total: 64098893
> 2018-02-07T00:13:00.431Z|01962|coverage|INFO|hmap_shrink
0.4/sec 0.033/sec 0.0028/sec total: 1030
> 2018-02-07T00:13:00.431Z|01963|coverage|INFO|mac_learning_learned
0.0/sec 0.000/sec 0.0022/sec total: 19
> 2018-02-07T00:13:00.431Z|01964|coverage|INFO|mac_learning_expired
0.0/sec 0.000/sec 0.0017/sec total: 6
> 2018-02-07T00:13:00.431Z|01965|coverage|INFO|netdev_sent
0.0/sec 0.000/sec 0.0400/sec total: 359
> 2018-02-07T00:13:00.431Z|01966|coverage|INFO|netdev_get_stats
204.4/sec 203.483/sec 198.7817/sec total: 799543
> 2018-02-07T00:13:00.431Z|01967|coverage|INFO|txn_unchanged
0.2/sec 0.200/sec 0.1914/sec total: 777
> 2018-02-07T00:13:00.431Z|01968|coverage|INFO|txn_incomplete
1.4/sec 0.117/sec 0.0186/sec total: 113
> 2018-02-07T00:13:00.431Z|01969|coverage|INFO|txn_success
0.6/sec 0.050/sec 0.0119/sec total: 51
> 2018-02-07T00:13:00.431Z|01970|coverage|INFO|poll_create_node
241.8/sec 164.833/sec 156.7022/sec total: 637792
> 2018-02-07T00:13:00.431Z|01971|coverage|INFO|poll_zero_timeout
1.8/sec 0.367/sec 0.4589/sec total: 1944
> 2018-02-07T00:13:00.431Z|01972|coverage|INFO|rconn_queued
1.2/sec 0.133/sec 0.0469/sec total: 1219
> 2018-02-07T00:13:00.431Z|01973|coverage|INFO|rconn_sent
1.2/sec 0.133/sec 0.0469/sec total: 1219
> 2018-02-07T00:13:00.431Z|01974|coverage|INFO|seq_change
2679.2/sec 1230.183/sec 1101.2081/sec total: 4481090
> 2018-02-07T00:13:00.431Z|01975|coverage|INFO|pstream_open
0.0/sec 0.000/sec 0.0000/sec total: 5
> 2018-02-07T00:13:00.431Z|01976|coverage|INFO|stream_open
0.0/sec 0.000/sec 0.0000/sec total: 1
> 2018-02-07T00:13:00.431Z|01977|coverage|INFO|util_xalloc
6573732.0/sec 553875.117/sec 60700.1733/sec total: 284890464
> 2018-02-07T00:13:00.431Z|01978|coverage|INFO|vconn_received
32.2/sec 2.717/sec 0.5306/sec total: 6937
> 2018-02-07T00:13:00.431Z|01979|coverage|INFO|vconn_sent
1.2/sec 0.133/sec 0.0469/sec total: 1221
> 2018-02-07T00:13:00.431Z|01980|coverage|INFO|netlink_received
0.0/sec 0.000/sec 0.0000/sec total: 3
> 2018-02-07T00:13:00.431Z|01981|coverage|INFO|netlink_sent
0.0/sec 0.000/sec 0.0000/sec total: 1
> 2018-02-07T00:13:00.431Z|01982|coverage|INFO|57 events never hit
> 2018-02-07T00:13:00.431Z|01983|poll_loop|INFO|Dropped 6 log messages in
last 217 seconds (most recently, 216 seconds ago) due to excessive rate
> 2018-02-07T00:13:00.431Z|01984|poll_loop|INFO|wakeup due to [POLLIN] on
fd 112 (/root/sandbox-192.168.64.0/br-int.mgmt<->) at
../lib/stream-fd.c:157 (90% CPU usage)
>
> I managed to capture a perf record when a ovs-vswitchd is spiking, not
sure if it helps:
> Samples: 6K of event 'cycles:pp', Event count (approx.): 118132588562209
> Children Self Command Shared Object Symbol
◆
> + 66.01% 0.00% ovs-vswitchd ovs-vswitchd [.] _start
▒
> + 66.01% 0.00% ovs-vswitchd libc-2.23.so [.]
__libc_start_main
▒
> + 66.01% 0.00% ovs-vswitchd ovs-vswitchd [.] main
▒
> + 66.01% 0.00% ovs-vswitchd ovs-vswitchd [.] bridge_run
▒
> + 66.01% 0.00% ovs-vswitchd ovs-vswitchd [.] bridge_run__
▒
> + 41.88% 0.00% ovs-vswitchd ovs-vswitchd [.]
ofproto_type_run
▒
> + 41.88% 0.00% ovs-vswitchd ovs-vswitchd [.] type_run
▒
> + 24.13% 0.00% ovs-vswitchd ovs-vswitchd [.]
bridge_reconfigure
▒
> + 24.13% 0.00% ovs-vswitchd ovs-vswitchd [.] ofproto_run
▒
> + 24.13% 0.00% ovs-vswitchd ovs-vswitchd [.] update_port
▒
> + 23.31% 0.00% ovs-vswitchd ovs-vswitchd [.] update_mtu
▒
> + 23.31% 0.00% ovs-vswitchd ovs-vswitchd [.]
update_mtu_ofproto
▒
> + 23.31% 0.00% ovs-vswitchd ovs-vswitchd [.]
ofport_is_mtu_overridden
▒
> + 23.27% 0.00% ovs-vswitchd ovs-vswitchd [.]
xlate_txn_start
▒
> + 23.27% 0.00% ovs-vswitchd ovs-vswitchd [.]
xlate_xport_copy
▒
> + 23.27% 0.00% ovs-vswitchd libjemalloc.so.1 [.] calloc
▒
> + 23.27% 0.00% ovs-vswitchd ovs-vswitchd [.] xcalloc
▒
> + 23.27% 23.27% ovs-vswitchd libc-2.23.so [.]
0x000000000008f294
▒
> + 22.38% 0.00% ovs-vswitchd ovs-vswitchd [.]
ofproto_class_find__
▒
> + 22.38% 0.00% ovs-vswitchd ovs-vswitchd [.]
ofproto_port_open_type
▒
> + 20.96% 0.00% ovs-vswitchd ovs-vswitchd [.]
dp_enumerate_types
▒
> + 20.14% 20.14% ovs-vswitchd libjemalloc.so.1 [.] malloc
▒
> + 19.43% 0.81% ovs-vswitchd ovs-vswitchd [.]
ovs_mutex_lock_at
▒
> + 19.33% 0.00% ovs-vswitchd ovs-vswitchd [.] sset_add__
▒
> + 19.33% 0.00% ovs-vswitchd ovs-vswitchd [.] xmalloc
▒
> + 18.62% 18.62% ovs-vswitchd libpthread-2.23.so [.]
pthread_mutex_lock
▒
> + 18.61% 0.00% ovs-vswitchd ovs-vswitchd [.]
dpif_netdev_run
▒
> + 18.61% 0.00% ovs-vswitchd ovs-vswitchd [.]
dp_netdev_process_rxq_port
▒
> + 18.61% 0.00% ovs-vswitchd ovs-vswitchd [.]
netdev_rxq_recv
▒
> + 18.61% 0.00% ovs-vswitchd ovs-vswitchd [.]
netdev_dummy_rxq_recv
▒
> + 13.03% 0.00% revalidator66 [kernel.kallsyms] [k]
entry_SYSCALL_64_fastpath
▒
> + 13.03% 0.00% revalidator66 libc-2.23.so [.] __clone
▒
> + 13.03% 0.00% revalidator66 libpthread-2.23.so [.] start_thread
▒
>
> Thanks,
> Han
Interestingly, I located the change that slows down the port-binding:
===
commit 2d4beba14ae1075a7baf34fa57424edaf4eb7697
Author: Numan Siddique <nusiddiq at redhat.com>
Date: Tue Sep 12 14:22:03 2017 +0530
ofproto: Include patch ports in mtu overriden check
When a patch port is deleted from the bridge (with no other ports
in the bridge) and if the bridge was set to an MTU by the user earlier,
the
MTU of the bridge is overriden to 1500. Please see the below link for
the
steps to reproduce the issue.
This patch fixes this issue.
Reported-at:
https://mail.openvswitch.org/pipermail/ovs-dev/2017-September/338665.html
Signed-off-by: Numan Siddique <nusiddiq at redhat.com>
Signed-off-by: Ben Pfaff <blp at ovn.org>
===
It perfectly matches the perf output shared above when ovs-vswitchd is
running hot.
> + 24.13% 0.00% ovs-vswitchd ovs-vswitchd [.] ofproto_run
▒
> + 24.13% 0.00% ovs-vswitchd ovs-vswitchd [.] update_port
▒
> + 23.31% 0.00% ovs-vswitchd ovs-vswitchd [.] update_mtu
▒
> + 23.31% 0.00% ovs-vswitchd ovs-vswitchd [.]
update_mtu_ofproto
▒
> + 23.31% 0.00% ovs-vswitchd ovs-vswitchd [.]
ofport_is_mtu_overridden
▒
...
I will study more on the details of how it is triggered and look at how to
optimize it. Any suggestions are welcome.
cc Numan & Ben.
Thanks,
Han
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