[ovs-discuss] Question on ovs 1.11.0 megaflow

Jian Qiu swordqiu at gmail.com
Sat Oct 19 01:05:36 UTC 2013


Hi,


Previously, we used ovs 1.4.x and found ovs-vswitchd dropping logs. Then we
upgraded to ovs 1.11.0 as suggested on this mailing list. We did observe
drop of the CPU utilization on host.

However, we still randomly found ovs-vswitchd dropping logs. Some ovs logs
are pasted below.

I have two questions:

1) As megaflow was introduced in ovs 1.11.0, I'm wondering whether megaflow
is transparent to userspace? i.e. is there any specific requirement on flow
configuration so that we can fully utilize the power of megaflow?

2) As logs show, we persistently observed "failed to flow_del" messages in
our ovs logs. I'm wondering what's the cause for this warning message?

Looking forward to your kind help.

Many thanks.

Jian Qiu

=== ovs logs ====

2013-10-18T04:00:23Z|4395745|dpif|WARN|Dropped 1120 log messages in last 1
seconds (most recently, 1 seconds ago) due to excessive rate
2013-10-18T04:00:23Z|4395746|dpif|WARN|system at ovs-system: failed to
flow_del (No such file or directory)
skb_priority(0),in_port(10),skb_mark(0),eth(src=54:25:8a:6c:5b:9d,dst=00:22:16:3b:ec:0d),eth_type(0x0800),ipv4(src=10.64.13.218,dst=10.64.15.204,proto=6,tos=0,ttl=63,frag=no),tcp(src=4401,dst=49559)
2013-10-18T04:00:24Z|4395747|dpif|WARN|Dropped 1120 log messages in last 1
seconds (most recently, 1 seconds ago) due to excessive rate
2013-10-18T04:00:24Z|4395748|dpif|WARN|system at ovs-system: failed to
flow_del (No such file or directory)
skb_priority(0),in_port(10),skb_mark(0),eth(src=54:25:8a:6c:5b:9d,dst=00:22:16:3b:ec:0d),eth_type(0x0800),ipv4(src=10.64.13.218,dst=10.64.15.204,proto=6,tos=0,ttl=63,frag=no),tcp(src=4401,dst=49559)
2013-10-18T04:00:25Z|4395749|dpif|WARN|Dropped 1120 log messages in last 1
seconds (most recently, 1 seconds ago) due to excessive rate
2013-10-18T04:00:25Z|4395750|dpif|WARN|system at ovs-system:
f2013-10-18T15:03:18Z|00001|vlog|INFO|opened log file
/usr/local/var/log/openvswitch/ovs-vswitchd.log
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