[ovs-build] Failed: istokes/ovs#926 (detailed_packet_drop_stats - 5156284)

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Mon Jul 15 13:55:23 UTC 2019


Build Update for istokes/ovs
-------------------------------------

Build: #926
Status: Failed

Duration: 2 mins and 16 secs
Commit: 5156284 (detailed_packet_drop_stats)
Author: Sriram Vatala via dev
Message: Detailed packet drop statistics per dpdk and vhostuser ports

OVS may be unable to transmit packets for multiple reasons and
today there is a single counter to track packets dropped due to
any of those reasons. The most common reason is that a VM is
unable to read packets fast enough causing the vhostuser port
transmit queue on the OVS side to become full. This manifests
as a problem with VNFs not receiving all packets. Having a
separate drop counter to track packets dropped because the
transmit queue is full will clearly indicate that the problem
is on the VM side and not in OVS. Similarly maintaining separate
counters for all possible drops helps in indicating sensible
cause for packet drops.

This patch adds counters to track packets dropped due to all
possible reasons and these counters are displayed along with
other stats in "ovs-vsctl get interface <iface> statistics"
command. The detailed stats will be available for both dpdk and
vhostuser ports.

Following are the details of the new counters :

tx_failed_drops : Sometimes DPDK physical/vHost port transmit
API fails to send all/some packets. These untransmited packets
are dropped.The most likely reason for this to happen is
because of transmit queue overrun. Besides transmit queue
overrun, there are other unlikely reasons such as invalid
queue id etc.

tx_mtu_exceeded_drops : These are the packets dropped due
to MTU mismatch (i.e Pkt len > Max Dev MTU).

tx_qos_drops/rx_qos_drops : These are the packets dropped due
to transmission/reception rate exceeding the configured
Egress/Ingress policer rate on the interface.

Signed-off-by: Sriram Vatala <sriram.v at altencalsoftlabs.com>

View the changeset: https://github.com/istokes/ovs/compare/299c8d611e92^...5156284e5e33

View the full build log and details: https://travis-ci.org/istokes/ovs/builds/558895464?utm_medium=notification&utm_source=email

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