I know this has been open for a year now, but for what it's worth, we're
seeing the same issue on two of our three Neutron nodes. A whole lot of
entries in /var/log/openvswitch/ovs-vswitchd.log like the following:
2020-05-22T00:19:25.581Z|18410|poll_loop(handler74)|INFO|Dropped 2973816 log
messages in last 6 seconds (most recently, 0 seconds ago) due to excessive rate
2020-05-22T00:19:25.581Z|18411|poll_loop(handler74)|INFO|wakeup due to [POLLIN]
on fd 35 (unknown anon_inode:[eventpoll]) at ../lib/dpif-netlink.c:2786 (98%
CPU usage)
We're running Neutron in Rocky on Ubuntu 18.04:
# uname -r
4.15.0-99-generic
# dpkg -l | grep openvswitch-
ii neutron-openvswitch-agent 2:13.0.6-0ubuntu1~cloud0
all Neutron is a virtual network service for Openstack -
Open vSwitch plugin agent
ii openvswitch-common 2.10.0-0ubuntu2~cloud0
amd64 Open vSwitch common components
ii openvswitch-switch 2.10.0-0ubuntu2~cloud0
amd64 Open vSwitch switch implementations
Looking at the ovs-vswitchd process itself:
# timeout 10 strace -c -p 1227
strace: Process 1227 attached
strace: Process 1227 detached
% time seconds usecs/call calls errors syscall
------ ----------- ----------- --------- --------- ----------------
96.28 9.059391 28852 314 poll
3.03 0.284833 284833 1 restart_syscall
0.28 0.026164 13 1968 sendmsg
0.27 0.025726 67 385 208 recvfrom
0.07 0.006302 3 2220 252 recvmsg
0.02 0.002327 7 315 69 read
0.02 0.002157 2 930 171 futex
0.02 0.002075 5 378 378 accept
0.01 0.000532 2 316 getrusage
0.00 0.000238 14 17 sendto
0.00 0.000034 11 3 write
------ ----------- ----------- --------- --------- ----------------
100.00 9.409779 6847 1078 total
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https://bugs.launchpad.net/bugs/1827264
Title:
ovs-vswitchd thread consuming 100% CPU
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