Hi,
Since openvswitch has moved to multi-threaded model, RSS usage of
ovs-vswitchd has increased quite significantly compared to the last
release we used (ovs-1.4.x). Part of the problem is using mlockall (with
MCL_CURRENT|MCL_FUTURE) on ovs-vswitchd, which causes every pthreads
stack's and heap's virtual address to locked to RAM. ovs-vswitch (2.1.x)
running on a 8 vCPU dom0 (10 pthreads) uses around 89M of RSS (80MB just
for stack), without any VMs running on the host. One way to reduce RSS
would be to reduce the number of "n-handler-threads" and
"n-revalidator-threads", but I am not sure about the performance impact
of having these thread numbers reduced. I am wondering if the stack size
of the pthreads can be reduce (using pthread_attr_setstack). By default
pthreads max stack size is 8MB and mlockall locks all of this 8MB into
RAM. What could be optimal stack size that can be used.
Thanks,
Anoob.
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