Messages in this thread | | | Date | Fri, 21 Feb 2020 16:28:24 +0100 | From | Peter Zijlstra <> | Subject | Re: [PATCH RESEND v8 1/2] sched/numa: introduce per-cgroup NUMA locality info |
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On Mon, Feb 17, 2020 at 09:23:52PM +0800, 王贇 wrote: > FYI, by monitoring locality, we found that the kvm vcpu thread is not > covered by NUMA Balancing, whatever how many maximum period passed, the > counters are not increasing, or very slowly, although inside guest we are > copying memory. > > Later we found such task rarely exit to user space to trigger task > work callbacks, and NUMA Balancing scan depends on that, which help us > realize the importance to enable NUMA Balancing inside guest, with the > correct NUMA topo, a big performance risk I'll say :-P
That's a bug in KVM, see:
https://lkml.kernel.org/r/20190801143657.785902257@linutronix.de https://lkml.kernel.org/r/20190801143657.887648487@linutronix.de
ISTR there being newer versions of that patch-set, but I can't seem to find them in a hurry.
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