lkml.org 
[lkml]   [2020]   [Feb]   [21]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH RESEND v8 1/2] sched/numa: introduce per-cgroup NUMA locality info
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.

\
 
 \ /
  Last update: 2020-02-21 16:29    [W:0.087 / U:0.004 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site