Re: numa involved in instability and swap usage despite RAM free?

From: Adrian Chadd <adrian.chadd_at_gmail.com>
Date: Tue, 26 Jun 2018 14:39:27 -0700
Hi,

Aren't there now per-domain VM counters you can query via sysctl?
Maybe they'd help in diagnosing what's going on.



-adrian

On Mon, 25 Jun 2018 at 11:23, Steve Kargl
<sgk_at_troutmask.apl.washington.edu> wrote:
>
> On Sun, Jun 24, 2018 at 12:03:29PM +0200, Alexander Leidinger wrote:
> >
> > I don't have hard evidence, but there is enough "smell" to open up a
> > discussion...
> >
> > Short:
> > Can it be that enabling numa in the kernel is the reason why some
> > people see instability with zfs and usage of swap while a lot of free
> > RAM is available?
>
> Interesting observation.  I do have NUMA in my kernel, and swap
> seems to be used instead of recycling freeing inactive memory.
> Top shows
>
> Mem: 506M Active, 27G Inact, 98M Laundry, 2735M Wired, 1474M Buf, 1536M Free
> Swap: 16G Total, 120M Used, 16G Free
>
> Perhaps, I don't understand what is meant by inactive memory.  I
> thought that this means memory is still available in the buffer
> cache, but nothing is current using what is there.
>
> --
> Steve
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Received on Tue Jun 26 2018 - 19:39:44 UTC

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