From: Andrew Cooper <andrew.cooper3@citrix.com>
To: Ian Campbell <Ian.Campbell@citrix.com>
Cc: Dario Faggioli <dario.faggioli@citrix.com>,
xen-devel <xen-devel@lists.xen.org>
Subject: Re: Spurious "NUMA placement failed, performance might be affected" message on ARM
Date: Mon, 28 Apr 2014 13:15:29 +0100 [thread overview]
Message-ID: <535E4661.70700@citrix.com> (raw)
In-Reply-To: <1398684642.29700.71.camel@kazak.uk.xensource.com>
On 28/04/14 12:30, Ian Campbell wrote:
> On Mon, 2014-04-28 at 11:01 +0100, Ian Campbell wrote:
> [...]
>> total_memory : 8184
>> free_memory : 6933
> [...]
>> node: memsize memfree distances
>> 0: 4088 3861 20
> I think we are missing some RAM here...
>
> and I have now noticed that I only see this for guests which have more
> RAM than this memfree value (+/- some slop). The guests succeed because
> there is actually RAM available.
>
> I think this is enough for me to now track down the cause on the
> hypervisor side. Thanks for your input.
>
> Ian.
Do be aware that the memsize value is "number of pages on this node"
which includes IO mappings of non-ram regions, and as a result memfree
is mostly fictitious.
I raised this as a concern with the hwloc code, but without any
subsequent discussion.
~Andrew
next prev parent reply other threads:[~2014-04-28 12:15 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-04-25 10:37 Spurious "NUMA placement failed, performance might be affected" message on ARM Ian Campbell
2014-04-28 9:55 ` Dario Faggioli
2014-04-28 10:01 ` Ian Campbell
2014-04-28 10:25 ` Dario Faggioli
2014-04-28 11:30 ` Ian Campbell
2014-04-28 12:15 ` Andrew Cooper [this message]
2014-04-29 15:36 ` Dario Faggioli
2014-04-28 12:23 ` Dario Faggioli
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