From mboxrd@z Thu Jan  1 00:00:00 1970
From: Dario Faggioli <dario.faggioli@citrix.com>
Subject: Re: [xen-unstable test] 88047: regressions - FAIL
Date: Fri, 1 Apr 2016 16:40:00 +0200
Message-ID: <1459521600.5082.280.camel@citrix.com>
References: <osstest-88047-mainreport@xen.org>
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To: Jan Beulich <JBeulich@suse.com>, Ian Jackson <Ian.Jackson@eu.citrix.com>
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On Fri, 2016-04-01 at 07:44 -0600, Jan Beulich wrote:
> > On 01.04.16 at 15:36, <Ian.Jackson@eu.citrix.com> wrote:
> > That message is from libvirt.=C2=A0=C2=A0I don't know the exact situati=
on.
> >=20
> > But we have seen other timeouts with merlot[01].=C2=A0=C2=A0They seem t=
o
> > sometimes have weird stalls when running under Xen.
> Might it be worth trying whether that's a deep C-state issue (by
> temporarily limiting their use of deep C states)?
>=20
IIRC, it's the box(es) with the weird NUMA setup... something about
nodes without any memory:

Apr=C2=A0=C2=A01 01:03:31.095559 (XEN) SRAT: Node 0 PXM 0 0-a0000
Apr=C2=A0=C2=A01 01:03:31.103546 (XEN) SRAT: Node 0 PXM 0 100000-c0000000
Apr=C2=A0=C2=A01 01:03:31.103565 (XEN) SRAT: Node 0 PXM 0 100000000-2400000=
00
Apr=C2=A0=C2=A01 01:03:31.111600 (XEN) SRAT: Node 2 PXM 2 240000000-43f0000=
00
Apr=C2=A0=C2=A01 01:03:31.111619 (XEN) NUMA: Allocated memnodemap from 43ee=
16000 - 43ee1b000
Apr=C2=A0=C2=A01 01:03:31.119615 (XEN) NUMA: Using 8 for the hash shift.
Apr=C2=A0=C2=A01 01:03:31.127613 (XEN) SRAT: Node 1 has no memory. BIOS Bug=
 or mis-configured hardware?
Apr=C2=A0=C2=A01 01:03:31.135548 (XEN) SRAT: Node 3 has no memory. BIOS Bug=
 or mis-configured hardware?

Not that I see how this could cause the long latencies / timeouts, though..=
. :-/

In any case, I think Jan's C states suggestion is worth a shot.

Regards,
Dario
--=20
<<This happens because I choose it to happen!>> (Raistlin Majere)
-----------------------------------------------------------------
Dario Faggioli, Ph.D, http://about.me/dario.faggioli
Senior Software Engineer, Citrix Systems R&D Ltd., Cambridge (UK)


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