From: Dario Faggioli <dario.faggioli@citrix.com>
To: Ian Campbell <ian.campbell@citrix.com>
Cc: Wei Liu <wei.liu2@citrix.com>,
Stefano Stabellini <stefano.stabellini@eu.citrix.com>,
Ian Jackson <Ian.Jackson@eu.citrix.com>,
xen-devel@lists.xen.org, Jan Beulich <JBeulich@suse.com>,
Anthony PERARD <anthony.perard@citrix.com>
Subject: Re: [PATCH V3] libxl: Increase device model startup timeout to 1min.
Date: Tue, 14 Jul 2015 11:25:41 +0200 [thread overview]
Message-ID: <1436865941.13522.68.camel@citrix.com> (raw)
In-Reply-To: <1436860520.7019.140.camel@citrix.com>
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On Tue, 2015-07-14 at 08:55 +0100, Ian Campbell wrote:
> On Tue, 2015-07-14 at 07:17 +0100, Jan Beulich wrote:
> > >>> On 07.07.15 at 17:41, <ian.campbell@citrix.com> wrote:
> > > On Tue, 2015-07-07 at 16:14 +0100, Ian Jackson wrote:
> > >> Anthony PERARD writes ("[PATCH V3] libxl: Increase device model startup
> > > timeout to 1min."):
> > >> > On a busy host, QEMU may take more than 10s to load and start.
> > >> >
> > >> > This is likely due to a bug in Linux where the I/O subsystem sometime
> > >> > produce high latency under load and result in QEMU taking a long time to
> > >> > load every single dynamic libraries.
> > >>
> > >> Acked-by: Ian Jackson <ian.jackson@eu.citrix.com>
> > >
> > > Applied.
> >
> > So is this the "answer" to "Problems with merlot* AMD Opteron 6376
> > systems"?
>
> It'll be hard to say until this change gets through the Xen push gate
> and that version gets used for other branches (linux testing, libvirt,
> ovmf, osstest's own gate etc).
>
Indeed. My opinion is that no, it is not.
My understanding of the data Anthony provided is that, under some
(difficult to track/analyze/reproduce/etc) load conditions, the Linux IO
and VM subsystem suffer from high latency, delaying QEMU startup.
In the merlot* cases, the system is completely idle, apart from the
failing creation/migration operation.
So, no, I don't think that would not be the fix we need for that
situation.
> At the moment it looks like it has helped with some but not all of the
> issues.
>
> These:
>
> http://logs.test-lab.xenproject.org/osstest/results/host/merlot0.html
> http://logs.test-lab.xenproject.org/osstest/results/host/merlot1.html
>
Can I ask why (I mean, e.g., comparing what with what) you're saying it
seems to have helped?
Regards,
Dario
--
<<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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next prev parent reply other threads:[~2015-07-14 9:25 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-06-26 11:57 [PATCH] libxl: Increase device model startup timeout to 1min Anthony PERARD
2015-06-26 16:41 ` Ian Campbell
2015-06-29 14:23 ` Anthony PERARD
2015-06-29 14:51 ` Ian Campbell
2015-06-29 16:09 ` Anthony PERARD
2015-06-30 3:08 ` Dario Faggioli
2015-06-30 14:04 ` Ian Jackson
2015-06-30 15:58 ` Stefano Stabellini
2015-06-30 16:40 ` Ian Jackson
2015-07-01 15:03 ` Stefano Stabellini
2015-07-02 11:11 ` Anthony PERARD
2015-07-02 12:38 ` Ian Jackson
2015-07-03 11:21 ` Anthony PERARD
2015-07-03 11:30 ` Ian Jackson
2015-07-07 13:44 ` Ian Campbell
2015-07-07 13:47 ` Ian Jackson
2015-07-07 14:37 ` [PATCH V2] " Anthony PERARD
2015-07-07 14:41 ` Ian Jackson
2015-07-07 15:09 ` [PATCH V3] " Anthony PERARD
2015-07-07 15:14 ` Ian Jackson
2015-07-07 15:41 ` Ian Campbell
2015-07-14 6:17 ` Jan Beulich
2015-07-14 7:55 ` Ian Campbell
2015-07-14 9:25 ` Dario Faggioli [this message]
2015-07-14 9:37 ` Ian Campbell
2015-07-14 10:52 ` Dario Faggioli
2015-07-14 14:23 ` Dario Faggioli
2015-07-14 14:48 ` Ian Campbell
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