Re: [Xen-devel] Dom0 crash with apache bench (ab)

[Christoffer Dall <christofferdall@xxxxxxxxx>]

On Tue, Jul 28, 2015 at 4:55 PM, Ian Campbell <ian.campbell@xxxxxxxxxx> wrote:

On Tue, 2015-07-28 at 10:50 -0400, Konrad Rzeszutek Wilk wrote:
> On Tue, Jul 28, 2015 at 03:09:31PM +0200, Christoffer Dall wrote:
> > Hi,
> >
> > I've been doing some performance comparisons lately, and wanted to
> > compare
> > the performance overhead of using Xen with apache bench, but
> > unfortunately
> > the Dom0 kernel crashes when hitting it with ab from a remote machine.
> > Most other workloads seem to be stable, however, I do see similar
> > crashes
> > if hitting Dom0 mysql with a mysql benchmark with a high level of
> > parallelism.
> >
> > I use a 10G Mellanox MX354A Dual port FDR CX3 adapter for networking on
> > a
> > Dell PowerEdge R320 system with a Xeon E5-2450 and 16 GB of RAM.
> >
> > Interestingly, we had a similarly looking issue on arm64 recently, but
> > that
> > was fixed with an APM-soecific fix to the hypervisor, so I am guessing
> > this
> > is unrelated, see:
> > http://lists.xenproject.org/archives/html/xen-devel/2015
> > -03/msg02731.html
> > and the fix:
> > http://xenbits.xen.org/gitweb/?p=xen.git;a=commit;h=50dcb3de603927db2fd
> > 87ba09e29c817415aaa44
> >
> > I have tried with several Linux versions, v3.13, v3.18, v4.0-rc4, and
> > v4.1,
> > same issue. I have tried with Xen 4.5-0 release, and the Ubuntu
> > packaged
> > Xen 4.4 release, same issue.
> >
> > Examples of crash:
> > http://pastebin.ubuntu.com/11953498/
> > http://pastebin.ubuntu.com/11953443/
>
> 4.0-rc4?
>
> Have you tried 4.1?

According to the previous paragraph, yes he has.

yes, I have. Just for clarify, I used 4.0-rc4 because that's a branch which contained arm64 PCI support and has been used for other measurements, so this was simply my 'working tree'.

Thanks,

-ChristofferÂ

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