On Tue, Jul 28, 2015 at 4:55 PM, Ian Campbell <ian.campbell@citrix.com>
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,
-Christoffer