From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
To: Christoffer Dall <cdall@cs.columbia.edu>
Cc: xen-devel@lists.xen.org
Subject: Re: Dom0 crash with apache bench (ab)
Date: Tue, 28 Jul 2015 10:50:22 -0400 [thread overview]
Message-ID: <20150728145022.GE26623@x230.dumpdata.com> (raw)
In-Reply-To: <CAEDV+gJ1MyAPbfX-rp6eNKacecQfn9LNpSGC7BuSYFep+0iG2w@mail.gmail.com>
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=50dcb3de603927db2fd87ba09e29c817415aaa44
>
> 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?
>
> Running DomU with a bridge and running ab against apache running in a DomU
> also causes the system to crash.
>
> Note: The server also has an embedded 1G Broadcom NIC (although not
> suitable for testing due to it being 1G and on a control network), and
> using that for the test does not cause a system crash, so this points to
> some difficulties with the Mellanox device and Xen.
>
> Any ideas or advice is greatly appreciated, thanks.
>
> -Christoffer
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@lists.xen.org
> http://lists.xen.org/xen-devel
next prev parent reply other threads:[~2015-07-28 14:50 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-07-28 13:09 Dom0 crash with apache bench (ab) Christoffer Dall
2015-07-28 14:50 ` Konrad Rzeszutek Wilk [this message]
2015-07-28 14:55 ` Ian Campbell
2015-07-28 15:00 ` Christoffer Dall
2015-07-31 10:24 ` Stefano Stabellini
2015-07-31 10:28 ` David Vrabel
2015-07-31 13:17 ` Christoffer Dall
2015-09-14 12:40 ` Christoffer Dall
2015-09-14 15:11 ` Konrad Rzeszutek Wilk
2015-09-14 15:20 ` Ian Campbell
2015-09-14 16:16 ` Christoffer Dall
2015-09-28 20:53 ` Christoffer Dall
2015-09-30 15:12 ` Konrad Rzeszutek Wilk
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