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

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

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@xxxxxxxxxxxxx
> http://lists.xen.org/xen-devel


_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxx
http://lists.xen.org/xen-devel