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Re: [Xen-devel] Xen performance and Dbench

To: "dan.magenheimer@xxxxxxxxxx" <dan.magenheimer@xxxxxxxxxx>
Subject: Re: [Xen-devel] Xen performance and Dbench
From: "Todd Deshane" <deshantm@xxxxxxxxx>
Date: Thu, 7 Aug 2008 15:10:48 -0400
Cc: "Xen-Devel \(E-mail\)" <xen-devel@xxxxxxxxxxxxxxxxxxx>
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On Thu, Aug 7, 2008 at 1:18 PM, Dan Magenheimer
<dan.magenheimer@xxxxxxxxxx> wrote:
> I saw the presentation "Virtualization of Linux Servers" at
> OLS last month and it had some nice comparisons of Xen
> performance vs a lot of other virtualization/container
> technologies:
> http://ols.fedoraproject.org/OLS/Reprints-2008/camargos-reprint.pdf

Thanks for pointing this one out.

> As always with benchmarks, there are questions to ask and
> points to quibble, but overall Xen looks quite good...
> except on Dbench.  Has anybody else run this benchmark
> on Xen and gotten better results?  If not, any thoughts
> on why Xen (and all virt solutions) would do poorly on this
> benchmark?  And whether Xen can/should be fixed?

The original Xen paper [1] and our repeated research paper [2]
showed a decent dbench "score" vs. native.


dbench is known to have a high standard deviation...

some KVM results for dbench:

dbench is an interesting test since it is basically an I/O test (Samba test)

I don't know if dbench is the best test to determine if Xen (or other
virts) need
to be fixed.


> ===================================
> Thanks... for the memory
> I really could use more / My throughput's on the floor
> The balloon is flat / My swap disk's fat / I've OOM's in store
> Overcommitted so much
> (with apologies to the late great Bob Hope)
> _______________________________________________
> Xen-devel mailing list
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> http://lists.xensource.com/xen-devel

Todd Deshane
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