Re: [Xen-devel] Xen performance and Dbench

["Todd Deshane" <deshantm@xxxxxxxxx>]

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.

http://www.cl.cam.ac.uk/research/srg/netos/papers/2003-xensosp.pdf
http://web2.clarkson.edu/class/cs644/xen/files/repeatedxen-usenix04.pdf

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

some KVM results for dbench:
http://virt.kernelnewbies.org/KVM/Performance

dbench is an interesting test since it is basically an I/O test (Samba test)
http://samba.org/ftp/tridge/dbench/README

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

Cheers,
Todd


> ===================================
> 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)
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>



-- 
Todd Deshane
http://todddeshane.net
check out our book: http://runningxen.com

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