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Re: [Xen-devel] Poor performance on HVM (kernbench)

To: Todd Deshane <deshantm@xxxxxxxxx>
Subject: Re: [Xen-devel] Poor performance on HVM (kernbench)
From: Pasi Kärkkäinen <pasik@xxxxxx>
Date: Thu, 11 Sep 2008 09:31:49 +0300
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On Wed, Sep 10, 2008 at 02:23:17PM -0400, Todd Deshane wrote:
> Hi All,
> We are continuing our Xen vs. KVM benchmarking that I presented at Xen summit.
> This time, we are focusing on newer versions and also planning to
> include Xen HVM
> and KVM with PV drivers results. As well as adding some more tests.
> I have setup Xen 3.3 from source, and am using Linux 2.6.27-rc4 for
> all the guests.
> Below are some raw kernbench results, which clearly show that I have a problem
> with Xen HVM. It may just be a configuration issue, but we have tried
> all that we could think of so far (i.e file:, instead of tap:aio). 

You could also try "phy:" and use raw devices or LVM volumes.. I think this
should be the best performing method? 

Then again I'm pretty sure changing that doesn't explain/change your (bad) HVM 

-- Pasi

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