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xen-devel
Re: [Xen-devel] poor domU VBD performance.
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To: |
"Ian Pratt" <m+Ian.Pratt@xxxxxxxxxxxx>, "Keir Fraser" <Keir.Fraser@xxxxxxxxxxxx> |
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Subject: |
Re: [Xen-devel] poor domU VBD performance. |
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From: |
Andrew Theurer <habanero@xxxxxxxxxx> |
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Date: |
Thu, 31 Mar 2005 17:05:35 -0600 |
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Cc: |
Xen development list <xen-devel@xxxxxxxxxxxxxxxxxxx>, Kurt Garloff <garloff@xxxxxxx>, Philip R Auld <pauld@xxxxxxxxxxx>, Vincent Hanquez <tab@xxxxxxxxx>, Jens Axboe <axboe@xxxxxxx>, Christian Limpach <Christian.Limpach@xxxxxxxxxxxx> |
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Thu, 31 Mar 2005 23:05:43 +0000 |
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On Thursday 31 March 2005 16:36, Ian Pratt wrote:
> > reqsze MB/sec svcmt
> >
> > xenU 16k 6266.67 1.25
> > 32k 12618.67 1.20
> > 64k 25002.67 1.28
> > 128k 49322.67 1.35
> > 256k 58538.67 3.15
> >
> > xen0 16k 13818.67 1.15
> > 32k 27573.33 1.16
> > 64k 54784.00 1.16
> > 128k 58581.33 2.18
> > 256k 58453.33 4.38
> >
> > noXen 16k 58679.19 0.27
> > 32k 58453.33 0.54
> > 64k 58713.04 1.08
> > 128k 58174.09 2.17
> > 256k 58820.07 4.36
>
> These figures for xen0 are interesting. It's odd that we tail off so
> badly for short requests. What interrupt rates are occuring when you
> do these tests?
I just ran again, and for some reason it looks fine now... I have no
idea what I did to get the lower numbers initially, perhaps an
inadvertant IO scheduler change. Service commit times are .28ms and I
can drive ~58MB/sec with just 16k requests on xen0. I'll do some more
tests to get a more consistent picture.
-Andrew
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