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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 16:13:37 -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 22:13:46 +0000 |
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On Thursday 31 March 2005 15:32, Ian Pratt wrote:
> > Could you try again, but replace calls to
> >
> > blk_run_queue(plugged_queue) in blkback.c with:
> > if ( plugged_queue->unplug_fn )
> > plugged_queue->unplug_fn(plugged_queue);
> >
> > This looks like a better match with what various other
> > drivers do (e.g.
> > swraid).
OK, changes worked for me, but still have some min latency here (but
much better)
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
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