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Re: [Xen-devel] poor domU VBD performance.

from [Keir Fraser]

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To:	Jens Axboe <axboe@xxxxxxx>
Subject:	Re: [Xen-devel] poor domU VBD performance.
From:	Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>
Date:	Thu, 31 Mar 2005 19:57:58 +0100
Cc:	Ian Pratt <m+Ian.Pratt@xxxxxxxxxxxx>, Xen development list <xen-devel@xxxxxxxxxxxxxxxxxxx>, Kurt Garloff <garloff@xxxxxxx>, Philip R Auld <pauld@xxxxxxxxxxx>, Vincent Hanquez <tab@xxxxxxxxx>, Christian Limpach <Christian.Limpach@xxxxxxxxxxxx>
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On 31 Mar 2005, at 19:04, Jens Axboe wrote:

I cannot immediately see if you call bdev_put() right after queueingthe
io? If so, I think the patch looks fine. If not, you are missing the
last unplug :-)

That's not the job of bdev_put(): the final unplug is done at the endof blkio_schedule -- the same place that I do a run_task_queue() whencompling for Linux 2.4.


 Cheers,
 Keir


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