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

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 31 Mar 2005, at 08:10, Jens Axboe wrote:

> Here is a temporary work-around, this should bring you close to 100%
> performance at the cost of some extra unplugs. Uncompiled.
Yep, this does the job for me. Thanks! Avoiding the extra unplugs is 
harder than it sounds as each request in a batch may go to a different 
request queue. To minimise the number of unplugs per batch we'd need to 
add code to remember which queues we had used in the current batch, 
then kick them at the end of the batch. Is there likely to be any 
measurable benefit from reducing the number of unplugs?
 -- Keir


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