Re: scsi-mq V2

From: Jens Axboe
Date: Thu Jul 10 2014 - 09:52:58 EST

On 2014-07-10 15:50, Christoph Hellwig wrote:
On Thu, Jul 10, 2014 at 09:36:09AM -0400, Benjamin LaHaise wrote:
There is one possible concern that could be exacerbated by other changes in
the system: if the application is running close to the bare minimum number
of requests allocated in io_setup(), the per cpu reference counters will
have a hard time batching things. It might be worth testing with an
increased number of requests being allocated if this is the case.

Well, Robert said reverting the two aio commits didn't help. Either he
didn't manage to boot into the right kernel, or we need to look
elsewhere for the culprit.

Rob, let me know what scsi_debug setup you use, and I can try and reproduce it here as well.

Jens Axboe

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