linux-kernel - Re: scsi-mq V2

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Message-ID: <53BE9AB1.6090603@kernel.dk>
Date:	Thu, 10 Jul 2014 15:52:49 +0200
From:	Jens Axboe <axboe@...nel.dk>
To:	Christoph Hellwig <hch@...radead.org>,
	Benjamin LaHaise <bcrl@...ck.org>
CC:	"Elliott, Robert (Server Storage)" <Elliott@...com>,
	"dgilbert@...erlog.com" <dgilbert@...erlog.com>,
	James Bottomley <James.Bottomley@...senPartnership.com>,
	Bart Van Assche <bvanassche@...ionio.com>,
	"linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: scsi-mq V2

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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