linux-kernel - Re: scsi-mq V2

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Date:	Wed, 9 Jul 2014 23:20:40 -0700
From:	Christoph Hellwig <hch@...radead.org>
To:	"Elliott, Robert (Server Storage)" <Elliott@...com>
Cc:	Jens Axboe <axboe@...nel.dk>,
	"dgilbert@...erlog.com" <dgilbert@...erlog.com>,
	Christoph Hellwig <hch@...radead.org>,
	James Bottomley <James.Bottomley@...senPartnership.com>,
	Bart Van Assche <bvanassche@...ionio.com>,
	Benjamin LaHaise <bcrl@...ck.org>,
	"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 Thu, Jul 10, 2014 at 12:53:36AM +0000, Elliott, Robert (Server Storage) wrote:
> the problem still occurs - fio results in low or 0 IOPS, with perf top 
> reporting unusual amounts of time spent in do_io_submit and io_submit.

The diff between the two version doesn't show too much other possible
interesting commits, the most interesting being some minor block
updates.

I guess we'll have to a manual bisect, I've pushed out a
scsi-mq.3-bisect-1 branch that is rebased to just before the merge of
the block tree, and a scsi-mq.3-bisect-2 branch that is just after
the merge of the block tree to get started.

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