linux-kernel - RE: scsi-mq V2

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Message-ID: <94D0CD8314A33A4D9D801C0FE68B402958B96E3B@G9W0745.americas.hpqcorp.net>
Date:	Thu, 10 Jul 2014 15:51:44 +0000
From:	"Elliott, Robert (Server Storage)" <Elliott@...com>
To:	Christoph Hellwig <hch@...radead.org>
CC:	Jens Axboe <axboe@...nel.dk>,
	"dgilbert@...erlog.com" <dgilbert@...erlog.com>,
	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



> -----Original Message-----
> From: Christoph Hellwig [mailto:hch@...radead.org]
> Sent: Thursday, 10 July, 2014 1:21 AM
> To: Elliott, Robert (Server Storage)
> Cc: Jens Axboe; dgilbert@...erlog.com; Christoph Hellwig; James Bottomley;
> Bart Van Assche; Benjamin LaHaise; linux-scsi@...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

good.

> and a scsi-mq.3-bisect-2 branch that is just after the merge of the 
> block tree to get started.

good.


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