linux-kernel - Re: Performance degradation in IO writes vs. reads (was scsi-mq V2)

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Date:	Thu, 21 Aug 2014 06:03:15 -0700
From:	Christoph Hellwig <hch@...radead.org>
To:	Sagi Grimberg <sagig@....mellanox.co.il>
Cc:	Christoph Hellwig <hch@...radead.org>,
	James Bottomley <James.Bottomley@...senPartnership.com>,
	Jens Axboe <axboe@...nel.dk>,
	Bart Van Assche <bvanassche@...ionio.com>,
	Robert Elliott <Elliott@...com>, linux-scsi@...r.kernel.org,
	linux-kernel@...r.kernel.org, viro@...IV.linux.org.uk,
	Or Gerlitz <ogerlitz@...lanox.com>,
	Oren Duer <oren@...lanox.com>,
	"Nicholas A. Bellinger" <nab@...ux-iscsi.org>,
	Mike Christie <michaelc@...wisc.edu>,
	linux-fsdevel@...r.kernel.org, Max Gurtovoy <maxg@...lanox.com>
Subject: Re: Performance degradation in IO writes vs. reads (was scsi-mq V2)

On Thu, Aug 21, 2014 at 03:32:09PM +0300, Sagi Grimberg wrote:
> So I just got back to checking this issue of *extremely low* IO write
> performance I got in 3.16-rc2.

Please test with 3.16 final.  There once issue each in aio and dio
that caused bad I/O performance regression that were only fixed last
minute in the 3.16 cycle.

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