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

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Message-ID: <53FA15D5.1030206@dev.mellanox.co.il>
Date:	Sun, 24 Aug 2014 19:41:57 +0300
From:	Sagi Grimberg <sagig@....mellanox.co.il>
To:	Christoph Hellwig <hch@...radead.org>
CC:	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 8/21/2014 5:02 PM, Sagi Grimberg wrote:
> On 8/21/2014 4:03 PM, Christoph Hellwig wrote:
>> 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.
>>
>
> I'll do that now.
>

Indeed this issue is resolved in 3.16. Sorry for the false alarm...
Thanks Christoph.

Sagi.
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