From mboxrd@z Thu Jan  1 00:00:00 1970
From: Sagi Grimberg <sagig@dev.mellanox.co.il>
Subject: Re: Performance degradation in IO writes vs. reads (was scsi-mq V2)
Date: Thu, 21 Aug 2014 17:02:32 +0300
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To: Christoph Hellwig <hch@infradead.org>
Cc: James Bottomley <James.Bottomley@HansenPartnership.com>, Jens Axboe <axboe@kernel.dk>, Bart Van Assche <bvanassche@fusionio.com>, Robert Elliott <Elliott@hp.com>, linux-scsi@vger.kernel.org, linux-kernel@vger.kernel.org, viro@ZenIV.linux.org.uk, Or Gerlitz <ogerlitz@mellanox.com>, Oren Duer <oren@mellanox.com>, "Nicholas A. Bellinger" <nab@linux-iscsi.org>, Mike Christie <michaelc@cs.wisc.edu>, linux-fsdevel@vger.kernel.org, Max Gurtovoy <maxg@mellanox.com>
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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.

Thanks,
Sagi.