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Date:	Sun, 24 Aug 2014 19:41:57 +0300
From:	Sagi Grimberg <>
To:	Christoph Hellwig <>
CC:	James Bottomley <>,
	Jens Axboe <>,
	Bart Van Assche <>,
	Robert Elliott <>,,,,
	Or Gerlitz <>,
	Oren Duer <>,
	"Nicholas A. Bellinger" <>,
	Mike Christie <>,, Max Gurtovoy <>
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.

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