linux-kernel - Re: [RFC 0/3] reduce latency of direct async compaction

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Message-ID: <56600DAA.4050208@suse.cz>
Date:	Thu, 3 Dec 2015 10:38:50 +0100
From:	Vlastimil Babka <vbabka@...e.cz>
To:	Aaron Lu <aaron.lu@...el.com>
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Rik van Riel <riel@...hat.com>,
	David Rientjes <rientjes@...gle.com>,
	Mel Gorman <mgorman@...e.de>, Minchan Kim <minchan@...nel.org>
Subject: Re: [RFC 0/3] reduce latency of direct async compaction

On 12/03/2015 10:25 AM, Aaron Lu wrote:
> On Thu, Dec 03, 2015 at 09:10:44AM +0100, Vlastimil Babka wrote:
>> Aaron, could you try this on your testcase?
> 
> The test result is placed at:
> https://drive.google.com/file/d/0B49uX3igf4K4enBkdVFScXhFM0U
> 
> For some reason, the patches made the performace worse. The base tree is
> today's Linus git 25364a9e54fb8296837061bf684b76d20eec01fb, and its
> performace is about 1000MB/s. After applying this patch series, the
> performace drops to 720MB/s.
> 
> Please let me know if you need more information, thanks.

Hm, compaction stats are at 0. The code in the patches isn't even running.
Can you provide the same data also for the base tree?

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