From: Rik van Riel <riel@redhat.com>
To: ehrhardt@linux.vnet.ibm.com
Cc: linux-mm@kvack.org, axboe@kernel.dk
Subject: Re: [PATCH 1/2] swap: allow swap readahead to be merged
Date: Tue, 15 May 2012 13:43:33 -0400 [thread overview]
Message-ID: <4FB295C5.7080008@redhat.com> (raw)
In-Reply-To: <1336996709-8304-2-git-send-email-ehrhardt@linux.vnet.ibm.com>
On 05/14/2012 07:58 AM, ehrhardt@linux.vnet.ibm.com wrote:
> From: Christian Ehrhardt<ehrhardt@linux.vnet.ibm.com>
>
> Swap readahead works fine, but the I/O to disk is almost always done in page
> size requests, despite the fact that readahead submits 1<<page-cluster pages
> at a time.
> On older kernels the old per device plugging behavior might have captured
> this and merged the requests, but currently all comes down to much more I/Os
> than required.
>
> On a single device this might not be an issue, but as soon as a server runs
> on shared san resources savin I/Os not only improves swapin throughput but
> also provides a lower resource utilization.
> Signed-off-by: Christian Ehrhardt<ehrhardt@linux.vnet.ibm.com>
Acked-by: Rik van Riel <riel@redhat.com>
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next prev parent reply other threads:[~2012-05-15 17:43 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-05-14 11:58 [PATCH 0/2] swap: improve swap I/O rate ehrhardt
2012-05-14 11:58 ` [PATCH 1/2] swap: allow swap readahead to be merged ehrhardt
2012-05-15 4:38 ` Minchan Kim
2012-05-15 17:43 ` Rik van Riel [this message]
2012-05-14 11:58 ` [PATCH 2/2] documentation: update how page-cluster affects swap I/O ehrhardt
2012-05-15 4:48 ` Minchan Kim
2012-05-21 7:24 ` Christian Ehrhardt
2012-05-15 4:59 ` [PATCH 0/2] swap: improve swap I/O rate Minchan Kim
2012-05-21 7:51 ` Christian Ehrhardt
2012-05-21 8:46 ` Minchan Kim
2012-05-15 18:24 ` Jens Axboe
-- strict thread matches above, loose matches on Subject: below --
2012-05-21 8:09 [PATCH 0/2] swap: improve swap I/O rate - V2 ehrhardt
2012-05-21 8:09 ` [PATCH 1/2] swap: allow swap readahead to be merged ehrhardt
2012-05-21 8:51 ` Minchan Kim
2012-05-21 9:07 ` Christian Ehrhardt
2012-06-04 8:33 [PATCH 0/2] swap: improve swap I/O rate - V2 ehrhardt
2012-06-04 8:33 ` [PATCH 1/2] swap: allow swap readahead to be merged ehrhardt
2012-06-05 23:44 ` Andrew Morton
2012-06-20 15:58 ` Christian Ehrhardt
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