Re: [PATCH 1/2] swap: allow swap readahead to be merged

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On 05/14/2012 07:58 AM, ehrhardt@xxxxxxxxxxxxxxxxxx wrote:
From: Christian Ehrhardt<ehrhardt@xxxxxxxxxxxxxxxxxx>

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@xxxxxxxxxxxxxxxxxx>

Acked-by: Rik van Riel <riel@xxxxxxxxxx>

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