linux-kernel - Request merging not doing well

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Date:	Wed, 13 Jun 2007 14:56:30 +0300
From:	mcatos@....forth.gr
To:	linux-kernel@...r.kernel.org
Subject: Request merging not doing well

I did some tests to see how requet merging works. Using a dummy ramdisk block
device, I did 'dd count=100 bs=4096 if=/dev/zero of=/dev/foo' (using the
anticipatory scheduler) and in the request function I got 10 requests:

req 1, sector 0, 8 sectors
req 2, sector 8, 8 sectors
.
.
.
req 10, sector 72, 8 sectors

Shouldn'y these requests be merged? Queue default values are: 255 max sectors,
128 max requests.

Thanx.

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