linux-kernel - Re: [RFC][PATCH 3/3] Do not use rqhash when merges disabled

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Message-ID: <480FEB4A.7090905@gelato.unsw.edu.au>
Date:	Thu, 24 Apr 2008 12:07:06 +1000
From:	Aaron Carroll <aaronc@...ato.unsw.edu.au>
To:	"Alan D. Brunelle" <Alan.Brunelle@...com>
CC:	linux-kernel@...r.kernel.org, Jens Axboe <jens.axboe@...cle.com>
Subject: Re: [RFC][PATCH 3/3] Do not use rqhash when merges disabled

Alan D. Brunelle wrote:
> Good catch - that was a last minute addition, the ELV_ON_HASH should be
> sufficient without the check for blk_queue_nomerges, right?

Yes.  With that line reverted it seems to work fine.  FWIW, I'm testing
it like so:

=================================x8=======================================

#!/bin/bash

DEV=sdb

echo deadline > /sys/block/${DEV}/queue/scheduler

~/bin-ia64/fio - <<! &
[reader]
filename=/dev/${DEV}
ioengine=sync
direct=1
norandommap
randrepeat=0
zero_buffers
bs=16k
rw=randread:16
numjobs=128
time_based
runtime=600
!

while /bin/true ; do
	echo 0 > /sys/block/${DEV}/queue/nomerges
	sleep 0.1
	echo 1 > /sys/block/${DEV}/queue/nomerges
	sleep 0.1
done
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