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

[Aaron Carroll]

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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