linux-kernel - Re: 2.6.20-rc3 regression? hdparm shows 1/2...1/3 the throughput

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Message-ID: <459FFE95.1020403@s5r6.in-berlin.de>
Date:	Sat, 06 Jan 2007 20:55:01 +0100
From:	Stefan Richter <stefanr@...6.in-berlin.de>
To:	Tim Schmielau <tim@...sik3.uni-rostock.de>
CC:	linux-kernel@...r.kernel.org
Subject: Re: 2.6.20-rc3 regression?  hdparm shows 1/2...1/3 the throughput

Tim Schmielau wrote:
> On Sat, 6 Jan 2007, Stefan Richter wrote:
> 
>> Did anybody else notice this?  The result of "hdparm -t" under 2.6.20-rc
>> seems to be less than half of what you get on 2.6.19.  However, disk I/O
>> did *not* get slower according to bonnie++.
> 
> yes. See
>   http://lkml.org/lkml/2007/1/2/75
> for the solution.
> 
> Tim

Thanks. I should have remembered that.

# hdparm -tT /dev/hda

/dev/hda:
 Timing cached reads:   10864 MB in  2.00 seconds = 5440.10 MB/sec
 Timing buffered disk reads:   58 MB in  3.06 seconds =  18.94 MB/sec
# cat /sys/block/hda/queue/scheduler
noop anticipatory deadline [cfq]
# echo anticipatory > /sys/block/hda/queue/scheduler
# hdparm -tT /dev/hda

/dev/hda:
 Timing cached reads:   10680 MB in  2.00 seconds = 5347.20 MB/sec
 Timing buffered disk reads:  148 MB in  3.02 seconds =  49.03 MB/sec

-- 
Stefan Richter
-=====-=-=== ---= --==-
http://arcgraph.de/sr/
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