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From: Jan Engelhardt <jengelh@linux01.gwdg.de>
To: Mark Lord <lkml@rtr.ca>
Cc: Jens Axboe <jens.axboe@oracle.com>,
	Rene Herman <rene.herman@gmail.com>, Tejun Heo <htejun@gmail.com>,
	Alan Cox <alan@lxorguk.ukuu.org.uk>,
	linux-kernel@vger.kernel.org, Linus Torvalds <torvalds@osdl.org>
Subject: Re: 2.6.20-rc2+: CFQ halving disk throughput.
Date: Tue, 2 Jan 2007 18:09:17 +0100 (MET)	[thread overview]
Message-ID: <Pine.LNX.4.61.0701021807500.4001@yvahk01.tjqt.qr> (raw)
In-Reply-To: <459A73CB.8010901@rtr.ca>


On Jan 2 2007 10:01, Mark Lord wrote:
> Jens Axboe wrote:
>> 
>> > But surely one of (not sure which) sync+async or async+sync may also
>> > be okay?
>> > Or would it?
>> 
>> Async merge to sync request should be ok. But I wonder what happens with
>> hdparm, since it seems to trigger one of these tests. Very puzzling.
>> I'll dive in and take a look.
>
> The code (written 10 years ago) isn't the best in the world,
> and will be redone entirely for hdparm-7.0 this year.
>
> But right now, it essentially does this:
>
> loop:
> seek( to sector zero );
> read( 2MBytes );
> repeat loop for 3 seconds

Well for pure reading speed, I already use  dd_rescue -d /dev/hda /dev/null
Gives the same as hdparm -t when acting on uncached data.


	-`J'
-- 

  parent reply	other threads:[~2007-01-02 17:14 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2006-12-20 13:37 PATA -- pata_amd on 2.6.19 fails to IDENTIFY my DVD-ROM Rene Herman
2006-12-27  7:19 ` Tejun Heo
2006-12-27 17:50   ` Rene Herman
2006-12-28  2:24     ` Tejun Heo
2007-01-01 22:46       ` 2.6.20-rc2+: CFQ halving disk throughput Rene Herman
2007-01-01 22:56         ` Rene Herman
2007-01-01 23:30           ` Linus Torvalds
2007-01-01 23:28         ` Mark Lord
2007-01-02  8:34           ` Jens Axboe
2007-01-02 15:01             ` Mark Lord
2007-01-02 16:53               ` Tejun Heo
2007-01-02 17:35                 ` Mark Lord
2007-01-02 17:53                   ` Tejun Heo
2007-01-02 18:10                     ` Mark Lord
2007-01-02 21:50                     ` ATA_12 support for libata/ATAPI devices Mark Lord
2007-01-02 17:09               ` Jan Engelhardt [this message]
2007-01-02  5:36         ` 2.6.20-rc2+: CFQ halving disk throughput Andrew Morton
2007-01-02  8:44           ` Jens Axboe
2007-01-02 10:24             ` Rene Herman
2007-01-02 11:57               ` Jens Axboe
2007-01-02 12:10                 ` Jens Axboe
2007-01-02 15:12                   ` Mark Lord
2007-01-02 15:14                     ` Jens Axboe
2007-01-02 15:40                       ` Mark Lord
2007-01-02 15:45                         ` Jens Axboe

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