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From: Mark Lord <lkml@rtr.ca>
To: Tejun Heo <htejun@gmail.com>
Cc: Jens Axboe <jens.axboe@oracle.com>,
	Rene Herman <rene.herman@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, 02 Jan 2007 12:35:40 -0500	[thread overview]
Message-ID: <459A97EC.8090903@rtr.ca> (raw)
In-Reply-To: <459A8E17.80601@gmail.com>

Tejun Heo wrote:
>
> OT but care to make -i and -I work equivalently?  Such that -i reports
> more detailed info and user can dump stored id block.

hdparm -I works just fine now.

hdparm -i requires the HDIO_GET_IDENTITY ioctl() from drivers/ide,
to retrieve the "boot time" copy of the identify block, before any
mods are made by the driver.  But in recent years, drivers/ide has
broken it, in that it tries to maintain the "boot time" copy in sync
with the on-drive copy.  Kinda makes -i pointless.

Is there a way to retrieve the libata cached copy of the ID block?
How?

>Support for IDENTIFY PACKET DEVICE would be nice too.

It already does that, using HDIO_DRIVE_CMD to retrieve it
in the same way as for regular IDENTIFY DEVICE commands.

In hdparm-7.0, I'll have it use ATA passthrough when possible
for most/all commands.

Cheers

  reply	other threads:[~2007-01-02 17:35 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 [this message]
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               ` 2.6.20-rc2+: CFQ halving disk throughput Jan Engelhardt
2007-01-02  5:36         ` 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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