From: Tejun Heo <htejun@gmail.com>
To: Mark Lord <lkml@rtr.ca>
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: Wed, 03 Jan 2007 02:53:52 +0900 [thread overview]
Message-ID: <459A9C30.20204@gmail.com> (raw)
In-Reply-To: <459A97EC.8090903@rtr.ca>
Mark Lord wrote:
> 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.
No objection there.
> 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?
Just implemented and posted patch for HDIO_GET_IDENTITY in an attempt to
access ATAPI IDENTIFY block using hdparm.
>> 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.
Hmmm... My hdparm doesn't seem to do that.
# hdparm -V
hdparm v6.9
# hdparm -I /dev/sr0
/dev/sr0:
HDIO_DRIVE_CMD(identify) failed: Input/output error
Am I missing something?
> In hdparm-7.0, I'll have it use ATA passthrough when possible
> for most/all commands.
Glad to hear.
Happy new year.
--
tejun
next prev parent reply other threads:[~2007-01-02 17:54 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 [this message]
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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