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 13:10:36 -0500 [thread overview]
Message-ID: <459AA01C.9090806@rtr.ca> (raw)
In-Reply-To: <459A9C30.20204@gmail.com>
Tejun Heo wrote:
> Mark Lord wrote:
>
>>> 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.
Sure it does.
Try "strace hdparm -I /dev/sr0" and notice the two ioctl() calls.
The problem is that libata/SCSI always fail it for some reason.
Ditto for me right now when I tried it with an SG_IO passthru command.
Contrary to my other posting, I actually *do* have a libata-controlled
DVD/RW drive in my box here. So I'll try and see what's happening.
Still digging..
next prev parent reply other threads:[~2007-01-02 18:10 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 [this message]
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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