linux-kernel - Re: 2.6.20-rc2+: CFQ halving disk throughput.

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Date:	Tue, 02 Jan 2007 12:35:40 -0500
From:	Mark Lord <lkml@....ca>
To:	Tejun Heo <htejun@...il.com>
Cc:	Jens Axboe <jens.axboe@...cle.com>,
	Rene Herman <rene.herman@...il.com>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	linux-kernel@...r.kernel.org, Linus Torvalds <torvalds@...l.org>
Subject: Re: 2.6.20-rc2+: CFQ halving disk throughput.

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
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