linux-kernel - Re: Performance regression in IO scheduler still there

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Message-ID: <20091113074516.GR8742@kernel.dk>
Date:	Fri, 13 Nov 2009 08:45:17 +0100
From:	Jens Axboe <jens.axboe@...cle.com>
To:	Jeff Moyer <jmoyer@...hat.com>
Cc:	Jan Kara <jack@...e.cz>, LKML <linux-kernel@...r.kernel.org>,
	Chris Mason <chris.mason@...cle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Mike Galbraith <efault@....de>, mszeredi@...e.de
Subject: Re: Performance regression in IO scheduler still there

On Thu, Nov 12 2009, Jeff Moyer wrote:
> Jens Axboe <jens.axboe@...cle.com> writes:
> 
> > On Thu, Nov 12 2009, Jeff Moyer wrote:
> >> Good question.  ;-)  I grep for NCQ in dmesg output and make sure it's
> >> greater than 0/32.  There may be a better way, though.
> >
> > cat /sys/block/<dev>/device/queue_depth
> >
> > :-)
> 
> OK, your comment about only working for SCSI disks threw me off.
> Perhaps you meant only works for devices that use the sd driver?

Yeah, only works for storage that plugs into the SCSI stack.

-- 
Jens Axboe

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