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

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Message-ID: <x49hbszpi7m.fsf@segfault.boston.devel.redhat.com>
Date:	Thu, 12 Nov 2009 16:05:17 -0500
From:	Jeff Moyer <jmoyer@...hat.com>
To:	Jens Axboe <jens.axboe@...cle.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

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?

Cheers,
Jeff
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