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Date: Fri, 13 Nov 2009 08:45:17 +0100
From: Jens Axboe <jens.axboe@oracle.com>
To: Jeff Moyer <jmoyer@redhat.com>
Cc: Jan Kara <jack@suse.cz>, LKML <linux-kernel@vger.kernel.org>,
       Chris Mason <chris.mason@oracle.com>,
       Andrew Morton <akpm@linux-foundation.org>,
       Mike Galbraith <efault@gmx.de>, mszeredi@suse.de
Subject: Re: Performance regression in IO scheduler still there
Message-ID: <20091113074516.GR8742@kernel.dk>
References: <20091026172012.GC7233@duck.suse.cz> <x49zl7020mr.fsf@segfault.boston.devel.redhat.com> <20091111141031.GA21511@duck.suse.cz> <x493a4lot31.fsf@segfault.boston.devel.redhat.com> <20091112172941.GK14528@duck.suse.cz> <x49pr7npj71.fsf@segfault.boston.devel.redhat.com> <20091112210000.GO8742@kernel.dk> <x49hbszpi7m.fsf@segfault.boston.devel.redhat.com>
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On Thu, Nov 12 2009, Jeff Moyer wrote:
> Jens Axboe <jens.axboe@oracle.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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