From mboxrd@z Thu Jan  1 00:00:00 1970
From: 'Christoph Hellwig' <hch@infradead.org>
Subject: Re: [PATCH 1/3] libsas: sas_queuecommand doesnt need host_lock
Date: Fri, 22 Jul 2011 22:05:15 -0400
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To: Jack Wang <jack_wang@usish.com>
Cc: 'Dan Williams' <dan.j.williams@intel.com>, 'Christoph Hellwig' <hch@infradead.org>, James.Bottomley@hansenpartnership.com, linux-scsi@vger.kernel.org, "'dave.jiang'" <dave.jiang@intel.com>

On Tue, Jul 19, 2011 at 04:56:22PM +0800, Jack Wang wrote:
> [Jack Wang] 
> I test it with pm8001, using 512b read with 12 6G sas disks bumps ~460K iops
> from 340K iops, but using 512b write performance drops from 340K to 240K.

Very strange.  Is this repeatable, and did you test with just patch 1,
or the whole series?