From: Dan Williams <dan.j.williams@intel.com>
Date: Tue, 20 Sep 2011 22:10:46 +0000 (-0700)
Subject: [SCSI] libsas: dynamic queue depth
X-Git-Tag: v3.2-rc1~125^2~80
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=97a1420d127ca1db2fd665707bf4e9501758147c;p=pandora-kernel.git

[SCSI] libsas: dynamic queue depth

The queue-depth for libsas-attached devices initializes to 32 and can
only be increased manually via sysfs to a max of 64, while mpt2sas
attached devices initialize to 254 and dynamically float via the
midlayer ->change_queue_depth interface.

No performance regression was observed with this change on the isci
driver.

Tested-by: Dave Jiang <dave.jiang@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
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