From: Yi Zou <yi.zou@intel.com>
Date: Tue, 25 Aug 2009 20:59:03 +0000 (-0700)
Subject: [SCSI] fcoe: Add sysfs parameter to fcoe for minimum DDP read I/O size
X-Git-Tag: v2.6.32-rc1~689^2~79
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=05cc7390735c49357b9ae67bf97f1c1579547f5b;p=pandora-kernel.git

[SCSI] fcoe: Add sysfs parameter to fcoe for minimum DDP read I/O size

This adds fcoe_ddp_min as a module parameter for fcoe module to:
/sys/module/fcoe/parameters/ddp_min

It is observed that for some hardware, particularly Intel 82599, there is too
much overhead in setting up context for direct data placement (DDP) read when
the requested read I/O size is small. This is added as a module parameter for
performance tuning and is set as 0 by default and user can change this based
on their own hardware.

Signed-off-by: Yi Zou <yi.zou@intel.com>
Signed-off-by: Robert Love <robert.w.love@intel.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
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