From: Vu Pham <vu@mellanox.com>
Date: Mon, 11 Nov 2013 17:04:29 +0000 (+0200)
Subject: iser-target: Avoid using FRMR for single dma entry requests
X-Git-Tag: v3.13-rc1~5^2~19
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f01b9f73392b48c6cda7c2c66594c73137c776da;p=pandora-kernel.git

iser-target: Avoid using FRMR for single dma entry requests

This patch changes isert_reg_rdma_frwr() to not use FRMR for single
dma entry requests from small I/Os, in order to avoid the associated
memory registration overhead.

Using DMA MR is sufficient here for the single dma entry requests,
and addresses a >= v3.12 performance regression.

Signed-off-by: Vu Pham <vu@mellanox.com>
Cc: <stable@vger.kernel.org> # v3.12+
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
---

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