From: Anton Blanchard <anton@samba.org>
Date: Sun, 3 Jun 2012 19:43:44 +0000 (+0000)
Subject: powerpc/iommu: Reduce spinlock coverage in iommu_free
X-Git-Tag: v3.6-rc1~132^2~54
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=67ca141567519a6b0ec81850a7b6569b6d8c2b52;p=pandora-kernel.git

powerpc/iommu: Reduce spinlock coverage in iommu_free

This patch moves tce_free outside of the lock in iommu_free.

Some performance numbers were obtained with a Chelsio T3 adapter on
two POWER7 boxes, running a 100 session TCP round robin test.

Performance improved 25% with this patch applied.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
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