From: Marcin Slusarz <marcin.slusarz@gmail.com>
Date: Wed, 9 Mar 2011 13:22:19 +0000 (+0100)
Subject: drm/nouveau: fix __nouveau_fence_wait performance
X-Git-Tag: v2.6.39-rc1~458^2~7^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=bd35fe5a7930bf83ed56422ea4e4b6471ee6f739;p=pandora-kernel.git

drm/nouveau: fix __nouveau_fence_wait performance

Commit 21e86c1c8a844bf978f8fc431a59c9f5a578812d ("drm/nouveau: remove
cpu_writers lock") turned on lazy waits. Unfortunately
__nouveau_fence_wait was not optimized for this case and on HZ=100
kernel wasted up to 10 ms per call.

Depending on application, it led to 10-30% FPS regression.

Fix it.

Signed-off-by: Marcin Slusarz <marcin.slusarz@gmail.com>
Signed-off-by: Francisco Jerez <currojerez@riseup.net>
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