From: Linas Vepstas <linas@austin.ibm.com>
Date: Tue, 10 Oct 2006 21:18:18 +0000 (-0500)
Subject: [PATCH] powerpc/cell spidernet reduce DMA kicking
X-Git-Tag: v2.6.19-rc2~23^2~10
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a664ccf430547696951bf3949f5a2de5079ece5a;p=pandora-kernel.git

[PATCH] powerpc/cell spidernet reduce DMA kicking

The current code attempts to start the TX dma every time a packet
is queued. This is too conservative, and wastes CPU time. This
patch changes behaviour to call the kick-dma function less often,
only when the tx queue is at risk of emptying.

This reduces cpu usage, improves performance.

Signed-off-by: Linas Vepstas <linas@austin.ibm.com>
Cc: James K Lewis <jklewis@us.ibm.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
---

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