[PATCH] powerpc/cell spidernet reduce DMA kicking

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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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Linas Vepstas 2006-10-10 16:18:18 -05:00 • committed by Jeff Garzik

parent 499eea1872

commit a664ccf430

1 changed files with 13 additions and 6 deletions

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19

drivers/net/spider_net.c

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