HELP: my wireless card consumes too much CPU

Jouni Malinen jkmaline at cc.hut.fi
Mon Feb 3 20:54:37 EST 2003


On Mon, Feb 03, 2003 at 01:33:04PM +0100, Christian Zoffoli wrote:

> I've two machines using hostap (the first one in Master mode and the 
> second one in managed mode). When I start the videolan server (VLS) on 
> the machine acting as an AP the CPU of the client machine has an 
> occupation between 40-75% (VIA EPIA 800) ...without starting the 
> videolan client (VLC) !.

> How could I lower the CPU occupation on the client side ?

By replacing Prism2 based cards with something that supports DMA..

40-75% sounds a bit much, though. I remember seeing about 30-40% use
when flooding one Prism2 card with about 6 Mbps stream. Driver code
could probably be optimized a bit, but I don't think it is going to help
much since most host-CPU time is spent waiting for I/O to/from the
Prism2 card.

-- 
Jouni Malinen                                            PGP id EFC895FA



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