Re: High CPU utilization of hostap

From: Jouni Malinen (
Date: 2002-04-30 19:27:46 UTC

On Tue, Apr 30, 2002 at 12:06:02PM -0700, Happy Camper wrote:

> Using this technique I do see a 10% improvement in CPU utilization on
> average. But the avg. CPU utilization of 25% on a P4 2GHz is still a
> cause for concern. Could this mean a potential 100% CPU utilization
> on a P3 500MHz?

Not likely--CPU time is most probably spent (busy) waiting something and 25% of CPU time would be used regardless of the CPU speed. Anyway, this is of course not very nice and I have to take a closer look at it.

I think I have seen much smaller loads with latest versions of the driver, but I haven't checked the situation with hostap_pci. However, I have successfully used it with two Prism2.5 cards on Pentium Pro 200 MHz and with one card on Pentium 166 MHz while using full bandwidth. Both of these computers had plenty of CPU to spare even during high wlan load.

Jouni Malinen                                            PGP id EFC895FA

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