2011/6/22 jpo <pommn...@yahoo.com>:
> Hello all,
> there seems to be a significant performance loss when moving from Madwifi
> to ath5k. For an embedded project we have been using Madwifi with Linux kernel
> 2.6.23. We have tested ath5k for some time and by now it seems to be stable
> enough for production use. Unfortunately it doesn't match Madwifi's
> performance.
> Running iperf (both, UDP and TCP) between two machines equipped with an AR5413
> with the Fedora 15 kernel and the stock Fedora 15 wireless subsystem shows a
> performance loss of about 10% relative to 2.6.23 and Madwifi-0.9.4.
> The tests where done under close to ideal lab conditions (cards connected with
> an antenna cable) running an IBSS network on channel 40 (5200MHz).
>
> Can anybody confirm this observation?
> Is there an explanation?
> Are there some tuning knobs I could try to improve the performance with
> mac80211/ath5k?
> Is the problem outside the wireless subsystem (Maybe it's the TCP/IP stack or
> something Fedora specific)?
>
> Thanks in advance.
> Joerg
>
I can confirm the performance loss. I tested three madwifi versions
with open hal and the openwrt binary hal version.
ath5k has worst performance. Simple ftp file transfer was used as a
test. And I used AP - station case. ath5k as AP, ath9k as station.
Results are:
~2.7 Mb/s for open hal madwifi
>3 Mb/s for binary hal madwifi
<2 Mb/s for ath5k
If I have some time, I will help to investigate the problem.
--
Best regards, Nikolay Ledovskikh.
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