[ath9k-devel] Anyone doing WiFi throughput tests?

[Stephen Donecker <sdonecker@ahmct.ucdavis.edu>]

To all,

Adrian wrote:
> FWIW, FreeBSD was getting 270MBit/sec one-way UDP and 150MBit one-way
> TCP out of AR9160/AR9280's late last year. I should re-run those tests
> again now that I've fixed a bunch of things and see if I've regressed.
> Those are 2T2R devices w/ a Routerstation Pro (AR7161) as the hostap.
>
> At that stage I was maxing out the AR7161 CPU quite badly and filling
> up all kinds of TX/RX paths, to the point that beacon transmission
> stopped being reliable. But I haven't really sat down and run
> performance measurements on MIPS so it's quite possible there's some
> inefficiencies in FreeBSD that I can work around (to reduce the CPU
> overhead, I was happy with the throughput..
>
>
I have been running iperf tests on some AR9160/AR9280's (Ubiquity 
AR9220) on Routerstation's (AR7161) running openwrt. In adhoc mode I am 
getting 100Mbps UDP one-way and 63Mbps TCP one-way. Obviously this is 
quite a difference from Adrian's measurements.

Checking the various /proc/net/ files I discovered that the sender is 
having a lot of SndBufErrors.

Can anyone tell me how to track down the source of these errors/drops? I 
have CONFIG_ATH9K_DEBUG enabled. How can I see into the various 
queues/buffers in the network stack to see where the problem resides? 
Any other advice on tracking down this problem?

Thanks in advance,

-Stephen


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