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Re: [ath5k-devel] How to profile this strange effect under high load?

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2010/10/12 Bruno Randolf <br1@xxxxxxxxxxx>:
> Hello!
>
> I am trying to debug a strange effect, I am seeing on soekris net48xx boards
> with two ath5k interfaces:
>
> Â* wlan0 [phy0] configured in ad-hoc mode, A band, and it is getting a lot of
> traffic routed thru it
> Â* wlan1 [phy1] also configured in ad-hoc mode, G band, but not actively
> sending (no IP address).
>
> I run iperf between two PCs attached by ethernet, UDP 25Mbps and I am sure all
> traffic is routed thru wlan0 (phy0). The load on the SENDING box gets very
> high:
>
> Mem: 27304K used, 99040K free, 0K shrd, 616K buff, 14128K cached
> CPU:  0% usr  0% sys  0% nic  0% idle  0% io  5% irq Â93% sirq
> Load average: 1.73 1.01 2.23 2/38 3128
> ÂPID ÂPPID USER Â Â STAT Â VSZ %MEM %CPU COMMAND
> Â2772   2 root   RW    0  0% Â71% [phy1]
> Â2757   2 root   SW    0  0% Â11% [phy0]
> Â3128  436 root   R   Â988  1%  8% top
>  Â3   2 root   SW    0  0%  5% [ksoftirqd/0]
>  Â5   2 root   SW    0  0%  3% [events/0]
>  56   2 root   SW    0  0%  1% [bdi-default]
> Â1383   1 root   S   1824  1%  0% /usr/bin/oprofiled --session-dir=/r
>
> ...and the interesting thing is that [phy1] - the INACTIVE interface -
> consumes much more CPU time than [phy0] which is actually transmitting.
>
> I have disabled ANI on wlan1, to avoid getting many MIB interrupts, but it
> does not change much.
>
> I have dumped frames on phy1, and all it sees are a few beacon frames.
>
> I have tried wlan1 in managed mode - same effect. The effect is slightly less
> in AP mode, though...
>
> I tried oprofile, but it shows mostly tx related things.
>
> So my question is: How can I find out, what [phy1] is so busy doing? Any ideas
> how to profile this?
>
> Thanks in advance,
> bruno
>

When ph1 is also connected consumes more or less CPU ? What happens If
you just give it an IP address ?


-- 
GPG ID: 0xD21DB2DB
As you read this post global entropy rises. Have Fun ;-)
Nick
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