Problems with ath at kern.hz=100

[Bengt Ahlgren]

Sam Leffler <sam at freebsd.org> writes:

> Bengt Ahlgren wrote:
>> Sam Leffler <sam at freebsd.org> writes:
>>
>> [...]
>>
>>   
>>> You've removed all the context of the original problem; I can't recall
>>> what you were trying to fix.  The ps q drops might be caused by a bug
>>> that was fixed (I think in RELENG_7).  I don't see what version of
>>> code you're running so can't tell.
>>>     
>>
>> Sorry, a summary of the problem:
>>
>> The system frequently comes into a state where outgoing packets are
>> held somewhere.  The condition persists for seconds to minutes.  It
>> goes away by itself, but some of the packets are usually lost.  This
>> occurs on ath, FreeBSD 7.1-REL, no SMP, with kern.hz=100 (but not with
>> hz=1000).  Original mail with description can be found here:
>>
>> http://lists.freebsd.org/pipermail/freebsd-mobile/2009-February/011343.html
>>
>> I have done some more investigation, inserting debug prints in
>> ath_start (if_ath.c 1.177.2.2.2.1), one just after IFQ_DRV_DEQUEUE
>> (line 1576), another just before the call to ieee80211_pwrsave (line
>> 1614).
>>
>> Packets are dequeued, but ieee80211_pwrsave is called and nothing
>> happens.  Below is the output from "athdebug xmit" with these extra
>> two DPRINTF:s during the queue-up.  Then after a while packets are
>> sent again.
>>
>> Bengt
>>
>>   
> <...debug output removed...>
>
> Did you try RELENG_7? ap mode power save was fixed post 7.1 release.

I can do that, but I am not using ap mode.  Will it still be useful?

Bengt