Problems with ath at kern.hz=100

[Sam Leffler]

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.

Sam