ath0 issue

[Lamont Granquist]

On Wed, 15 Nov 2006, Sam Leffler wrote:
> Snapshots are rarely useful; try running athstats 1 and correlate what
> you see with pauses.  Another possible reason for deferred operation is
> something else in the system blocking the taskq threads; that's a bit
> trickier to diagnose.

I threw in some printf()'s in the beginning of ath_start() and 
ath_tx_proc_q0123() and see this:

Nov 28 20:27:41 warez kernel: ath_tx_proc_q0123: 1
Nov 28 20:27:41 warez kernel: ath_start
Nov 28 20:27:41 warez kernel: ath_start
Nov 28 20:27:41 warez kernel: ath_tx_proc_q0123: 1
Nov 28 20:27:41 warez kernel: ath_start
Nov 28 20:27:45 warez last message repeated 13 times
Nov 28 20:27:45 warez kernel: ath_tx_proc_q0123: 1
Nov 28 20:27:45 warez kernel: ath_start
Nov 28 20:27:45 warez kernel: ath_tx_proc_q0123: 1
Nov 28 20:27:45 warez kernel: ath_start
Nov 28 20:27:45 warez kernel: ath_start

this was during a time where i was pinging across this interface so that 
every second it should have been transmitting at least one packet.  the 4 
second stutter there where ath_tx_proc_q0123 wasn't being called 
correllates with actual stutters in packet transmission.

if i understand this, that's the taskq associated with transmission?

TASK_INIT(&sc->sc_txtask, 0, ath_tx_proc_q0123, sc);