Date: Wed, 29 Nov 2006 08:53:44 -0800 From: Sam Leffler <sam@errno.com> To: Lamont Granquist <lamont@scriptkiddie.org> Cc: freebsd-stable@freebsd.org Subject: Re: ath0 issue Message-ID: <456DBB18.3090603@errno.com> In-Reply-To: <Pine.GSO.4.60.0611282038060.6773@sploit.scriptkiddie.org> References: <Pine.GSO.4.60.0611112035320.27030@sploit.scriptkiddie.org> <Pine.GSO.4.60.0611121126390.29168@sploit.scriptkiddie.org> <45578B48.1090704@errno.com> <Pine.GSO.4.60.0611121455590.29754@sploit.scriptkiddie.org> <455BD2BF.3050802@errno.com> <Pine.GSO.4.60.0611282038060.6773@sploit.scriptkiddie.org>
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Lamont Granquist wrote: > > > 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); > > No, that's the task q that reaps completed tx descriptors. You can't infer anything about when packets were transmitted from this. Sam
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