Date: Sat, 23 Jun 2012 00:41:16 GMT From: Adrian Chadd <adrian@FreeBSD.org> To: freebsd-gnats-submit@FreeBSD.org Subject: misc/169336: [ath] ANI isn't triggering in a busy/noisy environment Message-ID: <201206230041.q5N0fGlU011542@red.freebsd.org> Resent-Message-ID: <201206230050.q5N0o7ZY008746@freefall.freebsd.org>
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>Number: 169336 >Category: misc >Synopsis: [ath] ANI isn't triggering in a busy/noisy environment >Confidential: no >Severity: non-critical >Priority: low >Responsible: freebsd-bugs >State: open >Quarter: >Keywords: >Date-Required: >Class: sw-bug >Submitter-Id: current-users >Arrival-Date: Sat Jun 23 00:50:07 UTC 2012 >Closed-Date: >Last-Modified: >Originator: Adrian Chadd >Release: 9.0-STABLE i386, with -HEAD net80211/ath >Organization: >Environment: >Description: I've noticed that ANI isn't triggering when in a noisy environment. * The ANI poll is called every 1/10th of a second, which updates listenTime; * However, since we're still doing things via the MIB interrupt (grr), it's triggering frequently upon a hardware counter (in this case, CCK) * .. so I see upwards of 1600 CCK errors a second; * .. but ar5416ProcessMibIntr() calculates cckPhyErrCount based on how many just overflowed, so it's seeing the 200 CCK errors that just occured, and that's not greater than cckTrigHigh; * .. so it's never calling ar5416AniCckTrigger(). * Then, ar5416AniRestart() is called, which sets ofdm/cck error count and listentime to 0. Now, because of all of this, the ANI code never seems to trigger on _enough_ of any kind of CCK errors. It's also unclear how the math in ar5416AniPoll() should work. From what I can gather, listenTime is likely supposed to be a value out of 1000. listenTime just never gets that high at the moment, as it keeps being cleared by ar5416AniRestart() whenever the MIB event fires. >How-To-Repeat: >Fix: Not sure. >Release-Note: >Audit-Trail: >Unformatted:
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