From: Thomas Pedersen <thomas@cozybit.com>
To: ath9k-devel@lists.ath9k.org,
linux-wireless <linux-wireless@vger.kernel.org>
Cc: Bob Copeland <me@bobcopeland.com>
Subject: Re: ath9k_htc and reported mactime
Date: Sat, 20 Oct 2012 19:41:14 -0700 [thread overview]
Message-ID: <20121021024114.GA9558@shredder> (raw)
In-Reply-To: <CAG6hwVP5YkBEN9vZPGGEHbK=9ow2wJJ1x_BvSQbDzUscTiOHTA@mail.gmail.com>
re-sending non-HTML to l-w.
Hi list,
We're seeing some issue with reported mactime by the ath9k_htc (AR9271)
card. Here is a mesh node sampling peer beacons:
[ 327.928774] got beacon from 00:03:7f:10:4e:1a at 80969926, now is: 80940131. offset == 29795
[ 329.716530] got beacon from 64:70:02:0a:4e:a8 at 82824946, now is: 82727604. offset == 97342
[ 329.974276] got beacon from 00:03:7f:10:4d:f7 at 83082820, now is: 82985314. offset == 97506
[ 329.977528] got beacon from 00:03:7f:10:4e:1a at 83084622, now is: 82988562. offset == 96060
[ 331.764782] got beacon from 64:70:02:0a:4e:a8 at 84774638, now is: 84775531. offset == -893
[ 332.022278] got beacon from 00:03:7f:10:4e:1a at 85064980, now is: 85033000. offset == 31980
[ 332.025529] got beacon from 00:03:7f:10:4d:f7 at 85033451, now is: 85036249. offset == -2798
[ 333.814536] got beacon from 64:70:02:0a:4e:a8 at 86824159, now is: 86824975. offset == -816
[ 334.260908] got beacon from 00:03:7f:10:4e:11 at 87270487, now is: 87271277. offset == -790
[ 335.861412] got beacon from 64:70:02:0a:4e:a8 at 89100008, now is: 88871534. offset == 228474
[ 336.119176] got beacon from 00:03:7f:10:4d:f7 at 89128456, now is: 89129238. offset == -782
[ 336.308535] got beacon from 00:03:7f:10:4e:11 at 89317801, now is: 89318590. offset == -789
[ 337.909662] got beacon from 64:70:02:0a:4e:a8 at 90951396, now is: 90919468. offset == 31928
[ 338.168034] got beacon from 00:03:7f:10:4e:1a at 91209720, now is: 91177797. offset == 31923
[ 338.171285] got beacon from 00:03:7f:10:4d:f7 at 91211047, now is: 91181053. offset == 29994
[ 338.356286] got beacon from 00:03:7f:10:4e:11 at 91463481, now is: 91366022. offset == 97459
[ 338.734784] got beacon from f8:d1:11:65:92:e4 at 91743653, now is: 91744461. offset == -808
[ 339.958041] got beacon from 64:70:02:0a:4e:a8 at 92966623, now is: 92967531. offset == -908
[ 340.217914] got beacon from 00:03:7f:10:4d:f7 at 93226490, now is: 93227356. offset == -866
[ 340.408290] got beacon from 00:03:7f:10:4e:11 at 93449578, now is: 93417704. offset == 31874
[ 342.006291] got beacon from 64:70:02:0a:4e:a8 at 95014620, now is: 95015461. offset == -841
[ 342.264413] got beacon from 00:03:7f:10:4e:1a at 95272637, now is: 95273538. offset == -901
[ 342.453286] got beacon from 00:03:7f:10:4e:11 at 95461607, now is: 95462386. offset == -779
[ 342.833168] got beacon from f8:d1:11:65:92:e4 at 95939657, now is: 95842204. offset == 97453
The number after "at" is rx_status->mactime, "now" is drv_get_tsf(), and
offset (ie. stack delay) is mactime - tsf. RX_FLAG_MACTIME_MPDU is on for
all frames, and mesh sync is not adjusting the TSF.
How can we possibly receive frames from the future!?
Thanks in advance,
Thomas
next parent reply other threads:[~2012-10-21 2:41 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CAG6hwVP5YkBEN9vZPGGEHbK=9ow2wJJ1x_BvSQbDzUscTiOHTA@mail.gmail.com>
2012-10-21 2:41 ` Thomas Pedersen [this message]
2012-10-22 14:31 ` [ath9k-devel] ath9k_htc and reported mactime Adrian Chadd
2012-10-24 19:45 ` Thomas Pedersen
2012-10-24 21:22 ` Adrian Chadd
2012-10-24 21:26 ` Adrian Chadd
2012-10-24 22:08 ` Thomas Pedersen
2012-10-24 23:33 ` Adrian Chadd
2012-10-25 1:54 ` Adrian Chadd
2012-10-25 2:13 ` Adrian Chadd
2012-10-25 20:42 ` Adrian Chadd
2012-10-25 22:25 ` Thomas Pedersen
2012-10-25 22:27 ` Adrian Chadd
2012-10-26 0:41 ` Thomas Pedersen
2012-10-26 0:42 ` Adrian Chadd
2012-10-24 22:04 ` Thomas Pedersen
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