Date: Fri, 25 Nov 2011 18:17:31 +0100 From: =?ISO-8859-1?Q?Gustau_P=E9rez?= <gperez@entel.upc.edu> To: Adrian Chadd <adrian.chadd@gmail.com> Cc: freebsd-wireless@freebsd.org Subject: Re: Big delays between an AR5416 AP and its clients Message-ID: <4ECFCDAB.1080407@entel.upc.edu> In-Reply-To: <CAJ-Vmo=1k=oKP-vDUH=BLdyeVzGnQvNmJ6TwGcdQjwpgJWt52w@mail.gmail.com> References: <3d4d2d249836fafc6acd885693c02198@webmail.entel.upc.edu> <CAJ-Vmo=1k=oKP-vDUH=BLdyeVzGnQvNmJ6TwGcdQjwpgJWt52w@mail.gmail.com>
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On 11/25/11 10:53, Adrian Chadd wrote:
> Hi,
>
> As I've said privately:
>
> * compile w/ ATH_DEBUG, ATH_DIAGAPI, AH_DEBUG
> * and compile src/tools/tools/ath/athstats/
>
> I also suggest:
>
> * compile w/ IEEE80211_DEBUG
> * and compile src/tools/tools/wlan/wlanstats/
>
> (why those aren't built as part of the base is beyond me, but I digress..)
>
> Let's see if we can find some correlations between counters
> incrementing and upset traffic w/ your iphone.
>
All that follows was done with all the debug kernel knobs there.
I did two tests collecting info with athstats.
The first was with no clients associated with the box and then
letting the iphone associate. The athstats dump is at:
http://pastebin.com/EVgFJC7s
The second one was 1 client associated with the box. This client was
sending icmp messages at the default rate of 1 icmp/s:
http://pastebin.com/C5kjuEpg
Neither wlanstats nor dmesg shows additional information. The
kernel only complains about this (I paste it only because it is quite
short):
ar5416PerCalibrationN: NF calibration didn't finish;
delaying CCA
Timeout while waiting for nf to load:
AR_PHY_AGC_CONTROL=0x41d1a
The last message appears from time to time (currently I have it
three times) but it shows up without any correlation with the
association process of the iphone so I would say it has nothing to do
with our problem. It appears to be related with calibration in N mode.
However I'm posting just in case.
Any additional test, let me know.
Gus
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