Date: Fri, 12 Sep 2014 10:57:01 -0700 From: Nathan Whitehorn <nwhitehorn@freebsd.org> To: Adrian Chadd <adrian@freebsd.org> Cc: "freebsd-wireless@freebsd.org" <freebsd-wireless@freebsd.org> Subject: Re: Issues with urtwn Message-ID: <541333ED.8020005@freebsd.org> In-Reply-To: <CAJ-VmongioOZQS561Qq5S1T0UVnBifxrQf8P0rr8jEWzk=dumQ@mail.gmail.com> References: <540C751F.6050202@freebsd.org> <CAJ-VmokyPcS077wHiP4Mdetms=meqk47v29fKA1edidhorVQpg@mail.gmail.com> <540C92D6.4030106@freebsd.org> <CAJ-VmomMwJOSz7hyAfeEgPE=qBfYm7fTOo5km8JJk4g62JxTkg@mail.gmail.com> <540CC53A.90600@freebsd.org> <CAJ-Vmokt_kgxW3aPEDcNwg_ZVrCotqF_tOP1YjZCtO=nCZ8z5Q@mail.gmail.com> <540E2A2D.4090301@freebsd.org> <CAJ-VmongioOZQS561Qq5S1T0UVnBifxrQf8P0rr8jEWzk=dumQ@mail.gmail.com>
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This is what the debug output looks like when things go wrong: wlan0: [54:78:1a:a0:91:22] sta power save mode on wlan0: wlan0: [54:78:1a:a0:91:22] save frame with age 41, 1 now queued [54:78:1a:a0:91:22] sta power save mode off wlan0: [54:78:1a:a0:91:22] flush ps queue, 1 packets queued wlan0: [54:78:1a:a0:91:22] sta power save mode on wlan0: [54:78:1a:a0:91:22] save frame with age 41, 1 now queued wlan0: [54:78:1a:a0:91:22] save frame with age 0, 2 now queued wlan0: [54:78:1a:a0:91:22] save frame with age 0, 3 now queued wlan0: [54:78:1a:a0:91:22] save frame with age 0, 4 now queued wlan0: ieee80211_sta_tim_notify: TIM=1 wlan0: ieee80211_sta_tim_notify: TIM=1 wlan0: ieee80211_sta_tim_notify: TIM=1 wlan0: ieee80211_sta_tim_notify: TIM=1 wlan0: ieee80211_sta_tim_notify: TIM=1 wlan0: [54:78:1a:a0:91:22] save frame with age 0, 5 now queued wlan0: [54:78:1a:a0:91:22] save frame with age 0, 6 now queued Let me know if I can test anything else. -Nathan On 09/08/14 15:17, Adrian Chadd wrote: > Please compile your kernel with IEEE80211_DEBUG, then enable debugging > - wlandebug +state +power > > You can disable powersave with 'ifconfig wlan0 -powersave', but it > shouldn't be enabled by default. > > > > -a > > > On 8 September 2014 15:14, Nathan Whitehorn <nwhitehorn@freebsd.org> wrote: >> So it's definitely to do with powersave. Here's a bunch of iterations of >> ifconfig list sta on my laptop: >> ADDR AID CHAN RATE RSSI IDLE TXSEQ RXSEQ CAPS FLAG >> 54:78:1a:a0:91:22 149 1 54M 37.0 0 4385 37104 EPS A HTCAP >> RSN WME >> ADDR AID CHAN RATE RSSI IDLE TXSEQ RXSEQ CAPS FLAG >> 54:78:1a:a0:91:22 149 1 54M 37.5 0 4412 39360 EPS A HTCAP >> RSN WME >> ADDR AID CHAN RATE RSSI IDLE TXSEQ RXSEQ CAPS FLAG >> 54:78:1a:a0:91:22 149 1 54M 37.5 0 4417 39360 EPS AP HTCAP >> RSN WME >> ADDR AID CHAN RATE RSSI IDLE TXSEQ RXSEQ CAPS FLAG >> 54:78:1a:a0:91:22 149 1 54M 37.5 0 4417 39360 EPS AP HTCAP >> RSN WME >> ADDR AID CHAN RATE RSSI IDLE TXSEQ RXSEQ CAPS FLAG >> 54:78:1a:a0:91:22 149 1 54M 37.5 0 4417 39360 EPS AP HTCAP >> RSN WME >> >> You can see the connection die on the third line, when the txseq and rxseq >> counters stop incrementing and 'P' gets added to the FLAG field. Does this >> mean the AP has turned on powersave on its end? >> -Nathan >> >> >> On 09/07/14 14:07, Adrian Chadd wrote: >>> Hi, >>> >>> The way it's supposed to work in the legacy 802.11 powersave world is >>> that you send a/any data frame with the powermgt bit in the 802.11 >>> header set to 0 and the AP goes "oh they're awake!" and sends you your >>> buffered frames. >>> >>> By default powersave isn't enabled, so we should never be _telling_ >>> the AP that we're going to sleep and the stack always sends data >>> frames with pwrmgt=0. >>> >>> You can ensure it's disabled by ifconfig wlan0 -powersave >>> >>> The code in -HEAD that manages that is in ieee80211_power.c. I added >>> an explicit powersave support mode for NICs that need it done for them >>> - and the only one it's enabled for right now is ath(4). >>> >>> The only reason net80211 sends pwrmgt changes outside of having >>> net80211 power save enabled is the background scan code. >>> >>> I'd compile in IEEE80211_DEBUG in your kernel, then I'd use wlandebug >>> +scan to see if somehow there's some scanning going on; and wlandebug >>> +power to see if any power save transitions occur. >>> >>> Are you absolutely sure it's a receive side buffering problem, rather >>> than a send side problem? >>> >>> It's also possible that the NIC stops receiving and the AP treats that >>> as "oh ok, they've gone to sleep for a while." ath(4) now does this in >>> hostap mode. >>> >>> >>> -a >>>
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