Date: Tue, 9 Aug 2011 01:03:42 +0400 From: Lev Serebryakov <lev@serebryakov.spb.ru> To: Adrian Chadd <adrian@freebsd.org> Cc: freebsd-wireless@freebsd.org Subject: Re: Bad host-vased AP performace -- and qouple of questions about FreeBSD WiFi stack tuning Message-ID: <693584315.20110809010342@serebryakov.spb.ru> In-Reply-To: <CAJ-VmonrRTRrvR9PWexxVzRzEGS9AW8%2BtZLZqUN1aZT9Uvoqqg@mail.gmail.com> References: <1151152206.20110808220720@serebryakov.spb.ru> <CAJ-VmomMh4uvyJGHHkGsi5_C4p3ZJjRwadmstRVe4BjY76QzoA@mail.gmail.com> <1832976164.20110808222108@serebryakov.spb.ru> <CAJ-VmonrRTRrvR9PWexxVzRzEGS9AW8%2BtZLZqUN1aZT9Uvoqqg@mail.gmail.com>
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Hello, Adrian. You wrote 8 =C1=D7=C7=D5=D3=D4=C1 2011 =C7., 22:26:54: > That's definitely required knowledge. 8.0-RELEASE is a good starting poin= t. > I'm afraid it's going to be difficult for me to narrow down what's > changed without you doing a bit of legwork to find which kernel > version(s) introduced the performance regression. > Once we narrow that down, I'll fix it. :) > Please keep everything else the same though, including the laptop. :) It seems, that 8.0-RELEASE behaves slightly different from very fresh 8-STABLE, but I can not say that it is much better. It is output from `list sta' when notebook (client) is placed exactly the same point as previous experiment: 00:18:de:08:e8:1d 1 9 36M 17.5 0 54585 41344 EPS AQE RSN W= ME 00:18:de:08:e8:1d 1 9 36M 16.0 0 55126 46112 EPS AQE RSN W= ME 00:18:de:08:e8:1d 1 9 36M 17.5 0 55648 50832 EPS AQE RSN W= ME 00:18:de:08:e8:1d 1 9 36M 16.0 0 56169 55632 EPS AQE RSN W= ME 00:18:de:08:e8:1d 1 9 36M 16.0 0 56615 59664 EPS AQE RSN W= ME 00:18:de:08:e8:1d 1 9 24M 16.0 0 57195 65072 EPS AQE RSN W= ME 00:18:de:08:e8:1d 1 9 24M 17.5 0 57936 41344 EPS AQE RSN W= ME 00:18:de:08:e8:1d 1 9 24M 17.0 0 58178 41344 EPS AQE RSN W= ME 00:18:de:08:e8:1d 1 9 24M 16.0 0 58903 41344 EPS AQE RSN W= ME 00:18:de:08:e8:1d 1 9 24M 16.5 0 59465 41344 EPS AQE RSN W= ME 00:18:de:08:e8:1d 1 9 54M 17.5 0 59954 41344 EPS AQE RSN W= ME 00:18:de:08:e8:1d 1 9 54M 17.5 0 60591 41344 EPS AQE RSN W= ME 00:18:de:08:e8:1d 1 9 36M 16.0 0 61343 41344 EPS AQE RSN W= ME It looks like it doesn't drop under 24M now. BUT! When I move notebook into direction of AP (into other room, which is near AP) I've got: 00:18:de:08:e8:1d 1 9 12M 29.0 0 21255 41344 EPS AQE RSN W= ME 00:18:de:08:e8:1d 1 9 12M 28.0 0 22031 46560 EPS AQEP RSN W= ME 00:18:de:08:e8:1d 1 9 12M 30.5 0 22291 46576 EPS AQEP RSN W= ME 00:18:de:08:e8:1d 1 9 12M 30.5 0 22291 46576 EPS AQEP RSN W= ME 00:18:de:08:e8:1d 1 9 12M 30.5 0 22291 46576 EPS AQEP RSN W= ME 00:18:de:08:e8:1d 1 9 12M 30.5 0 22291 46576 EPS AQEP RSN W= ME And after door is closed: 00:18:de:08:e8:1d 1 9 12M 23.0 0 27276 41344 EPS AQE RSN W= ME 00:18:de:08:e8:1d 1 9 12M 22.0 0 27789 41344 EPS AQE RSN W= ME 00:18:de:08:e8:1d 1 9 11M 22.5 0 28134 41344 EPS AQE RSN W= ME 00:18:de:08:e8:1d 1 9 11M 22.5 0 28730 41344 EPS AQE RSN W= ME 00:18:de:08:e8:1d 1 9 11M 21.5 0 29040 41344 EPS AQE RSN W= ME 00:18:de:08:e8:1d 1 9 11M 21.5 0 29369 41344 EPS AQE RSN W= ME 00:18:de:08:e8:1d 1 9 12M 22.5 0 29822 41344 EPS AQE RSN W= ME 00:18:de:08:e8:1d 1 9 11M 21.0 0 30232 41344 EPS AQE RSN W= ME Better RSSI but much worse speed?! I don't have second notebook on hands now to monitor does speed hops up and down, but ``ifconfig wlan0 list sta'' every second gives all this output. It looks like it never works at full and stable 54M now, even if notevook= in direct sight to AP within ~1 meter: 00:18:de:08:e8:1d 1 9 36M 37.5 0 44443 53936 EPS AQEP RSN W= ME 00:18:de:08:e8:1d 1 9 36M 37.5 0 44443 53936 EPS AQEP RSN W= ME 00:18:de:08:e8:1d 1 9 36M 37.5 0 44443 53936 EPS AQEP RSN W= ME 00:18:de:08:e8:1d 1 9 36M 37.5 0 44443 53936 EPS AQEP RSN W= ME 00:18:de:08:e8:1d 1 9 36M 37.5 0 44443 53952 EPS AQEP RSN W= ME 00:18:de:08:e8:1d 1 9 36M 37.5 0 44443 53984 EPS AQEP RSN W= ME And it seems, that in any other situation it works worse, that it theoretically can. Unfortunately, mini-PCI WiFi cards is not easy to get (and almost impossible to borrow for free, even for short time) here, and I can not replace this card in AP and try with another one :( I'll try to build 7-STABLE system, but it will take more time, as I need to adapt configs for it. --=20 // Black Lion AKA Lev Serebryakov <lev@serebryakov.spb.ru>
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