Date: Sun, 30 Oct 2011 23:24:55 +0400 From: Lev Serebryakov <lev@FreeBSD.org> To: Adrian Chadd <adrian@freebsd.org>, freebsd-wireless@freebsd.org Subject: AR9280: very strange upload speed Message-ID: <591784976.20111030232455@serebryakov.spb.ru> In-Reply-To: <723076644.20111030221555@serebryakov.spb.ru> References: <872994138.20111026222719@serebryakov.spb.ru> <CAJ-Vmonbsq35Jc=H_G%2BZKgVH1DvNSPkSKoJMLVG1vx7OcHdNaw@mail.gmail.com> <723076644.20111030221555@serebryakov.spb.ru>
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Hello, Adrian. You wrote 30 =EE=EA=F2=FF=E1=F0=FF 2011 =E3., 22:15:55: > It is AR9280, HostAP, 802.11ng mode, ht/20 channel, 802.11g client > (only one). And speed of upload is very low and unstable. iperf in TCP mode (I could not find proper combination of keys to force iperf to show real UDP speed every N seconds) with large windows, Wireless client in server mode (sends) and wired computer in client mode (receives): http://lev.serebryakov.spb.ru/wifi/ap-ar9280-802.11ng-ht20-11g-client-wirel= ess2wired-tcp-10sec-window.png X is seconds from start of experiment, Y is speed in 10 seconds window (-i 10 key for iperf) in Kbit/s. Speed is oscillate between 400Kbit and 3Mbit... Please note: 3Mbit, not MegaBYTE! If window is 1 second (-i 1) there will be a lot of ZERO samples! Speed in other direction (wireless client and wired server) shows almost stable 10 Mbits/s (not ideal, but much better)... # ifconfig wlan0 wlan0: flags=3D8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 15= 00 ether f4:ec:38:a3:10:6d inet6 fe80::f6ec:38ff:fea3:106d%wlan0 prefixlen 64 scopeid 0xc inet6 2001:470:923f:2::1 prefixlen 64 inet 192.168.135.1 netmask 0xffffff00 broadcast 192.168.135.255 nd6 options=3D21<PERFORMNUD,AUTO_LINKLOCAL> media: IEEE 802.11 Wireless Ethernet autoselect mode 11ng <hostap> status: running ssid home.serebryakov.spb.ru channel 9 (2452 MHz 11g ht/20) bssid f= 4:ec:38:a3:10:6d regdomain ROW country RU indoor ecm authmode WPA2/802.11i privacy MIXED deftxkey 2 AES-CCM 2:128-bit AES-CCM 3:128-bit txpower 30 scanvalid 60 protmode CTS -ampdutx ampdurx ampdulimit 64k ampdudensity 8 shortgi wme burst dtimperiod 1 -dfs # ifconfig wlan0 list sta ADDR AID CHAN RATE RSSI IDLE TXSEQ RXSEQ CAPS FLAG 00:18:de:08:e8:1d 1 9 54M 19.5 0 13624 51824 EPS AQE RSN W= ME --=20 // Black Lion AKA Lev Serebryakov <lev@FreeBSD.org>
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