Hi, It looks like the NIC is retrying enough that rate control just keeps dropping the rate. Or, the NIC isn't retrying but the rate control is being told lies. :-)
We'll have to look at the driver to see what's going on! Please bug us in #freebsd-wifi in efnet. :) -adrian On 9 October 2017 at 02:29, Rouan Lucas van Ryn <r...@sdf.org> wrote: > I have been experiencing slow network speeds with my FreeBSD (11.0) > system on my wireless LAN. > > My wireless card is a USB ZyDAS card: > zyd0: <ZyDAS USB2.0 WLAN, rev 2.00/48.10, addr 2> on usbus3 > > When I start networking, wireless speeds seem OK (~700KB/s when scp'ing > a file to my laptop on the WLAN), but after around 10 seconds of network > activity drop off to become very slow (~70KB/s). Speeds stay slow until > networking is restarted and then pick up again momentarily. Tests with > iperf yield similar results. > > I have found that the wireless connection is being renegotiated at lower > and lower speeds: > wlan0: [0c:d6:bd:1a:19:24] AMRR: current rate 72, txcnt=11, retrycnt=17 > wlan0: [0c:d6:bd:1a:19:24] AMRR decreasing rate 48 (txcnt=11 retrycnt=17) > wlan0: [0c:d6:bd:1a:19:24] AMRR: current rate 48, txcnt=11, retrycnt=14 > wlan0: [0c:d6:bd:1a:19:24] AMRR decreasing rate 36 (txcnt=11 retrycnt=14) > wlan0: [0c:d6:bd:1a:19:24] AMRR: current rate 36, txcnt=11, retrycnt=13 > wlan0: [0c:d6:bd:1a:19:24] AMRR decreasing rate 24 (txcnt=11 retrycnt=13) > wlan0: [0c:d6:bd:1a:19:24] AMRR: current rate 24, txcnt=11, retrycnt=11 > wlan0: [0c:d6:bd:1a:19:24] AMRR decreasing rate 22 (txcnt=11 retrycnt=11) > wlan0: [0c:d6:bd:1a:19:24] AMRR: current rate 22, txcnt=11, retrycnt=13 > wlan0: [0c:d6:bd:1a:19:24] AMRR decreasing rate 18 (txcnt=11 retrycnt=13) > wlan0: [0c:d6:bd:1a:19:24] AMRR: current rate 18, txcnt=11, retrycnt=11 > wlan0: [0c:d6:bd:1a:19:24] AMRR decreasing rate 12 (txcnt=11 retrycnt=11) > wlan0: [0c:d6:bd:1a:19:24] AMRR: current rate 12, txcnt=11, retrycnt=12 > wlan0: [0c:d6:bd:1a:19:24] AMRR decreasing rate 11 (txcnt=11 retrycnt=12) > wlan0: [0c:d6:bd:1a:19:24] AMRR: current rate 11, txcnt=11, retrycnt=11 > wlan0: [0c:d6:bd:1a:19:24] AMRR decreasing rate 4 (txcnt=11 retrycnt=11) > wlan0: [0c:d6:bd:1a:19:24] AMRR: current rate 4, txcnt=11, retrycnt=11 > wlan0: [0c:d6:bd:1a:19:24] AMRR decreasing rate 2 (txcnt=11 retrycnt=11) > wlan0: [0c:d6:bd:1a:19:24] AMRR: current rate 2, txcnt=11, retrycnt=11 > > The same wireless card works well (no slowdown) when connected to a > different computer (not FreeBSD) in the same room, leading me to suspect > that this isn't a hardware or signal strength issue. > > Netstat shows that packets are being retransmitted: > tcp: > 109179 packets sent > 108551 data packets (110570192 bytes) > 575 data packets (534156 bytes) retransmitted > 6 data packets unnecessarily retransmitted > ... > > Relevant parts of ifconfig: > zyd0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 2290 > ether 00:25:xx:xx:xx:xx > nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL> > media: IEEE 802.11 Wireless Ethernet autoselect mode 11g > status: associated > wlan0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500 > ether 00:25:xx:xx:xx:xx > inet 192.168.1.6 netmask 0xffffff00 broadcast 192.168.1.255 > nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL> > media: IEEE 802.11 Wireless Ethernet DS/1Mbps mode 11g > status: associated > ssid SPARK-XXXX channel 1 (2412 MHz 11g) bssid 0c:d6:bd:1a:19:24 > regdomain APAC country NZ authmode WPA2/802.11i privacy ON > deftxkey UNDEF TKIP 2:128-bit txpower 30 bmiss 7 scanvalid 60 bgscan > bgscanintvl 300 bgscanidle 250 roam:rssi 7 roam:rate 5 protmode CTS > roaming MANUAL > > Note in particular the line: > media: IEEE 802.11 Wireless Ethernet DS/1Mbps mode 11g > > ifconfig wlan0 scan gives me: > SSID/MESH ID BSSID CHAN RATE S:N INT CAPS > SPARK-XXXX 0c:d6:bd:1a:19:24 1 54M -58:-95 100 EP RSN HTCAP WPS WPA > (among other networks) > > -- > Thanks, > Rouan > _______________________________________________ > freebsd-wireless@freebsd.org mailing list > https://lists.freebsd.org/mailman/listinfo/freebsd-wireless > To unsubscribe, send any mail to "freebsd-wireless-unsubscr...@freebsd.org" _______________________________________________ freebsd-wireless@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-wireless To unsubscribe, send any mail to "freebsd-wireless-unsubscr...@freebsd.org"
