2009/1/22 Glenn Burkhardt <gbburkhardt@xxxxxxxxxxx>: > On Friday 16 January 2009 10:33:13 Bob Copeland wrote: >> On Thu, Jan 15, 2009 at 5:34 PM, Glenn Burkhardt >> >> <gbburkhardt@xxxxxxxxxxx> wrote: >> > ath5k_pci 0000:00:07.0: PCI INT A -> GSI 18 (level, low) -> IRQ 18 >> > ath5k_pci 0000:00:07.0: registered as 'phy0' >> > phy0: Selected rate control algorithm 'pid' >> >> Can you change the rate control algorithm to minstrel and retry? > > I'll have to say that performance is worse with minstrel than pid rate > control. I used Channel 2 on the router, and: > > ath_pci: > DepotRd:/home/gbb-suse/wireless # ping 192.168.2.1 > PING 192.168.2.1 (192.168.2.1) 56(84) bytes of data. > 64 bytes from 192.168.2.1: icmp_seq=1 ttl=64 time=5.82 ms > 64 bytes from 192.168.2.1: icmp_seq=2 ttl=64 time=1.32 ms > 64 bytes from 192.168.2.1: icmp_seq=3 ttl=64 time=0.967 ms > 64 bytes from 192.168.2.1: icmp_seq=4 ttl=64 time=0.954 ms > 64 bytes from 192.168.2.1: icmp_seq=5 ttl=64 time=0.970 ms > 64 bytes from 192.168.2.1: icmp_seq=6 ttl=64 time=1.14 ms > 64 bytes from 192.168.2.1: icmp_seq=7 ttl=64 time=1.32 ms > 64 bytes from 192.168.2.1: icmp_seq=8 ttl=64 time=0.981 ms > 64 bytes from 192.168.2.1: icmp_seq=9 ttl=64 time=0.961 ms > 64 bytes from 192.168.2.1: icmp_seq=10 ttl=64 time=3.88 ms > 64 bytes from 192.168.2.1: icmp_seq=11 ttl=64 time=0.962 ms > 64 bytes from 192.168.2.1: icmp_seq=12 ttl=64 time=0.894 ms > 64 bytes from 192.168.2.1: icmp_seq=13 ttl=64 time=0.991 ms > 64 bytes from 192.168.2.1: icmp_seq=14 ttl=64 time=0.968 ms > 64 bytes from 192.168.2.1: icmp_seq=15 ttl=64 time=0.978 ms > 64 bytes from 192.168.2.1: icmp_seq=16 ttl=64 time=1.10 ms > 64 bytes from 192.168.2.1: icmp_seq=17 ttl=64 time=0.999 ms > 64 bytes from 192.168.2.1: icmp_seq=18 ttl=64 time=0.998 ms > DepotRd:/home/gbb-suse/wireless # iwconfig > lo no wireless extensions. > > eth0 no wireless extensions. > > wifi0 no wireless extensions. > > ath0 IEEE 802.11g ESSID:"Belkin_N_Wireless_A99331" > Mode:Managed Frequency:2.417 GHz Access Point: 00:1C:DF:A9:93:31 > Bit Rate:36 Mb/s Tx-Power:15 dBm Sensitivity=1/1 > Retry:off RTS thr:off Fragment thr:off > Encryption key:FA2D-087E-61EF-D860-2E7D-46C9-AF65-CA4C Security > mode:restricted > Power Management:off > Link Quality=37/70 Signal level=-59 dBm Noise level=-96 dBm > Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0 > Tx excessive retries:0 Invalid misc:0 Missed beacon:0 > > > ath5k with pid: > > DepotRd:/home/gbb-suse/linux-2.6.28.1 # ping 192.168.2.1 > PING 192.168.2.1 (192.168.2.1) 56(84) bytes of data. > 64 bytes from 192.168.2.1: icmp_seq=1 ttl=64 time=1729 ms > 64 bytes from 192.168.2.1: icmp_seq=5 ttl=64 time=2320 ms > 64 bytes from 192.168.2.1: icmp_seq=6 ttl=64 time=2050 ms > 64 bytes from 192.168.2.1: icmp_seq=8 ttl=64 time=1402 ms > 64 bytes from 192.168.2.1: icmp_seq=9 ttl=64 time=1323 ms > 64 bytes from 192.168.2.1: icmp_seq=11 ttl=64 time=1151 ms > 64 bytes from 192.168.2.1: icmp_seq=13 ttl=64 time=608 ms > 64 bytes from 192.168.2.1: icmp_seq=14 ttl=64 time=1134 ms > 64 bytes from 192.168.2.1: icmp_seq=15 ttl=64 time=1100 ms > 64 bytes from 192.168.2.1: icmp_seq=16 ttl=64 time=356 ms > 64 bytes from 192.168.2.1: icmp_seq=17 ttl=64 time=164 ms > 64 bytes from 192.168.2.1: icmp_seq=18 ttl=64 time=423 ms > ping: sendmsg: Network is unreachable > 64 bytes from 192.168.2.1: icmp_seq=20 ttl=64 time=407 ms > ping: sendmsg: Network is unreachable > 64 bytes from 192.168.2.1: icmp_seq=23 ttl=64 time=1086 ms > 64 bytes from 192.168.2.1: icmp_seq=24 ttl=64 time=1442 ms > DepotRd:~ # iwconfig > lo no wireless extensions. > > eth0 no wireless extensions. > > wmaster0 no wireless extensions. > > wlan0 IEEE 802.11bg ESSID:"Belkin_N_Wireless_A99331" > Mode:Managed Frequency:2.417 GHz Access Point: 00:1C:DF:A9:93:31 > Bit Rate=54 Mb/s Tx-Power=27 dBm > Retry min limit:7 RTS thr:off Fragment thr=2352 B > Encryption key:E854-5075-1208-1225-D46B-46E6-CB2C-B627-DA3D-788E- > F50E-7351-DDE0-C111-E9A5-1FB7 [2] Security mode:open > Power Management:off > Link Quality=53/100 Signal level:-69 dBm Noise level=-103 dBm > Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0 > Tx excessive retries:0 Invalid misc:0 Missed beacon:0 > > > > ath5k with minstrel > > dmesg | egrep 'ath|phy' > BIOS-provided physical RAM map: > Setting physnode_map array to node 0 for pfns: > ath5k_pci 0000:00:07.0: PCI INT A -> GSI 18 (level, low) -> IRQ 18 > ath5k_pci 0000:00:07.0: registered as 'phy0' > phy0: Selected rate control algorithm 'minstrel' > ath5k phy0: Atheros AR5213A chip found (MAC: 0x59, PHY: 0x43) > ath5k phy0: RF2112B 2GHz radio found (0x46) > > DepotRd:# ping 192.168.2.1 > PING 192.168.2.1 (192.168.2.1) 56(84) bytes of data. > ping: sendmsg: Network is unreachable > ping: sendmsg: Network is unreachable > ping: sendmsg: Network is unreachable > 64 bytes from 192.168.2.1: icmp_seq=1 ttl=64 time=13159 ms > ping: sendmsg: Network is unreachable > ping: sendmsg: Network is unreachable > ping: sendmsg: Network is unreachable > ping: sendmsg: Network is unreachable > ping: sendmsg: Network is unreachable > 64 bytes from 192.168.2.1: icmp_seq=8 ttl=64 time=40968 ms > 64 bytes from 192.168.2.1: icmp_seq=10 ttl=64 time=42986 ms > ping: sendmsg: Network is unreachable > 64 bytes from 192.168.2.1: icmp_seq=15 ttl=64 time=41983 ms > ping: sendmsg: Network is unreachable > 64 bytes from 192.168.2.1: icmp_seq=16 ttl=64 time=42860 ms > DepotRd:~ # iwconfig > lo no wireless extensions. > > eth0 no wireless extensions. > > wmaster0 no wireless extensions. > > wlan0 IEEE 802.11bg ESSID:"Belkin_N_Wireless_A99331" > Mode:Managed Frequency:2.417 GHz Access Point: 00:1C:DF:A9:93:31 > Bit Rate=54 Mb/s Tx-Power=27 dBm > Retry min limit:7 RTS thr:off Fragment thr=2352 B > Encryption key:1193-9C46-9CB0-B2EE-99CA-EA37-7EB4-1B62-9475-B834- > AE70-AA4F-B4A5-B303-3D51-4244 [2] Security mode:open > Power Management:off > Link Quality=56/100 Signal level:-67 dBm Noise level=-103 dBm > Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0 > Tx excessive retries:0 Invalid misc:0 Missed beacon:0 > > O.K. so both algorithms have overestimated the rate, madwifi with minstrel sets it to 36M and both pid an minstrel on ath5k/mac80211 set it to 54M. This results packet corruption and packet loss. Please try locking the rate to 18M - 36M and check the performance again (also an iperf udp test would be very usefull) to see if this is only a problem with the algorithm or a more generic problem. -- GPG ID: 0xD21DB2DB As you read this post global entropy rises. Have Fun ;-) Nick -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
