Experiencing very slow browsing at times (atheros wireless)

[Sepherosa Ziehau]

On 5/22/07, Petr Janda <elekktretterr at exemail.com.au> wrote:
I recently purchased a new atheros based WIFI card.

I am using no encryption at the moment. I can ping all websites and the
ping times are fine.
64 bytes from 192.168.1.1: icmp_seq=0 ttl=128 time=0.731 ms
64 bytes from 192.168.1.1: icmp_seq=1 ttl=128 time=0.735 ms
64 bytes from 192.168.1.1: icmp_seq=2 ttl=128 time=0.737 ms
64 bytes from 192.168.1.1: icmp_seq=3 ttl=128 time=1.620 ms
64 bytes from 192.168.1.1: icmp_seq=4 ttl=128 time=0.738 ms
64 bytes from 192.168.1.1: icmp_seq=5 ttl=128 time=0.732 ms
64 bytes from 192.168.1.1: icmp_seq=6 ttl=128 time=0.736 ms
64 bytes from 192.168.1.1: icmp_seq=7 ttl=128 time=0.736 ms
64 bytes from 192.168.1.1: icmp_seq=8 ttl=128 time=0.731 ms
64 bytes from 192.168.1.1: icmp_seq=9 ttl=128 time=0.728 ms
64 bytes from 192.168.1.1: icmp_seq=10 ttl=128 time=0.818 ms
64 bytes from 192.168.1.1: icmp_seq=11 ttl=128 time=0.729 ms
64 bytes from 192.168.1.1: icmp_seq=12 ttl=128 time=0.729 ms
64 bytes from 192.168.1.1: icmp_seq=13 ttl=128 time=0.733 ms
64 bytes from 192.168.1.1: icmp_seq=14 ttl=128 time=0.730 ms
64 bytes from 192.168.1.1: icmp_seq=15 ttl=128 time=0.733 ms
64 bytes from 192.168.1.1: icmp_seq=16 ttl=128 time=0.734 ms
[elevator] ~% ping www.google.com.au
PING www.l.google.com (72.14.253.99): 56 data bytes
64 bytes from 72.14.253.99: icmp_seq=0 ttl=236 time=369.645 ms
64 bytes from 72.14.253.99: icmp_seq=1 ttl=236 time=356.193 ms
64 bytes from 72.14.253.99: icmp_seq=2 ttl=236 time=361.215 ms
64 bytes from 72.14.253.99: icmp_seq=3 ttl=236 time=362.085 ms
64 bytes from 72.14.253.99: icmp_seq=4 ttl=236 time=362.198 ms
64 bytes from 72.14.253.99: icmp_seq=5 ttl=236 time=361.109 ms
64 bytes from 72.14.253.99: icmp_seq=6 ttl=236 time=361.947 ms
They are my normal ping.

However, browsing web pages often slows down to  0kb/s (i can still ping
though).
Please gether some tcpdump information, when this happens:
tcpdump -s 0 -ni ath0 -w dump
802.11 and radio tap tcpdump information will be helpfull too:
tcpdump -s 0 -ni ath0 -y ieee802_11 -w dump80211
tcpdump -s 0 -ni ath0 -y ieee802_11_radio -w dumpradio
ath0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
        inet 192.168.1.50 netmask 0xffffff00 broadcast 192.168.1.255
        inet6 fe80::20f:b5ff:fefa:9196%ath0 prefixlen 64 scopeid 0x1
        ether 00:0f:b5:fa:91:96
        media: IEEE 802.11 Wireless Ethernet autoselect (OFDM/54Mbps)
        status: associated
        ssid homenetwork channel 11 bssid 00:19:db:0a:39:e6
        authmode OPEN privacy OFF txpowmax 37 bmiss 7 protmode CTS burst
        bintval 100
Speed is almost always 54 or 48Mbps.
That's the TX rate.

What's the output of 'ifconfig ath0 up scan'?

Best Regards,
sephe
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