#2290: Performance problem (latency + bandwidth) with madwifi-hal-0.10.5.6-r4016
------------------------------------+---------------------------------------
Reporter: [email protected] | Type: defect
Status: new | Priority: critical
Component: madwifi: other | Version: trunk
Keywords: | Patch_attached: 0
Pending: 0 |
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I have some latency+bandwidth problem with madwifi using this snapshot:
madwifi-hal-0.10.5.6-r4016-20090429
I've compiled and installed it (I'm on Ubuntu Jaunty, and I have used
jockey to activate it).
{{{
Linux ozzu 2.6.28-11-generic #42-Ubuntu SMP Fri Apr 17 01:58:03 UTC 2009
x86_64 GNU/Linux
}}}
This is my lsmod:
{{{
ath_rate_sample 21888 1
ath_pci 224832 0
wlan 259232 5
wlan_tkip,wlan_scan_sta,ath_rate_sample,ath_pci
ath_hal 339088 3 ath_rate_sample,ath_pci
multipath 16512 0
}}}
When the computer boots, everything seems to work correctly. I get perfect
latency (ping times to my AP < 1ms) and perfect bandwidth (an internal
speed-test of my ISP shows 6Mbit down and 1Mbit up, which is my nominal
bandwidth).
But after a few minutes the situation slows degrades. After 5-10 minutes,
ping to the gateway is like this:
{{{
PING 192.168.1.1 (192.168.1.1) 56(84) bytes of data.
64 bytes from 192.168.1.1: icmp_seq=1 ttl=64 time=3.60 ms
64 bytes from 192.168.1.1: icmp_seq=2 ttl=64 time=8.07 ms
64 bytes from 192.168.1.1: icmp_seq=3 ttl=64 time=2.59 ms
64 bytes from 192.168.1.1: icmp_seq=4 ttl=64 time=6.51 ms
64 bytes from 192.168.1.1: icmp_seq=5 ttl=64 time=1.95 ms
64 bytes from 192.168.1.1: icmp_seq=6 ttl=64 time=6.35 ms
64 bytes from 192.168.1.1: icmp_seq=7 ttl=64 time=6.83 ms
64 bytes from 192.168.1.1: icmp_seq=8 ttl=64 time=6.54 ms
64 bytes from 192.168.1.1: icmp_seq=9 ttl=64 time=3.41 ms
64 bytes from 192.168.1.1: icmp_seq=10 ttl=64 time=1.94 ms
64 bytes from 192.168.1.1: icmp_seq=11 ttl=64 time=9.07 ms
64 bytes from 192.168.1.1: icmp_seq=12 ttl=64 time=5.57 ms
64 bytes from 192.168.1.1: icmp_seq=13 ttl=64 time=2.31 ms
^C
--- 192.168.1.1 ping statistics ---
13 packets transmitted, 13 received, 0% packet loss, time 12016ms
rtt min/avg/max/mdev = 1.948/4.984/9.076/2.360 ms
}}}
which is very high compared to the initial < 1ms. Bandwidth tests also
show a very noticable degrade: downstream speed goes to maximum 1Mbit
(instead of 6Mbit) and upstream bandwidth doesn't go over 128Kbit (instead
of 1Mbit).
'''NOTE:''' A bit of bkg history in case it helps. Ubuntu Jaunty ships
with ath5k. This is where my problems started: I experimented random
freezes. Googling around, I saw people that were turning back to madwifi.
I tried, and this is the problem I now see. Notice that this wifi card had
been working correctly in the past 2 years with whatever kernel+madwifi
drivers Ubuntu shipped in the past versions. All the problems arose after
the Jaunty upgrade.
--
Ticket URL: <http://madwifi-project.org/ticket/2290>
madwifi-project.org <http://madwifi-project.org/>
Multiband Atheros Driver for Wireless Fidelity
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