[CDBUG-talk] Abysmal wireless network performance.

Chuck Atkins chuck.atkins at kitware.com
Fri Mar 5 04:20:26 EST 2010

I'm seeing some very poor performance when using WiFi and I don't really
know where to start looking.  For example:

A ping to my gateway shows reasonably fast responses when no other network
traffic is happening:

PING ( 56 data bytes
64 bytes from icmp_seq=0 ttl=64 time=6.938 ms
64 bytes from icmp_seq=1 ttl=64 time=8.561 ms
64 bytes from icmp_seq=2 ttl=64 time=9.516 ms
64 bytes from icmp_seq=3 ttl=64 time=5.939 ms

But if I start any other network traffic, say an ftp transfer, then the
response time skyrockets and the transfer rate reflects this:

64 bytes from icmp_seq=63 ttl=64 time=6.849 ms
64 bytes from icmp_seq=64 ttl=64 time=4.978 ms
64 bytes from icmp_seq=65 ttl=64 time=251.623 ms
64 bytes from icmp_seq=68 ttl=64 time=291.099 ms
64 bytes from icmp_seq=69 ttl=64 time=387.732 ms
64 bytes from icmp_seq=70 ttl=64 time=485.485 ms
64 bytes from icmp_seq=71 ttl=64 time=457.686 ms
64 bytes from icmp_seq=72 ttl=64 time=507.699 ms
64 bytes from icmp_seq=73 ttl=64 time=117.663 ms

I'm running 8-STABLE and using the iwn driver with an Intel 4965agn card.
 This problem only happens over wireless and is not an issue when using a
hard wired connection.

Your thoughts?

- Chuck
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