[CDBUG-talk] Abysmal wireless network performance.

Kevin McAleavey kevinmca1 at verizon.net
Fri Mar 5 20:30:15 EST 2010

 A thought ... I've seen some genuine squirrelies myself ... when I setup wifi on our machines, I make it a point (Verizoff is our DSL here, and they're AWFUL) to add mtu 1468 in my ifconfig settings. I forget what the default for wifi is, something on the order of 2290 or some such, and it's not a valid MTU at all. Give that a shot, that's what it sounds like to me. Wired ETH does the proper 1500, but the wifi default in BSD 8 is just not right ...

At 04:20 AM 3/5/2010, Chuck Atkins wrote:
>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
>CDBUG-talk mailing list
>CDBUG-talk at lists.nycbug.org

Kevin McAleavey
KNOS Project
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