I am also having this problem with jaunty. The network seems to freeze
every 66 seconds for about 27 seconds (i timed it a few times with a
stop watch). I was also looking at syslog, kern.log, messages in
/var/log but no error messages appeared. I was having this problem both
with NetworkManger (in KDE) and when setting up wireless in
/etc/network/interfaces (the old way of doing it). After installing
linux-backports-modules-jaunty this problem seems to have gone away. I
am now using NetworkManager to connect o my wireless N network.

The network speed is bad though. In intrepid I got wierless G speed when
connected to wireless N. About 20 Mbit/s data throughput in both
directions. Now I get 16,4 Mbit/s down and 1,7 Mbit/s up. Even though my
router claims I am connected with wireless N at a "linkspeed" of 162
Mbits.

In Vista (same computer) I get around 60 Mbit/s download rate when using 
wireless N.
I have a Dlink DWA-556 wireless pci card, lspci say:
Network controller: Atheros Communications Inc. AR5008 Wireless Network Adapter 
(rev 01)

-- 
MacBook Pro 3.1 Very Weak Wireless Performance Using Jaunty (Intrepid Works 
Fine)
https://bugs.launchpad.net/bugs/362985
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