I have been testing Intrepid for quite some time now. I have recently switched 
to 2.6.27-1-generic to test this particular issue, but the slow network 
performances are still there. However, as mentioned in the upstream bug report, 
using the module option qos_enable=0 solves the problem without seemingly 
affecting network performances in other configurations. Of cours this would 
have to be tested more thoroughly but I think it would be sound to add
options iwlagn qos_enable=0 
to /etc/modprobe.d/options with a comment in this file as a workaround.

Please note that the orignial bug (ping issue) has been closed but that another 
one monitoring the data transfer rate issue
was opened some times ago 
(http://www.intellinuxwireless.org/bugzilla/show_bug.cgi?id=1669)

There hasn't been many activity for this bug report recently however,
besides the last comments on qos_enable=0.

-- 
iwl4965 unusable: packet loss, slow network
https://bugs.launchpad.net/bugs/183796
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