I have the same alternating latency problem on my Thinkpad T60. It uses the e1000 driver as well. When I ping the Thinkpad from another host on my local network, the ping-times alternate between one second and a few milliseconds, almost always in the sequence long, short, long, short etc. I have tested this with both 6.06.1 and Edgy Eft Knot 3 with the same result.
The long latency makes remote X and ssh very painful to use, since the network seems to freeze one second at a time. This problem has been reported in the Kernel bugzilla: http://bugme.osdl.org/show_bug.cgi?id=6929 ** Bug watch added: Linux Kernel Bug Tracker #6929 http://bugzilla.kernel.org/show_bug.cgi?id=6929 ** Also affects: linux (upstream) via http://bugzilla.kernel.org/show_bug.cgi?id=6929 Importance: Unknown Status: Unknown -- e1000 driver on thinkpad X60/T60 produces latency https://launchpad.net/bugs/42572 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
