Might be a bit late, but should be noted.
We had the same issue on our Testsystem, after upgrading to Debian squeeze.
A posting on http://blog.gmane.org/gmane.comp.linux.lvs.user/month=20111101
from Michael Schwartzkopff gave the right hint and led to the solution.
Looks like starting some when after kernel 2.6.26, generic-segmentation-offload
was introduced and activated by default - at least our NIC - driver: tg3 on
So disabling it via ethtool solved the problem.
# ethtool -K eth0 gro off
# ethtool -k eth0 | fgrep 'generic-receive-offload'
Hope this helps.
Benjamin von Mossner
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