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Re: [lvs-users] Slow LVS NAT with Debian Squeeze 6.0.3 kernel >2.6.32-38

To: "lvs-users@xxxxxxxxxxxxxxxxxxxxxx" <lvs-users@xxxxxxxxxxxxxxxxxxxxxx>
Subject: Re: [lvs-users] Slow LVS NAT with Debian Squeeze 6.0.3 kernel >2.6.32-38
From: Benjamin Von Mossner <benjamin.von.mossner@xxxxxxxxxxx>
Date: Thu, 5 Apr 2012 04:27:17 -0400
Hi,

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 
Debian squeeze.

So disabling it via ethtool solved the problem.
[snip]
# ethtool -K eth0 gro off
# ethtool -k eth0 | fgrep 'generic-receive-offload'
generic-receive-offload: off
[snap]

Hope this helps.

Benjamin von Mossner


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