Re: [lvs-users] LVS-DR and scp

To: Kaizaad Bilimorya <kaizaad@xxxxxxxxxxx>
Subject: Re: [lvs-users] LVS-DR and scp
Cc: lvs-users@xxxxxxxxxxxxxxxxxxxxxx, scooter@xxxxxxxxxxxx
From: Simon Horman <horms@xxxxxxxxxxxx>
Date: Thu, 5 May 2011 21:30:58 +0900
On Wed, May 04, 2011 at 04:38:26PM -0400, Kaizaad Bilimorya wrote:
> re:
> Just thought I would post an update to this since we saw the same symptoms 
> (including the frags from the tcpdump) and our solution might be helpful 
> to others.
> Turning off generic-receive-offload fixed the problem for us.
> # ethtool -k eth1
> ...snip
> generic-receive-offload: on
> # ethtool -K eth1 gro off
> ...snip
> generic-receive-offload: off
> The network card on the director:
> Ethernet controller: Intel Corporation 82576 Gigabit Network Connection (rev 
> 01)
> OS and kernel:
> CentOS release 5.5 (Final)
> Linux 2.6.18-194.32.1.el5 #1 SMP Wed Jan 5 17:52:25 EST 2011 x86_64 x86_64 
> x86_64 GNU/Linux


there is a problem with LVS+GRO, so turning it off is a good idea.
The problem should be resolved in 2.6.39 (which should be released soon),
and LVS+GRO should be able to co-exist.

LVS+LRO is a similar problem which is yet to be resolved.

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