From mboxrd@z Thu Jan  1 00:00:00 1970
From: Andy Furniss <adf.lists@gmail.com>
Date: Sat, 11 May 2013 11:41:04 +0000
Subject: Re: Poor performance of ingress filter for separate VMs
Message-Id: <518E2E50.2030905@gmail.com>
List-Id: <lartc.vger.kernel.org>
References: <000f01ce4c17$76dfa490$649eedb0$@JAMMConsulting.com>
In-Reply-To: <000f01ce4c17$76dfa490$649eedb0$@JAMMConsulting.com>
MIME-Version: 1.0
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: 7bit
To: lartc@vger.kernel.org

Neil Aggarwal wrote:
> Andy:
>
>> Ahh, tso will also need to be turned off if you want to see normal/real
>> sized packets.
>
> I tried this:
> ethtool -K v1262 tso off
>
> I get back this reponse:
> Cannot set device tcp segmentation offload settings: Operation not supported
>
> I guess I can't change the settings for a virtual device.

Strange, maybe a KVM/whatever virtual driver  issue - I guess there are 
places you can ask.

FWIW I just noticed lo has tso enabled and it turns off OK, so it 
doesn't have to be a real nic.