From owner-freebsd-xen@freebsd.org  Wed Jul 29 13:59:51 2015
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Date: Wed, 29 Jul 2015 14:58:50 +0100
From: Karl Pielorz <kpielorz_lst@tdx.co.uk>
To: Egoitz Aurrekoetxea <egoitz@sarenet.es>
cc: xen@FreeBSD.org
Subject: Re: Poor network performance with Xen + OpenVPN?
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--On 29 July 2015 14:28 +0200 Egoitz Aurrekoetxea <egoitz@sarenet.es> wrote:

> Hi!
>
> Have you disabled tso, lro and friends?.
>

If by that you mean,

  ifconfig xn0 -rxcsum -txcsum -tso4 -lro

Yes - I've tried that on the virtual host running OpenVPN, it didn't seem 
to make any difference :(

I'll hopefully get some more time later to look at it again.

Regards,

-Karl