Poor network performance with Xen + OpenVPN?

[Egoitz Aurrekoetxea]

Could you paste your onpenvpn’s server and client config files?. Which OS the client runs?

Have you tested this openvpn connectivity without any network devices between them?. With for example an ip in the 
loopback interface of the openvpn server?

Best regards,



Egoitz Aurrekoetxea
Departamento de sistemas
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egoitz at sarenet.es <mailto:egoitz at sarenet.es>
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> El 30/7/2015, a las 11:41, seanrees at gmail.com escribió:
> 
> I have the same issue. I managed to track it down to a difference between somewhere between Xen 3.4 and 4.4 (my provider uses both).
> 
> 3.4 works fine (I can sustain a few mbps through OpenVPN). 4.4 I get ~0.05mbps max. I wasn't able to track it down.
> 
> Both with the virtual drivers (if_xn) with all combinations of tso, lro, rxcsum and txcsum on/off tested.
> 
> Sean
> 
> On Wed, Jul 29, 2015 at 2:58 PM, Karl Pielorz <kpielorz_lst at tdx.co.uk <mailto:kpielorz_lst at tdx.co.uk>> wrote:
> 
> 
> --On 29 July 2015 14:28 +0200 Egoitz Aurrekoetxea <egoitz at sarenet.es <mailto:egoitz at 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
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