Poor network performance with Xen + OpenVPN?

[seanrees at gmail.com]

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>
wrote:

>
>
> --On 29 July 2015 14:28 +0200 Egoitz Aurrekoetxea <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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