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Date:      Thu, 30 Jul 2015 10:41:21 +0100
From:      "seanrees@gmail.com" <seanrees@gmail.com>
To:        Karl Pielorz <kpielorz_lst@tdx.co.uk>
Cc:        Egoitz Aurrekoetxea <egoitz@sarenet.es>, "freebsd-xen@freebsd.org" <xen@freebsd.org>
Subject:   Re: Poor network performance with Xen + OpenVPN?
Message-ID:  <CAJGy1F0GVZDuidpJ2CnL_uo_yjhNZJswUkafvbAg6E1wzFYeCA@mail.gmail.com>
In-Reply-To: <5A7F36D35FF28CD4B9D2DE92@10.12.30.106>
References:  <B314E8002A8A1A7A537DB661@Karls-Mac-mini.local> <40E060AB-F0B9-48F3-9309-947CAB5C1939@sarenet.es> <5A7F36D35FF28CD4B9D2DE92@10.12.30.106>

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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@tdx.co.uk>
wrote:

>
>
> --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
> _______________________________________________
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