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On 3 Sep 2004, Luke wrote:
> Daniel Pittman wrote:
>> On 3 Sep 2004, Jon Bendtsen wrote:
>>> Den 3. sep 2004, kl. 4:49, skrev Paewell@xxxxxxxxxxxxxx:
[...]
>> To the original poster: you email address is non-functional. You will
>> often get better advice if you post from a valid, working email address.
[...]
> Can you please repeat it for the benefit of others on the list? Or just
> forward the original email to me please :)
Since you asked so nicely, yes:
On 3 Sep 2004, Paewell@xxxxxxxxxxxxxx wrote:
> I am testing OpenVPN 2.0b11 between two Win XP, sp1 computers.
> As a test, one of the computers dials in to the Internet.
> It works, but is really, really slow. Eventually, the
> connection will be at least 256K upload in both directions.
> But, until then, I tought I'd take advantage of the slow
> connection to optomize things as much as possible.
>
> Are there any tricks to get a slow connection to go its fastest?
On one hand, use very deep transmit queues and the largest MTU/MRU you
can get on the connection.
This will give you the highest throughput at the expense of the highest
latency.
On the other hand, use very shallow transmit queues and a small MTU/MRU;
512 bytes is pretty common.
This will give you reasonable latency performance without *too* much
impact on bulk data transmission.
On the third hand, disable error correction and compression in the
modem, and use a smaller MTU/MRU.
This will reduce the latency of the modem link which, these days, is
often as high as the entire rest of the packet path.
The cost, of course, is that you are more likely to suffer packet loss,
which the lower MTU/MRU reduces the cost of recovering from.
At the end of the day, though, there really are not *that* many things
which make a big difference to the "performance" of a serial modem for
any value of performance.
Regards,
Daniel
--
I give you bitter pills in sugar coating.
The pills are harmless, the poison is in the sugar.
-- Stanislaw Lec
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