Re: [LARTC] HTB MPU

[Andy Furniss <andy.furniss@dsl.pipex.com>]

Jason Boxman wrote:
> On Thursday 13 May 2004 13:28, Andreas Klauer wrote:
> 
>>Am Thursday 13 May 2004 16:38 schrieb Andreas Klauer:
>>
>>>Am Thursday 13 May 2004 15:54 schrieb Andy Furniss:
>>>
>>>>I've just noticed that there is a patch on devik's site which does mpu
>>>>and overhead.
>>>
>>>I'll give it a try. Thanks for the hint.
>>
>>Well, patching was a little difficult... it didn't like the debian patch
>>and I didn't succeed in joining the two patches together because of the
>>weird inject stuff. But anyway.  It seems to work, and it looks useful, so
>>I added it to the "Hacks" section of my Fair NAT script together with a
>>patched binary.
> 
> 
> Nifty.
> 
> But how do you determine what your minimum packet unit (MPU) is?  How about 
> overhead for a PPPoE connection?

If you can get a cell count from your modem you can work it out with 
ping. I don't know what your pppoe is.

> 
> With shaping I can max my upstream and still maintain ~ 120ms ping times, but 
> I'd like to get it down to around ~ 70ms.
> 
Your upstream worst case depends on your bitrate and your MTU. If it's 
128k you add about 90ms, 256k 45ms for 1500b packets. What's yours?

Andy.


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