Re: [LARTC] HTB MPU

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

Ed Wildgoose wrote:
> 
>>
>> Reading your other post I see your small traffic is ~100b - this would 
>> use three cells, so as a temporary kludge you could set your mpu to 
>> 159 and see how it goes.
>>
>> AFAIK the author of the HTB patch is looking into modifying it to do 
>> the sums properly for DSL. There isn't one answer though - Eds' 
>> formula is fine doing the cells bit, but before this you need to add a 
>> ppp overhead to the IP packet length and this varies with pppoa+vc 
>> mux/pppoe/bridged pppoe and probably other varieties of dsl 
>> implementations.
> 
> 
> 
> I think he said that he is on BT atm based adsl?  Can we perhaps tweak 
> that formula (which is already hardwired) and try to get him something 
> useful.  It sounds like it would be a good vindication for the technique 
> and if it works then we can retro fit it to some modular params which 
> work for more people.  Can't be any worse than the current patch which 
> already doesn't help most adsl users completely...
> In other words, how would I calc the overhead for BT's ppp system?  
> Happy to help write the patch if you can supply the info

See my post to Jason - I think it should be doable, I was just waiting 
to see if it got put into the patch - as the author knows the code and 
has done most of the work already.

Andy.



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