On Sat, 2 Jun 2012, Andy Furniss wrote:
Julien Vehent wrote:
On 2012-06-01 12:42, Niccolò Belli wrote:
> http://lartc.org is alive and kicking and there is no need for
> another
> wiki anymore. I'd like to thank both Bert and Carl-Daniel.
>
> Niccolò
>
Very cool !
I'll try to find some time and move over some of the content I have
here:
http://wiki.linuxwall.info/doku.php/en:ressources:dossiers:networking:traffic_control
A couple of things that stand out after skimming through.
DSL - Jeesper's overhead as noted in the comments is not 5 and anyway I think
his good work has now been superseded by stab as it allows for negative
overheads, which his did not.
Thanks for the credits :-)
Its been a while since I looked at that code. I think, the 5 bytes might
ref to the ATM header 5 + 48 = 53 bytes the ATM cell size. But 5 is not
used as overhead.
The linklayer ATM hack is to adjust the rtable array, that the kernel uses
for lookups. The problem is that the rtable array only have an 8 bytes
"resolution" (well depend on cell_log), thus to get this aligned, I use
the ATM payload size of 48, when populating the rtable array. Then
when storing the "data" I the rtable array I use *53 byte ATM cell size.
man tc-stab has clear and good explanations and examples.
Good to see some documentation on stab, I always found it difficult to
use.
Cheers,
Jesper Brouer
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MSc. Master of Computer Science
Dept. of Computer Science, University of Copenhagen
Author of http://www.adsl-optimizer.dk
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