Patch to add burst to dummynet ?

[Luigi Rizzo]

On Tue, Feb 21, 2006 at 06:57:10AM -0800, Donald Baud wrote:
> 
> 
> --- Luigi Rizzo <rizzo at icir.org> wrote:
...
> > of course you get the same throughput!
> > the burst is just a constant in the time it takes to
> > transfer data,
> > and it is independent of the data size. irrespective
> > of the file
> > size you'll just finish (burst_size/bandwidth)
> > seconds earlier.
> > 
> > cheers
> > luigi
> 
> I ran two tests with the following ipfw rules:
> ipfw pipe 10 config bw 10kbit/s
> ipfw add 5 pipe 10 ip from 10.0.0.1 to me

and so ? as i said, the throughtput is the same, you
just see things happening a little bit (very little, usually) earlier,
and your experiment has no notion of time, and
furthermore there are so many factors influencing
the throughput and the numbers printed by wget
that it's hard to tell how can you see the difference.

assuming, of course, that the patch i suggested works, which i
think but cannot guarantee.

cheers
luigi

> == with: if (len_scaled > q->numbytes) ==
> wget --progress=dot some_file
>     0K .......... ..........  0%    1.13 KB/s
>    50K .......... ..........  1%    1.14 KB/s
>   100K .......... ..........  2%    1.14 KB/s
>   150K .......... ..........  3%    1.14 KB/s
> 
> == with: if (len_scaled > q->numbytes + 100000 )
> wget --progress=dot some_file
>     0K .......... ..........  0%    1.13 KB/s
>    50K .......... ..........  1%    1.14 KB/s
>   100K .......... ..........  2%    1.14 KB/s
>   150K .......... ..........  3%    1.14 KB/s
> 
> 
> 
> 
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