Patch to add burst to dummynet ?

[Luigi Rizzo]

On Tue, Feb 21, 2006 at 06:12:01AM -0800, Donald Baud wrote:
> Looking back in the mailing archives http://docs.freebsd.org/cgi/getmsg.cgi?fetch=62536+0+archive/2003/freebsd-ipfw/20030907.freebsd-ipfw , I found a message saying that it would be trivial to add burst support in dummynet.
> In that message, it says to change in ip_dummynet.c :
> 
> -       if (len_scaled > q->numbytes )
> +       if (len_scaled > q->numbytes + q->burst_size)
> 
> I did that, even tried len_scaled = 0
> But I don't see any difference after recompiling, kldunload/kldload dummynet.
> 
> I still get the same throughput with wget --progress=dot some_file

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