Re: [ANNOUNCE] TCP Westwood+

[David S. Miller]

On Thu, 15 Jan 2004 13:28:18 +0100
"Angelo Dell'Aera" <buffer@xxxxxxxxxxxx> wrote:

> I just want to announce I released a patch which implements 
> TCP Westwood+ algorithm in Linux kernel 2.4. It's available
> on my homepage (reported below).

Angelo, this work is very interesting, I'm deep in your's and related papers
on this topic right now :-)

It would be very interesting to see how westwood+ compares to F-RTO, in
particular over wireless networks since both purport to improve things over
such technologies.

Since F-RTO is available in both 2.4.x and 2.6.x kernels now, such experiments
should be easy to run.

Also, it would be interesting, once we have a working TCP Vegas implementation
again, to see how combinations of Westwood+/VEGAS and F-RTO/Vegas compared
to flat new-reno.  In particular, since VEGAS attempts to avoid the packet loss
from happening in the first place, and if it does still happen Westwood+/F-RTO will
handle them more gracefully, the overall result should be something approaching
the sum of the parts :-)

Also, it would be very interesting to consider in depth whether the BW estimation
filtering done by Westwood+ to thwart ACK compression could help TCP Vegas's
BW estmiators as well.

Baring some huge problem, I would be happy to put a cleaned up
Westwood+ in the kernel, available always, but disabled by default via
sysctl (as I believe is implemented in your patch) until we have more experimental
results.

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