-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On Fri, 16 Jan 2004 09:30:40 +0200 Pasi Sarolahti <pasi.sarolahti@iki.fi> wrote: >On Fri, 2004-01-16 at 00:59, David S. Miller wrote: >> 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. >I guess the two algorithms try to tackle a bit different case: Westwood >modifies the congestion control with the intention is to improve >congestion control behaviour after corruption-related packet losses >(right?). F-RTO is meant for detecting spurious RTOs (e.g. for delay >spikes due to error recovery at the lower protocol layers) and avoid >unnecessary retransmissions (and excessive congestion control) after >that. I think Westwood and F-RTO should be usable together, although I >haven't yet checked the patch for any interactions there may be. You're right Pasi. Westwood modifies the congestion control algorithm when loss situations are detected, improving the performances by not blind-setting cwnd and ssthresh but by properly estimating which value is correct to set on the basis of the evaluation done in the connection lifetime. In fact, if you take a look at the patch for kernel 2.4.24, you could easily see that F-RTO and Westwood "work together". :-) >> 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. >This would be great. I think the same :-) Regards. - -- Angelo Dell'Aera 'buffer' Antifork Research, Inc. http://buffer.antifork.org PGP information in e-mail header -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.4 (GNU/Linux) iD8DBQFAB9J5pONIzxnBXKIRAmcwAJ4mE1AKTJXx4dHVmyLHyHQKHT8P5gCfbN1W cPVg63PiC+b2KHkoAN+kgGg= =6cO8 -----END PGP SIGNATURE----- - : send the line "unsubscribe linux-net" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
