Lewis Adam-CAL022 wrote:
Hi all, I am evaluating the Westwood protocol in the lab using NISTnet as an emulator. So far I am seeing little to zero improvement of TCP performance using Westwood as opposed to the Vegas implementation in the kernel. I have two NISTnet boxes to simulate packet loss and delay in both the upstream and downstream path. NISTnet is programmed to induce 500ms delay, drop 5% of packets and emulate 1Mbps bandwidth. I'm using iperf and sending 3.2M of data. I am using the 2.6.12 kernel. These results are very disappointing as publications I've seen show much better improvement with a high BDP (I assume bandwidth=1Mbps * delay=500ms qualifies). I am seeing best case 5% improvement over Reno/Vegas.
I am not that familiar with Westwood so I can't tell you what type of improvement you should expect, but the BDP you mention is not that high (1Mb*0.5=500kbit=40Kbyte window). Have you tried larger BDP's with the same result? Best Regards Filipe
Am I using a valid version of Westwood in this kernel? Is there anyway to verify that it is running, aside from cat-ing the /proc files? Anything in /var/log/messages or elsewhere? Or is this really the best one can hope for with Westwood (e.g. 5% improvement)? Tx, Adam - : send the line "unsubscribe linux-net" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
-- Filipe Lameiro Abrantes INESC Porto Campus da FEUP Rua Dr. Roberto Frias, 378 4200-465 Porto Portugal Phone: +351 22 209 4266 E-mail: fla@xxxxxxxxxxxxx - : send the line "unsubscribe linux-net" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
