Guys Considering the festive season is upon us, thanks to everyone contributing to the list and helping all the readers with your great input! I don't want to mention names, I'll most certainly leave someone out. With this mail I'd like to test some theory on bandwidth management, with my own successes and failures during the past year. Sharing a link between 200 users This has probably been my worst headache this year, since all the trials go well but the implementation doesn't run as expected. So here goes. We have one connection that is shared by 200 users. Mostly students, so abuse is rampant. Each user should have an upper-limit for speed, but the upper limit times the number of users exceed the link capacity (over subscription). The speed must degrade as more and more users are online, so that in peak times the link must still be usable for each and every user, even if dreadfully slow. Here is the implementation in theory: Total internet capacity: X Total number of users: 200 Minimum transfer rates: Y = X / 200 Maximum transfer rates: Z = 8 * Y Over subscription rate: 1:50 I tried to achieve this, but below are my hiccups -= HTB =- Set the parent class for internet traffic to X, with 200 children. Each child has a rate of Y, their totals equal X. Each child also has a ceil of Z. This means that Z * 200 > X, hence the over subscription. What happens here is that several people download at Z, but their speed does not decrease when more people start accessing the internet. They stay at Z, which is a problem. -= HFSC =- Tried playing around with the curves, but a lack of knowledge and resources has hampered me from figuring out this one. In essence, the same problem occurs, the link isn't shared equally between the active users. -= WRR =- My favourite, but with the most disappointment at the moment... I can see the weights are adjusted, and our trials have shown that the link gets shared equally. However, in implementation it doesn't work that way. The abusers can still go mad, and now at link capacity (X), no longer at Z. This has caused some serious problems for non-abusive users. Can anyone advise me on how to get this done properly, please. Somewhere I must be missing something small, and I don't want to paste millions of lines of scripts in here until I know I've got the theory right. The over subscription is the big problem, pure rate limiting works like a charm in my other experiments. Thanks in advance -- Kenneth Kalmer kenneth.kalmer@xxxxxxxxx Folding@home stats http://fah-web.stanford.edu/cgi-bin/main.py?qtype=userpage&username=kenneth%2Ekalmer _______________________________________________ LARTC mailing list LARTC@xxxxxxxxxxxxxxx http://mailman.ds9a.nl/cgi-bin/mailman/listinfo/lartc
