----- Original Message ----- From: "Michael T. Babcock" <mbabcock@fibrespeed.net> To: <lartc@mailman.ds9a.nl> Sent: Friday, June 07, 2002 4:18 PM Subject: RE: [LARTC] SFQ buckets/extensions > > In a long term always droping from the largest subqueue > > gives you equal subqueues. > > And, of course, one could have it drop them using a RED-like algorithm > to make the sessions stabilize themselves better. If you are dealing with a responsive session (like TCP) that is... > > what they have) is better. May be doing it like the cbq with average > > packet size can gave us better results. > > Calculating average packet size on the fly isn't that hard either. > > > All started with the so called Download Accelerators, > > which do paralel gets and make TCP behave bad. > > In normal case TCP adjusts fast and does not create backlogs. > > But when you have to change it's bandwidth , you have to create > > a backlog to slow it down. It then clears fast. > > I actually usually download pieces of the same file from multiple > mirrors if its truly large and want it fast :-). Ranged downloads make > that quite possible ... The only way to equalize bandwidth "fairly" in > these scenarios still seems to be to implement the hierarchial approach > of hashing against destination IP (the user receiving the packets) and > then having sub-queues to those queues based on ports and to drop > packets (based on RED?) in each of these sub-queues (because they're > closer to the actual TCP sessions involved). > Why not implementing the sfb (stochastic fair Blue)? From the papers I read, the algorithm with the double buffered moving hash extension, seemed like a better alternative for the FRED, Stochastic fair RED and SFQ. > > People wanted options to tune hashsize/limits/depths and > > the most wanted (needed) was the option to select hash type. > > SRC/DST Port hash is in TODO now. > > And I'm glad it exists for testing at least. > -- > Michael T. Babcock > CTO, FibreSpeed Ltd. > > _______________________________________________ > LARTC mailing list / LARTC@mailman.ds9a.nl > http://mailman.ds9a.nl/mailman/listinfo/lartc HOWTO: http://lartc.org/ > > _______________________________________________ LARTC mailing list / LARTC@mailman.ds9a.nl http://mailman.ds9a.nl/mailman/listinfo/lartc HOWTO: http://lartc.org/
