On 01/11/15 09:47, Sebastian Moeller wrote: > Hi there, > > On Oct 31, 2015, at 21:29 , Dave Taht wrote: > >> The second one is from the interval >> 4, which equates to 6.2ms. I >> note I picked that because some early data (2012) we had showed that >> target slightly greater than cable media acquision (6ms) time was a >> slight win, and it did not hurt to use a number more evenly divisible >> in binary than the arbitrary 5%. > Well, but should it not be 6.2ms even if no rtt is explicitly requested? Currently cake has a lot of corner-cases that are not too well documented either. Sebastian as ever picks up on the exact source of my confusion/point. If 'target=interval/16' is the new mantra then the defaults built in to cake qdisc should be changed, otherwise we have the current situation which is: Default Interval=100ms, target=5ms. If I specify rtt 100ms via the joys of tc, then I have: Interval=100ms, target=6.2ms. If I specify a target keyword such as 'internet' which also has an interval= 100ms, then target become 5ms again. Somewhat inconsistent.