Pete Heist <p...@eventide.io> writes: >> On Apr 18, 2018, at 7:43 AM, Pete Heist <p...@eventide.io> wrote: >> >> I also think I saw this happen at lower bandwidths as well, when the CPU >> wasn’t loaded. What I’ll do is re-test on the current version I have at, >> say, 50Mbit (or to where load drops substantially), then update to the head >> and test again, and let you know... >> >>> On Apr 17, 2018, at 3:52 PM, Jonathan Morton <chromati...@gmail.com> wrote: >>> >>>> On 16 Apr, 2018, at 11:55 pm, Pete Heist <p...@eventide.io> wrote: >>>> >>>> I remember that fairness behavior at low RTTs (< 20ms) needed to be either >>>> improved or documented >>> >>> The reason for the behaviour, IIRC, was that throughput dropped below 100% >>> when the latency target was reduced too much. Since then there has been a >>> small change which might improve it a little, so a retest would be >>> reasonable. > > At 50mbit I don’t see nearly as much fairness degradation at low RTTs, > although there’s some. Even at 100us, “fairness” is around 1.1 (1.0 being > perfectly fair) instead of the 2.x I saw at 500mbit. I do not see much of a > difference between the latest code (16d7fed, 2018-04-17) and the previous > code I tested (7061401, 2017-12-01), if that info is of use. > > RTT: tcp_1up upload Mbps / tcp_12up upload Mbps > > 7061401 (2017-12-01): > > 100us: 23.80 / 25.85 > 1ms: 23.89 / 29.46 > 10ms: 23.93 / 24.66 > 40ms: 23.96 / 24.10 > 100ms: 23.97 / 24.12 > > 16d7fed (2018-04-17): > > 100us: 23.97 / 26.49 > 1ms: 23.89 / 26.27 > 10ms: 23.98 / 26.37 > 40ms: 23.94 / 24.08 > 100ms: 23.97 / 24.12 > > I can post reports / flent files on request. > > So it appears this is CPU related, and not worth exploring further(?) > and not worth documenting(?) other than that once things have > stabilized, documenting how Cake degrades under various extreme > conditions would be informative.
Awesome, thanks for re-testing! :) -Toke _______________________________________________ Cake mailing list Cake@lists.bufferbloat.net https://lists.bufferbloat.net/listinfo/cake