Pete Heist <[email protected]> writes: >> On Nov 18, 2017, at 8:02 PM, Dave Taht <[email protected]> wrote: >> >> On Sat, Nov 18, 2017 at 5:18 AM, Pete Heist <[email protected]> wrote: >>> >>> On Nov 17, 2017, at 11:55 PM,[email protected] wrote: >>> >>> Slotting is a crude approximation of the behaviors of shared media such >>> as cable, wifi, and LTE, which gather up a bunch of packets within a >>> varying delay window and deliver them, relative to that, nearly all at >>> once. >>> >>> Nice… >> >> Meh. It really is "crude", and I keeping kicking about ways to somehow >> emulate half (or less) duplex, variable rates around a mean, mcast, >> etc. >> >> it IS very nice to have a rate limiter that actually behaves a bit >> more like wifi, and I hope to also add the new ack fitering stuff to >> it. > > I guess there may never be a way to make this perfect, only to try to > reproduce > the behavior that matters enough to make it usable for testing. > >>> One of the things I also notice in my LAN tests is latencies for different >>> flows staying at more or less fixed (and different) positions relative to >>> the mean in flent results. Those positions, and the mean, can change with >>> each test run. Do you think this could result from the hashing to different >>> hardware queues (four in my case) changing between test runs? >> >> yes if you are using bql probably. Is it sch_mq on top?
Only if you want unlimited mode, and birthday problems, and don't have cpu to burn. > > Yep with bql. I hadn’t thought about mq before. What my qos setup scripts are > doing though is replacing the root qdisc (which now I see defaults to mq) > with a > single cake instance. With bql, should rather be leaving mq and putting four > cake instances underneath it? > >>> And is it >>> worth trying to simulate this effect, or not really? >> >> Dunno. There are a couple ways to turn it off. > > Fair enough... > _______________________________________________ > Cake mailing list > [email protected] > https://lists.bufferbloat.net/listinfo/cake _______________________________________________ Cake mailing list [email protected] https://lists.bufferbloat.net/listinfo/cake
