Pete Heist <p...@eventide.io> writes: >> On Apr 16, 2018, at 11:23 PM, Toke Høiland-Jørgensen <t...@toke.dk> wrote: >> >>> I remember that fairness behavior at low RTTs (< 20ms) needed to be >>> either improved or documented, and don’t see anything about that in >>> the man page in the tc-adv repo thus far. Summarizing the host >>> isolation results at >>> http://www.drhleny.cz/bufferbloat/cake/round2/#hostiso_cake_{rtt}_{qos-id} >>> <http://www.drhleny.cz/bufferbloat/cake/round2/#hostiso_cake_%7Brtt%7D_%7Bqos-id%7D>: >>> >>> RTT: fairness (1.0 == perfect fairness) >>> --- >>> 100us: 2.22 >>> 1ms: 1.7 >>> 2ms: 1.6 >>> 3ms: 1.42 >>> 5ms: 1.31 >>> 8ms: 1.16 >>> 10ms: 1.12 >>> 20ms: 1.02 >>> 40ms: 1.017 >> >> Erm, what's the metric and which data source are you looking at here? > > > Subject changed... > > The clients were as follows: > Client 0- 1 stream up > Client 1- 12 streams up > Client 2- 1 stream down > Client 3- 12 streams down > > It looks like what I used before was Client 3’s “TCP Download Sum avg” > divided by Client 2’s “TCP Download avg” from the srchost/dsthost tests. The > data’s in a table here (see column “Client 3 Mean / Client 2 Mean”): > > https://docs.google.com/spreadsheets/d/1e06ZfHSSmecJx9sPU2s2g2GYCS18cMIhBN8PXf1jwaM/edit?usp=sharing > > <https://docs.google.com/spreadsheets/d/1e06ZfHSSmecJx9sPU2s2g2GYCS18cMIhBN8PXf1jwaM/edit?usp=sharing> > > I was calculating by hand before, so the numbers are slightly different, but > that’s the idea. > > Now, these tests were done at 500Mbit between two cabled APU2s, so we > could just be running out of CPU on this hardware at lower RTTs. There > are CPU stats included, and a “Flent Data Files” section. Is it > possible to tell from this if CPU is the problem? The highest median > client load I see looks to be 0.77 for the 40ms tests, for example, > with a mean of 0.63.
Well, the CPU usage meter is just summing that first line of /proc/stat; so yeah, individual CPUs can definitely be 100% loaded. And the fact that the test only achieves a total of ~200 Mbps rather than the 500 would indicate that this is the case... -Toke _______________________________________________ Cake mailing list Cake@lists.bufferbloat.net https://lists.bufferbloat.net/listinfo/cake