Hi Dave, hi list,
On Jun 29, 2015, at 01:42 , Dave Taht <[email protected]> wrote: > This is a set of two hop (client-server through switch) results, with > sch_fq on the nuc client, and cake on the rangeley (ranger) server. > > Since we seem to be aiming for sane results from the mvneta, at speeds > at 500mbit... > > http://snapon.lab.bufferbloat.net/~d/k500/ > > Do note that this is a live system with other traffic so it is noisy data. > > Of note, in looking at this dataset in comparison to mikaels, is that > he only got 360mbit bidirectional on rrul_be - where I get full > throughput. admittedly he seemed to be running using htb as the rate > limiter. Being off by *20%* from the set setting (after subtracting > acks) of 500 mbit however, seems to be an issue. So ignoring the ACKs we can expect a TCP/IPv4 payload rate up to 480 Mbps. TCP/IPv4 Payload at 500Mbps shaping: 1500 - 20 - 20 = 1460 Byte payload to OTWS ratio 1460/1518 = 0.961791831357 Payload Bandwidth 500*1460/1518 = 480.90 Mbps Packet rate: 500*1000^2 / (1518 * 8) = 41K In other words a loss of roughly 4 percent for the required protocol headers. For the ACK traffic an rough estimate would be: one ACK for every other packet (allowing delayed ACKs), increasing the packet rates to roughly 60K per direction and eating: (20000 * 64 * 8) / 1000^2 = 10.24 Mbps So a rrul test should give us something close to 470Mbps (ignoring the UDP and ICMP flows and) or roughly 100-100*470/500 = 6% loss not 20%. On the positive side I seem to remember we were looking for a rower that can handle 300Mbps bi-directionally and it seems the 1200ac cmes floes or even exceeds this threshold ;) Best Regards Sebastian > > I will setup another box to do client - router -server this week. > > -- > Dave Täht > worldwide bufferbloat report: > http://www.dslreports.com/speedtest/results/bufferbloat > And: > What will it take to vastly improve wifi for everyone? > https://plus.google.com/u/0/explore/makewififast > _______________________________________________ > Cake mailing list > [email protected] > https://lists.bufferbloat.net/listinfo/cake _______________________________________________ Cerowrt-devel mailing list [email protected] https://lists.bufferbloat.net/listinfo/cerowrt-devel
