Thx for the numbers! Could you do a TCP_RR while under load from UDP_STREAM?
On Mon, May 21, 2012 at 1:31 AM, Tobias Diedrich <ranma+open...@tdiedrich.de> wrote: > Tobias Diedrich wrote: >> Dave Taht wrote: >> > In looking over the enormous stack of boards and drivers that openwrt >> > supports, I see that many of the ethernet drivers don't yet support >> > Linux 3.3's "Byte Queue Limits", which are discussed here: >> > >> > http://lwn.net/Articles/454390/ >> > >> > It would be good if more did. They improve network performance in the >> > general case enormously, particularly when a link is not connected at >> > it's peak wire speed. >> > >> > *Adding* support for BQL to an ethernet driver is trivial, here's an >> > example of how. >> >> I tried adding BQL to the ramips ethernet driver, however I found >> some interesting behaviour while doing >> "root@OpenWrt:~# netperf -l 120 -t UDP_STREAM -H myserver" >> >> It looks like the briding code still needs to implement this as well? >> >> netperf UDP_STREAM: >> iface limit_min inflight tx mbps remote mbps ping ms >> eth0 0 ~15000 95.71 95.71 ~10ms >> eth0 1000000 ~300000 177.98 23.28(*) ~30ms >> br0 0 ~15000 154.88 33.94(*) ~120ms >> br0 1000000 ~300000 170.92 25.57(*) ~30ms >> >> (*) bwm-ng on the server showed ~100mbps incoming... > [...] >> Haven't tried codel yet... > > Turns out, it works nicely with codel, even with the bridge: > > netperf: netperf -l 120 -t UDP_STREAM -H myserver > fq_codel: tc qdisc add dev eth0 handle 1: root fq_codel target 5ms > > iface eth0 qdisc bql inflight tx mbps sys time ping ms > eth0 pfifo_fast no n/a 182.98(*) 96.43s ~30ms > eth0 fq_codel no n/a 177.98(*) 96.09s ~30ms > eth0 pfifo_fast yes ~15000 95.71 42.73s ~10ms > eth0 fq_codel yes ~15000 95.19 51.52s ~4ms > br0 pfifo_fast yes ~15000 155.19(*) 94.24s ~120ms > br0 fq_codel yes ~15000 90.92 65.52s ~4ms > > (*) 100mbit link after the switch, ifconfig eth0 shows no drops, > so I'm assuming they are getting dropped by the switch. > > -- > Tobias PGP: http://8ef7ddba.uguu.de -- Dave Täht SKYPE: davetaht US Tel: 1-239-829-5608 http://www.bufferbloat.net _______________________________________________ openwrt-devel mailing list openwrt-devel@lists.openwrt.org https://lists.openwrt.org/mailman/listinfo/openwrt-devel
