On Tue, Jun 23, 2015 at 5:55 AM, Mikael Abrahamsson <[email protected]> wrote: > On Tue, 23 Jun 2015, Sebastian Moeller wrote: > >> Most likely not. Check http://wiki.openwrt.org/doc/howto/sqm . >> Rich published a great set of instructions for setting up sqm-scripts under >> openwrt proper. > > > I tried it on Linksys WRT1200AC with OpenWrt CC RC2. I configured sqm to > have 800 megabit/s each direction, and ran iperf3 over IPv4 with NAT44 from > Linux box behind WRT1200AC to an OSX macbook connected on a switch on the > same L2 subnet as the WAN port. > > Linux <->WRT1200AC<->switch<->OSX > > I get 765 megabit/s of throughput using single session, at sirq load of > around 25%. If I lower the mss to 300 (to generate higher pps) I get around > 560 megabit/s of throughput at 50% sirq. With 10 parallel TCP sessions, I > get about the same. At MSS of 200 bytes, I get 400 megabit/s at 70% sirq. > > If I turn off SQM completely, I get 600 megabit/s at 200 byte MSS single > session at 80% sirq and 930 megabit/s at 26% sirq with default MSS.
Yer missing the more important figure. What is the induced latency in all these cases? With the system being software limited, I would imagine that other oddities arise. Running out of cpu, additional oddities. When going at hardware line rate, is fq_codel enabled? Does it ever engage? (My limited testing showed that lacking BQL, delay accrued big time in the drivers themselves on this platform) Good idea on using a reduced MSS size! I would really like to get to the point where cake ran on this platform, but thus far we have not managed to get a working build, nor push cake into mainline openwrt.... my observation is that a lot of the overhead of sqm comes from tc filters, iptables rules and NAT. > So if you want high performing device that is OpenWRT compatible and still > does forwarding using CPU so you can test queuing algorithms, the WRT1200AC > and WRT1900ACv2 is the best I have been able to find currently (unless you > go for x86 platform). yes, x86 is fastest. I have not tried the reduced mss idea on my rangeley box, I will check that out! > -- > Mikael Abrahamsson email: [email protected] > _______________________________________________ > Cerowrt-devel mailing list > [email protected] > https://lists.bufferbloat.net/listinfo/cerowrt-devel -- 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 _______________________________________________ Cerowrt-devel mailing list [email protected] https://lists.bufferbloat.net/listinfo/cerowrt-devel
