On Thu, May 10, 2012 at 9:13 AM, John Crispin <j...@phrozen.org> wrote: > On 10/05/12 17:57, 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. >> >> http://huchra.bufferbloat.net/~cero1/openwrt-bql-patches/0103-BQL-support-added-to-ag71xx-driver.patch >> >> * testing BQL* is also trivial - but will require the device to do. >> I've been beat up by memory barrier issues and stuff like that, so it >> pays to do the patch and then run serious tests through it, rather >> than try it blind. > > Hi, > > do you run specific tests or just hammer the unit ?
Hammering via any means is good - netperf, iperf, apache benchmarks, etc. We have been using (and improving) netperf to exercise things like classification and alternate tcp algorithms. You can get that from netperf.org's svn, or There is a version of that already packaged up in the openwrt compatible ceropackages repository here: https://github.com/dtaht/ceropackages-3.3 the new (to be 2.6) version of netperf is not backward compatible with version 2.5, so all sides of the connection need to be running it. useful tests are TCP_STREAM, TCP_MAERTS, and TCP_RR, run multiple times simultaneously, for long periods. (memory barriers are hard to hit). Codel shows up well in a simultaneous TCP_STREAM and TCP_RR test vs pfifo_fast, too. Iperf is a simpler substitute. > > john > > > _______________________________________________ > openwrt-devel mailing list > openwrt-devel@lists.openwrt.org > https://lists.openwrt.org/mailman/listinfo/openwrt-devel -- 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
