Date: Fri, 06 Jun 2008 16:01:53 -0400 From: Geoffrey Mainland <mainland@eecs.harvard.edu> To: freebsd-net@freebsd.org Subject: Major Atheros issues with Ubiquiti SR9/XR9 Message-ID: <484997B1.5020708@eecs.harvard.edu>
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Hi, I'm running 7-CURRENT on several ALIX 3c2 boards with SR9 radios and having major performance problems: throughput on TCP streams generated by iperf often falls to zero, and, depending on the HAL I use, I see ping latencies during one of these iperf transfers of up to more than a *minute*. I've tried both the 0.9.30.13 HAL and the new 0.10.5.6 HAL. I see this bad behavior with both, but the new HAL seems even worse. I've documented my configuration and the test results at http://www.eecs.harvard.edu/~mainland/freebsd/sr9/. This includes the kernel configuration, dmesg output, pciconf output, rc.conf, athstats output, appropriate sysctl values, iperf/ping output generated by my driver script and some plots showing the problem. We are trying to deploy a bunch of these nodes outdoors, using the 900MHz radios as a backhaul, so the drop-outs I see with SR9s are a major problem for us. I've also run the same tests on Soekris nodes, used different SR9s, and also tried the new XR9s on the same ALIX boards---all with similar results. We also have a bunch of Wistrom CM9s which seem to work just fine. Any idea what could be going on? Thanks! Geoff
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