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, statistics collected from
the ath driver, 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?
How-To-Repeat: I see this pattern of behavior with both XR9s and SR9s. It also happens on Soekris 4826 motherboards.
Over to maintainer(s).
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For bugs that match the following
- Status Is In progress
- Untouched since 2018-01-01.
- Affects Base System OR Documentation
Reset to open status.
I did a quick pass but if you are getting this email it might be worthwhile to double check to see if this bug ought to be closed.