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Message-Id: <200807171631.m6HGVJ3W071966@www.freebsd.org>
Date: Thu, 17 Jul 2008 16:31:19 GMT
From: Geoffrey Mainland <mainland@eecs.harvard.edu>
To: freebsd-gnats-submit@FreeBSD.org
Subject: [ath] Terrible throughput/high ping latency with Ubiquiti SR9/XR9
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>Number:         125721
>Category:       kern
>Synopsis:       [ath] Terrible throughput/high ping latency with Ubiquiti SR9/XR9
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    freebsd-wireless
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:  
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Thu Jul 17 16:40:01 UTC 2008
>Closed-Date:    
>Last-Modified:  Mon Apr 11 23:26:03 UTC 2011
>Originator:     Geoffrey Mainland
>Release:        7.0-STABLE
>Organization:
Harvard University
>Environment:
FreeBSD citysense006 7.0-STABLE FreeBSD 7.0-STABLE #32: Fri Jul 11 19:21:09 UTC 2008     root@citybsd7.citysense.net:/usr/obj/usr/src/sys/CITYBSD  i386
>Description:
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. 
>Fix:


>Release-Note:
>Audit-Trail:
Responsible-Changed-From-To: freebsd-bugs->freebsd-net 
Responsible-Changed-By: arundel 
Responsible-Changed-When: Mon Sep 6 23:05:10 UTC 2010 
Responsible-Changed-Why:  
Over to maintainer(s). 

http://www.freebsd.org/cgi/query-pr.cgi?pr=125721 
Responsible-Changed-From-To: freebsd-net->freebsd-wireless 
Responsible-Changed-By: eadler 
Responsible-Changed-When: Mon Apr 11 23:26:02 UTC 2011 
Responsible-Changed-Why:  
change resp. to new mailing list 

http://www.freebsd.org/cgi/query-pr.cgi?pr=125721 
>Unformatted:
