Date: Tue, 29 Jan 2002 08:22:09 -0500 From: talist@vif.com To: stable@freebsd.org Subject: Re: Crashing Freebsd + Dummynet + heavy traffic + workaround Message-ID: <1012310529.3c56a2017d4d4@email.vif.com>
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I noticed that the box can be made much more resilient by boosting the following kernel variable: options HZ=1000 # granularity was 100 After rebuilding the kernel, freebsd did not freeze but I am sure this is only a workaround. Dummynet should not be able to lock-out the machine. > I am using a freebsd box as a gateway in order to throttle down bandwidth for > some particular traffic. > The box freezes under high load and the only way to recover is through a power > cycle. > The crash does not generate any logs, but I have ruled out hardware causes. I > can repeat the lock-out with 2 different hardware and with xl(4) and dc(4) NIC's > > I am suspecting a problem with DUMMYNET's PIPE and QUEUE. > > I have collected all the config information about the machine with a small > script that helps in crashing the box after a few minutes of alternating the > dummynet pipe's size. > http://www.geocities.com/dummynetus/ipfw.txt > > In summary, I have tried the following: > - Boost maxusers to 128 > - Boost NMBCLUSTERS to 10240 > - monitor netstat -m gives normal readings even before freeze > To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message
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