Date: Sun, 23 May 2010 21:54:36 -0500 From: Brandon Gooch <jamesbrandongooch@gmail.com> To: Kurt Jaeger <pi@opsec.eu> Cc: freebsd-net@freebsd.org, Kip Macy <kip.macy@gmail.com> Subject: Re: kern/146792: [flowtable] flowcleaner 100% cpu's core load Message-ID: <AANLkTikXrtkLUswmjRpmAvWOQqOj-snwp4cYbBUUgR0d@mail.gmail.com> In-Reply-To: <201005232206.o4NM6gor016873@freefall.freebsd.org> References: <201005232206.o4NM6gor016873@freefall.freebsd.org>
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On Sun, May 23, 2010 at 5:06 PM, Kurt Jaeger <pi@opsec.eu> wrote: > The following reply was made to PR kern/146792; it has been noted by GNAT= S. > > From: Kurt Jaeger <pi@opsec.eu> > To: bug-followup@FreeBSD.org, niko@gtelecom.ru > Cc: > Subject: Re: kern/146792: [flowtable] flowcleaner 100% cpu's core load > Date: Sun, 23 May 2010 16:19:25 +0200 > > =A0Hi! > > =A0I observe a similar behaviour on a 8.0-RELEASE-p2 i386 GENERIC > =A0kernel. > > =A0System receives 2 BGP4 fullfeeds (approx. 310K routes each). > > =A0The system is still running, a few processes are unkillable or > =A0die only after a long amount (1-2h) of time. > > =A0Here's the list of unkillable processes: > > =A080871 =A0?? =A0R =A0 =A0 =A00:00.00 /bin/sh /etc/periodic/daily/470.st= atus-named > =A076499 =A0?? =A0Rs =A0 =A0 0:00.01 sshd: [accepted] (sshd) > =A076922 =A0?? =A0Rs =A0 =A0 0:00.01 sshd: [accepted] (sshd) > > =A0flowcleaner looks pretty busy (for an uptime of approx. 40h): > > =A0 =A022 =A0?? =A0RL =A0 1209:50.98 [flowcleaner] > > =A04:17PM =A0up 1 day, 22:22, 2 users, load averages: 7.20, 6.53, 5.81 > > =A0quagga is running on the system, bgpd mgmt cli is no longer reachable: > > =A0# telnet 0 2605 > =A0Trying 0.0.0.0... > =A0Connected to 0. > =A0Escape character is '^]'. > > =A0^] > =A0telnet> close > =A0Connection closed. > =A0# > > =A0What can I do to help to debug this ? > =A0No console access available right now, but can probably made available= . > > =A0This is a production host, but not yet super-critical, so... I know absolutely nothing about quagga, and very, very little about the flowcleaner process (or flowtable, no man page), but I DO KNOW that Kip Macy suggested disabling: options FLOWTABLE from the kernel config of the machine experiencing the issue. This was back in December 2009, so I'm not sure about a resolution to the actual problem (or if it is just inherent in the design of the per-cpu routing cache). Perhaps Kip may have more insight? -Brandon
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