Date: Thu, 24 May 2007 13:52:33 -0700 From: Luigi Rizzo <rizzo@icir.org> To: Andre Oppermann <andre@freebsd.org> Cc: net@freebsd.org Subject: Re: TCP problems after 124 days of uptime? Message-ID: <20070524135233.D54579@xorpc.icir.org> In-Reply-To: <4655EEAD.2060307@freebsd.org>; from andre@freebsd.org on Thu, May 24, 2007 at 09:59:41PM %2B0200 References: <20070524182545.GF89017@FreeBSD.org> <4655EEAD.2060307@freebsd.org>
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On Thu, May 24, 2007 at 09:59:41PM +0200, Andre Oppermann wrote: > Gleb Smirnoff wrote: > > Yesterday two of our web servers running 6.2-PRERELEASE experienced > > problems with accepting TCP connections. A small percentage of SYN > > packets was ignored. The packets were seen in tcpdump output, but not > > processed by TCP stack. No accept queue overflows occured, according > > to 'netstat -sp tcp'. > > > > Failing to find any clue I have rebooted one of them, and after > > reboot is started to work flawlessly. Reboot also helped the second > > one. Both servers were booted at the same time - 124 days ago. > > > > Any ideas, any similar reports? > > ticks is a 32 bit signed integer and TCP isn't really aware of it > going negative and rolling over. This is something I'm working on > fixing in -current. Haven't analyzed all potential cases there yet. by chance, is your 'hz' set to 200 ? this might explay something, because 2^31/(86400*200) = 124.275 cheers luigi
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