Date: Thu, 24 May 2007 14:30:47 -0700 From: Julian Elischer <julian@elischer.org> To: Andre Oppermann <andre@freebsd.org> Cc: Gleb Smirnoff <glebius@FreeBSD.org>, net@FreeBSD.org Subject: Re: TCP problems after 124 days of uptime? Message-ID: <46560407.9080404@elischer.org> In-Reply-To: <4655EEAD.2060307@freebsd.org> References: <20070524182545.GF89017@FreeBSD.org> <4655EEAD.2060307@freebsd.org>
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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. > 124 days is 32 bits at 400Hz or 30 bits at 100Hz what is the granularity of the TCP timer?
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