Date: Thu, 24 May 2007 21:59:41 +0200 From: Andre Oppermann <andre@freebsd.org> To: Gleb Smirnoff <glebius@FreeBSD.org> Cc: net@FreeBSD.org Subject: Re: TCP problems after 124 days of uptime? Message-ID: <4655EEAD.2060307@freebsd.org> In-Reply-To: <20070524182545.GF89017@FreeBSD.org> References: <20070524182545.GF89017@FreeBSD.org>
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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. -- Andre
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