Date: Tue, 6 Jan 2009 08:16:01 +0000 (GMT) From: Robert Watson <rwatson@FreeBSD.org> To: Lin Jui-Nan Eric <ericlin@tamama.org> Cc: freebsd-net@freebsd.org, stable@freebsd.org Subject: Re: TCP packet out-of-order problem Message-ID: <alpine.BSF.2.00.0901060813240.12075@fledge.watson.org> In-Reply-To: <47713ee10901052025y26d342f6me0aea946a49b6f0a@mail.gmail.com> References: <47713ee10812301206j12b35264o715976c154080a1b@mail.gmail.com> <47713ee10901012147k1f25c31bn512dd29b2b294ad5@mail.gmail.com> <47713ee10901012249w65c659bbp3366e4d8ef25c59d@mail.gmail.com> <alpine.BSF.2.00.0901051312370.98366@fledge.watson.org> <47713ee10901052025y26d342f6me0aea946a49b6f0a@mail.gmail.com>
next in thread | previous in thread | raw e-mail | index | archive | help
On Tue, 6 Jan 2009, Lin Jui-Nan Eric wrote: > I thought that the system auto-tune improperly in this case. Hmm. Do you have a custom setting for kern.ipc.nmbclusters in loader.conf or sysctl.conf? What does kern.ipc.nmbclusters configure itself to on your system? Also, could you send me the output of uname -a on the system? Thanks, Robert N M Watson Computer Laboratory University of Cambridge > On Mon, Jan 5, 2009 at 9:13 PM, Robert Watson <rwatson@freebsd.org> wrote: >> On Fri, 2 Jan 2009, Lin Jui-Nan Eric wrote: >> >>> After running "netstat -s -p tcp", we found that lots of packets are >>> discarded due to memory problems. We googled for it, and found that sysctl >>> oid "net.inet.tcp.reass.maxsegments" became 0, therefore packets never >>> reassembled. >>> >>> Then we checked our /boot/loader.conf and /etc/sysctl.conf, and found that >>> setting kern.ipc.nmbclusters="0" makes net.inet.tcp.reass.maxsegments=0. >>> After setting net.inet.tcp.reass.maxsegments="1600" in /boot/loader.conf, >>> the network works perfectly now. >> >> Was it set to 0 through a configuration error, or did the system auto-tune >> improperly? >> >> Robert N M Watson >> Computer Laboratory >> University of Cambridge >> >>> >>> Thank you all for the help! >>> _______________________________________________ >>> freebsd-stable@freebsd.org mailing list >>> http://lists.freebsd.org/mailman/listinfo/freebsd-stable >>> To unsubscribe, send any mail to "freebsd-stable-unsubscribe@freebsd.org" >>> >> >
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?alpine.BSF.2.00.0901060813240.12075>