Date: Tue, 2 Aug 2011 13:56:48 +0100 From: "Steven Hartland" <killing@multiplay.co.uk> To: "Steven Hartland" <killing@multiplay.co.uk>, "Andre Oppermann" <andre@freebsd.org> Cc: freebsd-net@freebsd.org, lstewart@freebsd.org Subject: Re: tcp failing to recover from a packet loss under 8.2-RELEASE? Message-ID: <C60FFD9AD3EE40698B52F4C014808A3A@multiplay.co.uk> References: <E18D678F05BB4F3B93ADEB304CCA8504@multiplay.co.uk><1F95A4C2D54E4F369830143CBDB5FF86@multiplay.co.uk><4E37C0F2.4080004@freebsd.org><2B063B6D95AA4C27B004C50D96393F91@multiplay.co.uk><C706DEE346684B8DB06CFC090F556E72@multiplay.co.uk> <BF7A6AD38BBC4BBFA85609E9560F52BC@multiplay.co.uk>
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----- Original Message ----- From: "Steven Hartland" > I look forward to hearing peoples thoughts on what the actual fix > should be: increased default nmbclusters, decreased nmbclusters => > maxsegments divisor, or something else? Another useful piece of information is that even though maxsegments is set as a read only tuneable, it can be changed on the fly by changing kern.ipc.nmbclusters, which seems a bit strange tbh, so possibly an oversight there somewhere. Example:- sysctl net.inet.tcp.reass.maxsegments=16464 sysctl: oid 'net.inet.tcp.reass.maxsegments' is a read only tunable sysctl: Tunable values are set in /boot/loader.conf sysctl net.inet.tcp.reass.maxsegments net.inet.tcp.reass.maxsegments: 1680 sysctl kern.ipc.nmbclusters=262144 kern.ipc.nmbclusters: 25600 -> 262144 sysctl net.inet.tcp.reass.maxsegments net.inet.tcp.reass.maxsegments: 16464 Regards Steve ================================================ This e.mail is private and confidential between Multiplay (UK) Ltd. and the person or entity to whom it is addressed. In the event of misdirection, the recipient is prohibited from using, copying, printing or otherwise disseminating it or any information contained in it. In the event of misdirection, illegible or incomplete transmission please telephone +44 845 868 1337 or return the E.mail to postmaster@multiplay.co.uk.
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