Date: Mon, 17 Oct 2005 15:46:15 +0200 From: Heinrich Rebehn <rebehn@ant.uni-bremen.de> To: Nicolas KOWALSKI <Nicolas.Kowalski@imag.fr> Cc: freebsd-fs@freebsd.org Subject: Re: [UPDATE] Re: FreeBSD NFS server not responding to TCP SYN packets from Linux/SunOS clients Message-ID: <4353AB27.6070409@ant.uni-bremen.de> In-Reply-To: <Pine.LNX.4.64.0510171347100.5718@corbeau.imag.fr> References: <Pine.LNX.4.64.0510141021290.22064@corbeau.imag.fr> <20051014160128.hev160v52ossokg0@wwws.cs.ait.ac.th> <20051014045824.V5343@odysseus.silby.com> <vqou0fkw92s.fsf@obiou.imag.fr> <Pine.LNX.4.64.0510171347100.5718@corbeau.imag.fr>
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Nicolas KOWALSKI wrote: > On Fri, 14 Oct 2005, Nicolas KOWALSKI wrote: > > >>Mike Silbersack <silby@silby.com> writes: > > >>>Actually, there may be a quick fix for this specific machine. If >>>you set net.inet.tcp.keepidle to 1 minute (60*whatever kern.hz is), >>>that'll cause keepalive packets to be sent every minute to an idle >>>connection, rather than every 2 hours. That would kill the stuck >>>connections much quicker. >> >>Unfortunately, this does not work as expected. I just tested with my >>workstation (Linux 2.6), with NFS filesystems mounted with TCP; when >>the station rebooted abruptely, mounting the same NFS filesystems hung >>more than 1 minute (15 minutes just now). During this hang, I saw on >>the server, using netstat, the nfsd process related to my workstation >>in ESTABLISHED state. > > > Thanks to Olivier, his suggestion to restart the nfsd processes after > setting net.inet.tcp.keepidle makes the situation much better ! > > Now, this work as expected ; Linux and SunOS workstations do not hang > more than a few seconds when mounting shares from the FreeBSD server > after an unclean shutdown. I am still waiting for other problems to come > up with this configuration, but after a few hours, it just looks really > good. :-) > > Many thanks to all ! > > Best regards, Great news. I will give that a try. Still, i wonder if it is possible to have the server close the open connections with a small program that one could call before the first mount. Can someone give me a hint? --Heinrich -- Heinrich Rebehn University of Bremen Physics / Electrical and Electronics Engineering - Department of Telecommunications - Phone : +49/421/218-4664 Fax : -3341
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