Date: Wed, 22 Nov 2006 16:29:47 +0100 (CET) From: "S.C.Sprong" <scsprong@gmail.com> To: freebsd-stable@FreeBSD.ORG Subject: Re: Trouble: NFS via TCP Message-ID: <20061122162646.F1354@volte.student.utwente.nl>
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From: "S.C.Sprong" <scsprong@gmail.com> To: freebsd-stable@FreeBSD.ORG Subject: Re: Trouble: NFS via TCP In-Reply-To: <200611091717.kA9HH631005085@lurza.secnetix.de> X-Newsgroups: mpc.lists.freebsd.stable,muc.lists.freebsd.stable In article <200611091717.kA9HH631005085@lurza.secnetix.de> you wrote: >Symptom: As soon as I use the -T option (TCP) with the mount command, >it simply hangs forever. If I use the intr/soft flags, I can Ctrl-C >it after a while, and the mount indeed appears in the output from >"mount", but any command that tries to access it (e.g. ls(1)) also >hangs. Even umount(8) hangs. I've had the same problems and made similar observations. A few more: - Running 'tcpdump tcp port 2048' on the NFS server _after_ the client is stuck in this state causes a spontaneous reboot of the server. - Running 'netstat -a' shows that the client is stuck in an endless connect-disconnect loop and chews through port numbers. - It happens with fxp, rl, and sis cards. - TCP initial window size advertisement doesn't seem to matter. - While using UDP I may have encountered a similar bus as described in NetBSD bugs bin/20663: deadlock in cron(8) Many reboots later, I solved my problem by disabling the following tweaks I had in /etc/sysctl.conf for ages: #vfs.nfs.bufpackets=8 # 20050510: read 16 blocks instead of 8 #vfs.read_max=16 # 20060908: obsolete? #vfs.nfsrv.gatherdelay_v3=10000 And reverted to the system defaults: vfs.nfs4.nfsv3_commit_on_close: 0 vfs.nfs.bufpackets: 4 vfs.nfs.nfs_ip_paranoia: 1 vfs.nfs.nfs_directio_allow_mmap: 1 vfs.nfs.nfs_directio_enable: 0 vfs.nfs.clean_pages_on_close: 1 vfs.nfs.nfsv3_commit_on_close: 0 vfs.nfs.access_cache_timeout: 2 vfs.nfsrv.nfs_privport: 1 vfs.nfsrv.commit_miss: 0 vfs.nfsrv.commit_blks: 0 vfs.nfsrv.async: 0 vfs.nfsrv.gatherdelay_v3: 0 vfs.nfsrv.gatherdelay: 10000 Hope this helps, scs
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