Date: Tue, 8 Sep 2009 12:19:45 +0200 From: Tobias Lott <tlott@gamesnet.de> To: freebsd-stable <freebsd-stable@freebsd.org> Subject: System crawls after Upgrade 7.0->7.2 Message-ID: <20090908121945.43ba3976@sub.han.vpn.gamesnet.de>
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Hey Everyone, I upgraded a Dual Core Machine to 7.2-Stable (2 Days ago), all OS related Stuff is located on an UFS Slice, Application is on a ZFS Volume. After the Upgrade everything seemed fine, but a User noticed one PHP Script which is basically loading a plain Textfile into Mysql times out. PHP Timeout was set to 60 secs, that was more then enough just one day before the upgrade. System-wise its like Mysql can't get get the data fast enough, process is max at 10% cpu usage most of the time in sbwait state. Haven't changed any sysctl (kern.maxvnodes="200000", vm.kmem_size="512M" vm.kmem_size_max="512M" vfs.zfs.arc_max="100M" but had those before already) or kernel parameter at that time. But according to the Wiki's ZFS Tuning Guide those aren't needed anymore so I tried without but no change there either. I checked the following (and the current used values each): maxproc maxfiles kern.ipc.somaxconn kern.ipc.nmbclusters Getting no error messages dmesg, syslog wise. Tried moving Mysql to the UFS Slice but same thing happens happens there. Some very basic testing like dd-ing: # dd if=/dev/da0 of=/dev/null bs=1024 count=1048576 1048576+0 records in 1048576+0 records out 1073741824 bytes transferred in 157.698602 secs (6808823 bytes/sec) FreeBSD hostname 7.2-STABLE FreeBSD 7.2-STABLE #3 r196954: Tue Sep 8 02:10:22 CEST 2009 root@hostname:/usr/obj/usr/src/sys/SPIRIT amd64 Since I upgraded the Machines zpool to version 13 already I don't really wanna go back to 7.0, but it seems the only way out atm. Hopefully someone can give me a Hint where maybe I forgot to check. Somehow it feels like the last Versions, I'd say starting with 7.x doesn't really feel that Rock-Stable as Versions Prior used to be. Prolly cause I'm using an Experimental Feature like ZFS, so no Offense nor Blame and this is not intended as a Flame or whatsoever! So don't get me wrong, I always liked, used, recommended FreeBSD since 4.0 and will continue to do so! Best Regards -- Tobias Lott
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