Date: Fri, 10 Oct 2008 11:43:39 +0200 From: Laszlo Nagy <gandalf@shopzeus.com> To: Jeremy Chadwick <koitsu@FreeBSD.org> Cc: =?windows-1252?Q?Berta_S=E1ndor?= <berta@beco.hu>, Johan Hendriks <Johan@double-l.nl>, freebsd-questions@freebsd.org Subject: [SOLVED] Re: 7.1 hangs, shutdown terminated Message-ID: <48EF23CB.8020104@shopzeus.com> In-Reply-To: <20081010091738.GA27925@icarus.home.lan> References: <48EF14E1.9080808@shopzeus.com> <57200BF94E69E54880C9BB1AF714BBCB5DE18C@w2003s01.double-l.local> <48EF1C9C.3020201@shopzeus.com> <20081010091738.GA27925@icarus.home.lan>
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>>> If find / -sx is running and is consuming all CPU, what is the value of >>> vfs.ufs.dirhash_mem: >>> >>> # sysctl -a | grep dirhash >>> >>> >> shopzeus# sysctl -a | grep dirhash >> vfs.ufs.dirhash_docheck: 0 >> vfs.ufs.dirhash_mem: 2095818 >> vfs.ufs.dirhash_maxmem: 2097152 >> vfs.ufs.dirhash_minsize: 2560 >> >> >>> Make sure vfs.ufs.dirhash_mem: is not close to vfs.ufs.dirhash_maxmem: >>> >>> >> All right. It is close to it. Which one should I increase? I put this >> into /etc/sysctl.conf: >> >> >> vfs.ufs.dirhash_maxmem=8228608 >> >> Would it be scufficient? >> > > We don't know, and can't tell you. You'll have to monitor > vfs.ufs.dirhash_mem occasionally to see if you start to reach > vfs.ufs.dirhash_maxmem. > > I have a tendency to use vfs.ufs.dirhash_maxmem=16777216, which is > 16384*1024 (16MBytes). > > I'm not fully confident this is what's causing your problem, but it's > definitely a recommendation by Johan. > Thank you very much! Probably you are right. Our users use shared IMAP folders and sometimes they keep ten thousands of messages in one folder. I have increased dirhash_maxmem to 64MB and see what happens. Unfortunately, I cannot play with the hardware because it is in a server park, and it must be up 99.99% on workdays. I hope dirhash will solve the problem. I'm setting this to [SOLVED] and come back if it happens again. (Maybe on monday?) By the way, there is nothing in /etc/periodic that would execute "find / -sx". Can somebody explain what is this for, and why it was started by root? Is it being used instead for enumerating files in a directory, when dir hash is full? Thanks, Laszo
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