Date: Thu, 15 Jul 2004 13:00:38 -0600 From: Scott Long <scottl@freebsd.org> To: Daniel Lang <dl@leo.org> Cc: current@freebsd.org Subject: Re: tuning hints for PAE Message-ID: <40F6D456.2040007@freebsd.org> In-Reply-To: <20040715185801.GB7804@atrbg11.informatik.tu-muenchen.de> References: <20040715183415.GA7804@atrbg11.informatik.tu-muenchen.de> <40F6CF25.2040105@freebsd.org> <20040715185801.GB7804@atrbg11.informatik.tu-muenchen.de>
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Daniel Lang wrote:
> Hi Scott,
>
> Scott Long wrote on Thu, Jul 15, 2004 at 12:38:29PM -0600:
> [..]
>
>>Look at kern.maxvnodes and trim is down to a smaller amount if it's more
>>than about 100,000. This of course depends on your workload. If you
>>really need a lot of cached vnodes, then you'll need to tune elsewhere.
>
> [..]
>
> I was set to some value > 200000. I trimmed it down to 64000.
> Caches vnodes help if I access many different files concurrently?
>
> The machine hosts a heavy loaded ftp server, but I guess 200000
> is a very very high value. Is there some way to check the
> vnode cache utilization? Maybe with vmstat -m ....
>
> Thanks,
> Daniel
bash$ sysctl -a |grep vnode
kern.maxvnodes: 17806
vnodes 21 5K 5K 145 16,32,64,128,256
kern.minvnodes: 4451
vm.stats.vm.v_vnodein: 3930
vm.stats.vm.v_vnodeout: 0
vm.stats.vm.v_vnodepgsin: 25583
vm.stats.vm.v_vnodepgsout: 0
vfs.numvnodes: 16133
vfs.wantfreevnodes: 25
vfs.freevnodes: 8096
debug.sizeof.vnode: 260
The indented line is from kern.malloc and gives you an
estimate of how much memory is being consumed by the
vnode pool.
Scott
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