SMP on FreeBSD 6.x and 7.0: Worth doing?
gemini at geminix.org
Wed Dec 26 12:29:55 PST 2007
Mike Tancsa wrote:
> At 08:11 AM 12/26/2007, Scott Long wrote:
>>> How does one know if the vfs.ufs.dirhash_maxmem is set too
>>> high and are exhausting KVA ?
>> Panics, freezes, failure to exec new programs, failure to create
>> pipes, etc.
> Is there anyway to know ahead of time one is getting close to the stage
> where all those "bad things" start to happen ?
At least on FreeBSD 4.11 you can do
sysctl -a|grep kvm
and get something like this:
Perhaps this works on later versions of FreeBSD, too.
Now, if vm.kvm_free drops to 10% or so of vm.kvm_size and continues to
fall, and vfs.ufs.dirhash_mem still hasn't hit the
vfs.ufs.dirhash_maxmem limit, it's time to get concerned. Of course,
you can also use the vm.kvm_* values to dimension vfs.ufs.dirhash_maxmem
properly in the first place.
Uwe Doering | EscapeBox - Managed On-Demand UNIX Servers
gemini at geminix.org | http://www.escapebox.net
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