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From: dima <_pppp@mail.ru>
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	=?koi8-r?Q?Dennis_Kj=E6r_Jensen?= <signout@signout.dk>
Subject: Re[2]: Bad performance when accessing a lot of small files
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>> Increase the dirhash maxmem
>> I have 'sysctl -w vfs.ufs.dirhash_maxmem=268435456' (256Mb)in my
>> rc.local on a (maildir) fileserver here
>>
> This is a zfs filesystem, by the way I raise this limit as suggested.
> 
> I let you know

Can you provide
sysctl vfs.zfs output then?

ZFS can be tuned by increasing kern.maxvnodes sysctl (don't forget to increase vm.kmem_size and vm.kmem_size_max accordingly). Do it until vfs.numvnodes would stabilize below the kern.maxvnodes value during peak load patterns.