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From: Borja Marcos <BORJAMAR@SARENET.ES>
Date: Tue, 15 Mar 2005 16:55:32 +0100
To: Marc Olzheim <marcolz@stack.nl>
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cc: freebsd-performance@freebsd.org
Subject: Re: vfs.ufs.dirhash_maxmem is a bit low
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On 15 Mar 2005, at 16:47, Marc Olzheim wrote:

> On Tue, Mar 15, 2005 at 04:32:09PM +0100, Dennis Berger wrote:
>> My request can we add white kernel message for the behavier of 
>> running out of hashmemory? I'd say stuff it in tuning(7)...

	My rule of thumb is: In case you have a machine with lots of huge 
directories (which is _not_ the same as lots of files), in case you see 
that vfs.ufs.dirhash_mem is very similar to vfs.ufs.dirhash_maxmem, 
increase vfs.ufs.dirhash_maxmem until you cannot fill it.

	It's a radical approach, but it gave me very good results in an imap 
server with lots of maildir folders. Of course, be sure not to run out 
of memory. Run vmstat and check the "sr" column.




	Borja.