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To: Ivan Voras <ivoras@freebsd.org>
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Date: Sun, 21 Mar 2010 21:55:59 -0700
From: Kirk McKusick <mckusick@mckusick.com>
Cc: freebsd-fs@freebsd.org
Subject: Re: UFS files in a directory limit? 
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> To: freebsd-fs@freebsd.org
> From: Ivan Voras <ivoras@freebsd.org>
> Date: Mon, 22 Mar 2010 01:08:31 +0100
> Subject: UFS files in a directory limit?
> 
> hi,
> 
> What is the limit on the number of files in a directory on UFS? I always 
> thought it is 32,767 (or near it) but now I see several directories on a 
> server with more than 36,000 files (yes it's inefficient, that's not the 
> point).

The only limit on the size of a directory is the number of files that
you can have in the filesystem. There is a limit of 2^16 directories
within a directory due to the limit on the number of hard links.

> On a similar topic, I presume there are no unexpected problems with 
> increasing vfs.ufs.dirhash_mem to ridiculous amounts like 100 MB? :)

The only issue with making vfs.ufs.dirhash_mem very large is that
you may exhaust the address space available to your kernel.

	Kirk McKusick