From owner-freebsd-performance@FreeBSD.ORG  Fri Sep 29 16:13:09 2006
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Date: Fri, 29 Sep 2006 12:13:36 -0400
From: Mike Jakubik <mikej@rogers.com>
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To: Olivier Cochard-Labbe <olivier@freenas.org>
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Cc: freebsd-performance@freebsd.org
Subject: Re: Samba Performance problem
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Olivier Cochard-Labbe wrote:
> Hi all,
>
> I meet a performance problem with my customized distro of FreeBSD 
> 6.1(FreeNAS).
> Lot's of FreeNAS users compare the performance of FreeNAS with Linux, and
> the Samba performance are very poor under FreeNAS (but not with NFS or 
> FTP).
>
>
...
> But there is no change too... How can I improve the Samba performace ?

Basically, you can't. Samba has always lacked in performance on FreeBSD, 
it has been discussed many times and AFAIK no solution has been found. 
You can also try adding these to smb.conf.:

use sendfile = yes
strict locking = no