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From: Max Laier <max@love2party.net>
Organization: FreeBSD
To: freebsd-hackers@freebsd.org
Date: Sat, 5 Jun 2010 19:30:49 +0200
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Cc: Adam PAPAI <wooh@wooh.hu>, freebsd-questions@freebsd.org
Subject: Re: sysbench / fileio - Linux vs. FreeBSD
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On Saturday 05 June 2010 01:58:35 Adam PAPAI wrote:
> Why FreeBSD is supreme with 1 and 2 thread. And why is it 2 and 3 times
> slower with 4-8-16-32 threads compared to Debian? The first two tests (1
> thread and 2 thread) showed me that FreeBSD is supreme in I/O, but later
> tests showed me, that it can produce horrible I/O.
> 
> How can I tune my disk to make it faster? Is it possible? What is the
> reason of the really slow I/O with more than 4 threads? What do you
> recommend me to do? Why is it damn slow with 8K blocksize?

You may find this interesting:

http://info.iet.unipi.it/~luigi/geom_sched/

Regards,
  Max