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Date: Sat, 5 Jun 2010 12:04:05 +0100
From: Bruce Cran <bruce@cran.org.uk>
To: Stefan Miklosovic <miklosovic.freebsd@gmail.com>
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Cc: freebsd-hackers@freebsd.org, freebsd-questions@freebsd.org,
	Adam PAPAI <wooh@wooh.hu>
Subject: Re: sysbench / fileio - Linux vs. FreeBSD
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On Sat, 5 Jun 2010 12:50:15 +0200
Stefan Miklosovic <miklosovic.freebsd@gmail.com> wrote:

> > /var : ufs with softupdates
> > /usr/obj : zfs with checksums disabled
> > /usr/src : zfs with compression enabled
> > /home   : zfs with compression disabled and checksums enabled
> >
> > I ran a test with a blocksize of 8KB and 16 threads.
> >
> > /var       : 25.2MB/s
> > /usr/obj : 64.8MB/s
> > /usr/src : 386.3MB/s
> > /home   : 60.3MB/s
> 
> Do I understand it well? It seems that zfs with compression enabled on
> /usr/src with 8KB block size and 16 threads performs 386.3MB/s which
> is about 6 times better than debian5? I am thinking about this image
> http://tech-blog.wooh.hu/~wooh/debian_vs_freebsd_io_16_seqwr.png

Yes - on one run it even hit 500MB/s. I suspect, however, that the
benchmark isn't accurate because it won't be writing typical data.
Instead it's probably using a buffer that compresses very well.

-- 
Bruce Cran