about ufs filesystem io performance!

[etalk etalk]

>From: Kris Kennaway <kris at obsecurity.org>
>To: etalk etalk <yanyuejin2004 at hotmail.com>
>CC: freebsd-fs at freebsd.org, freebsd-performance-request at freebsd.org
>Subject: Re: about ufs filesystem io performance!
>Date: Thu, 25 May 2006 17:58:10 -0400
>
>On Thu, May 25, 2006 at 08:12:42PM +0800, etalk etalk wrote:
> > 5.3 vs 6.0
> > The test tool is Iozone3_257, and the test command is ??./iozone -A -f
> > /mnt/tmpfile.test -g 1g -n 1m -q 8k -y 2k -R -b outfile-Af.xls ??
> > (http://www.iozone.org/src/current/). We ran all the tests on the same 
PC
> > with 2.4 GHz Pentium CPU and 512M main memory. Figure1~Figure5 show the
> > results of the file system performance comparison between Bsd5.3??s 
UFS2
> > and Bsd6.0??s UFS2 when testing with different file system (local, 
sync,
> > async, softupdate, sync+softupdate).
> >
> > According to the figures, our conclusion is:
> > On all kinds of file systems, the write, rewrite, read and reread
> > performance of the two is almost same and we cant say that Bsd6.0 make 
a
> > improvement on file system IO performance.
>
>Very unlikely, since the former is giant locked and the latter not.  I
>saw a performance improvement of up to a factor of 7 in favour of 6.0
>when I tested concurrent I/O.
>
>http://people.freebsd.org/~kris/bsdcan/Filesystem%20Performance.pdf
>
>If this is truly what you're seeing, then you're probably hitting some
>other bottleneck and not actually testing filesystem performance.
>
>Kris

I can not see the pdf file,and how can i test concurrent I/O in 5.3 vs 6.0, 
is there some tools or patch?
><< attach3 >>

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