FreeBSD 5.3 I/O Performance / Linux 2.6.10 | Continued Discussion

Mike Tancsa mike at
Thu Jan 27 18:45:28 PST 2005

At 08:14 PM 27/01/2005, Robert Watson wrote:
> >
> > My tests use the exact same disk layout, and hardware.  However, I have
> > had consistent results on all 4 boxes that I have tested on.

I am redoing mine so that I boot from a different drive and just test on 
one large RAID5 partition so that the layout is as consistent as possible

>I/O (reads, writes at fairly large multiples of the sector size -- 512k is
>a good number) and small I/O size (512 bytes is good).  This will help
>identify the source along two dimmensions: are we looking at a basic
>storage I/O problem that's present even without the file system, or can we
>conclude that some of the additional extra cost is in the file system code
>or the hand off to it.  Also, with the large and small I/O size, we can
>perhaps draw some conclusions about to what extent the source is a
>per-transaction overhead.

Apart from postmark and iozone (directly to disk and over nfs), are there 
any particular tests you would like to see done ?

Also, anyone know of a decent benchmark to run on windows ?  I want to test 
samba's performance on the 2 platforms as seen from a couple of Windows 


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