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On Sun, 1 Dec 2002 00:30, Thomas Kirk wrote:
> On Fri, Nov 29, 2002 at 05:07:16PM +0100, Nicolas Bougues wrote:
> > You should probably try to time the disk reads, not the buffer cache...
> >
> > hdparm -t
> Yes the disk reads is a more realistic real world test :
> /dev/sda5:
>  Timing buffer-cache reads:   128 MB in  1.23 seconds =104.07 MB/sec
> guf:~# hdparm -t /dev/sda5

hdparm is NOT a real world test!

In real world operation you use a file system not direct access to the device.  
Bonnie++ is one of many file system benchmarks that you can use to get 
results that are more useful than hdparm.

If you want to look at the performance of a raw device then use zcav (part of 
Bonnie++), it allows you to easily graph the varying performance across a 

http://www.coker.com.au/selinux/   My NSA Security Enhanced Linux packages
http://www.coker.com.au/bonnie++/  Bonnie++ hard drive benchmark
http://www.coker.com.au/postal/    Postal SMTP/POP benchmark
http://www.coker.com.au/~russell/  My home page

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