Re: measured throughput variations

["Stephen C. Tweedie" <sct redhat com>]

Hi,

On Fri, Jun 21, 2002 at 05:29:31PM +0200, chacron1 wrote:

> Then, a new session found very different results: 8 MB/s throughput
> and iostat showed near 0 block read / s and 17000 block write /s !!
> 
> How is it possible that ext3 needs sometime to read as many data as it
> writes and sometime it doesn't need to read anything ?

Cache effects?  It would depend on whether you had enough free cache
memory to completely cache the results from the previous run.

--Stephen