Re: [benchmark] seek optimization

[Jens Axboe <axboe@suse.de>]

On Wed, Jul 14 2004, Szakacsits Szabolcs wrote:
> 
> On Wed, 14 Jul 2004, Bryan Henderson wrote:
> 
> > A simpler experiment where you copy a file from a filesystem into
> > oblivion would eliminate any seeks or other delays on the write side
> > and any interaction between the two and leave just the seeks on the
> > read side to measure.
> 
> The intention was to point out seek elimination on the writer side ;-)
>  
> > And that information seems like it would be more useful.  Many
> > applications simply read and use data; they don't copy it into another
> > file
> 
> Sure, and many other different kind of tests would be more useful, too.  
> But this experiment wasn't about those. Instead to point out, by a
> relatively common tool in a common environment, that
> 
>    1) The seek elimination of Reiser4 is true and quite well measurable.
>       Also its seek optimization is much better than any other major
>       filesystem's optimization on Linux.
> 
>    2) Apparently the 2.6 kernel's IO scheduler has a performance problem.

Which one did you test?

-- 
Jens Axboe