RE: [benchmark] seek optimization

[Szakacsits Szabolcs <szaka@sienet.hu>]

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.

	Szaka