Re: ext2/3 performance regression in 2.6 vs 2.4 for small interleavedwrites

[Rik van Riel]

On Wed, 11 Feb 2004, Jon Burgess wrote:

> Write speed in MB/s using an ext2 filesystem for 1 and 2 streams:
> Num streams:     1      2
> linux-2.4.22   10.47  6.98
> linux-2.6.2     9.71  0.34

> During the disk light is on solid and it really slows any other disk 
> access. It looks like the disk is continuously seeking backwards and 
> forwards, perhaps re-writing the meta data.

Just for fun, could you also try measuring how long it takes
to read back the files in question ?

Both individually and in parallel...

--
"Debugging is twice as hard as writing the code in the first place.
Therefore, if you write the code as cleverly as possible, you are,
by definition, not smart enough to debug it." - Brian W. Kernighan

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