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

[Michael Frank]

On Thursday 12 February 2004 04:28, Rik van Riel wrote:
> 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...
> 

2.4 has a deadline scheduler. 2.6 default is anticipatory.

Could you please boot with scheduler=deadline to compare apples with apples.

Regards
Michael


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