Re: [BENCHMARK] EXT3 vs EXT2 results with rmap14a and testing with

[Andrew Morton]

Andreas Dilger wrote:
> 
> ...
> > Kernel                                        Time                    CPU
> > 2.4.20-pre7-rmap14a-xfs-uml-shawn12d            325.39                82%
> > 2.4.20-pre7-rmap14a-xfs-uml-shawn12d            411.47                64%
> 
> I don't see this as hugely surprising.  ext3 uses more CPU than ext2.
> If you are using up the CPU doing other things, then naturally ext3
> will take a longer wall-clock time to complete the same tasks as ext2.

Yup.  But here the CPU load is less; obviously some more seeking
was done.  That's fairly normal for ext3 - it has to write the journal
as well as the filesystem....
 
> I know that Andrew has been doing a bunch of work to reduce ext3 CPU
> usage/locking/etc., but I think that is all in 2.5 kernels.
> 

I had a little patch.  Stephen is working on the big fix.