Re: Test results for ext4

[Eric Sandeen <sandeen@redhat.com>]

Valerie Clement wrote:
> Hi all,
> 
> Since a couple of weeks, I did batches of tests to have some performance
> numbers for the new ext4 features like uninit_groups, flex_bg or
> journal_checksum on a 5TB filesystem.
> I tried to test allmost all combinations of mkfs and mount options, but
> I put only a subset of them in the result tables, the most significant
> for me.
> 
> I had started to do these tests on a kernel 2.6.26-rc1, but I'd got several
> hangs and crashes occuring randomly outside ext4, sometimes in the slab
> code or in the scsi driver eg., and which were not reproductible.
> Since 2.6.26-rc2, no crash or hang occur with ext4 on my system.
> 
> The first results and the test description are available here:
> http://www.bullopensource.org/ext4/20080530/ffsb-write-2.6.26-rc2.html
> http://www.bullopensource.org/ext4/20080530/ffsb-readwrite-2.6.26-rc2.html

To be fair in your comparisons with xfs, you should probably either turn
barriers off for xfs, or on for ext[34], just FWIW.

-Eric