Eric Sandeen wrote:
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.
Oops, I did the test on a device mapper /dev/md0. I forgot to change it in
the test description. I will do it.
When mounting the xfs filesystem, I've got the following message:
Filesystem "md0": Disabling barriers, not supported by the underlying device
It means barriers are not supported by my device, isn' it?
Valérie
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