Il 08/07/2013 15:59, Jan Kara ha scritto:
On Mon 08-07-13 22:44:53, Dave Chinner wrote:
<snipped some nice XFS results ;)>
So, lets look at ext4 vs btrfs vs XFS at 16-way (this is on the
3.10-cil kernel I've been testing XFS on):
create walk unlink
time(s) rate time(s) time(s)
xfs 222 266k+-32k 170 295
ext4 978 54k+- 2k 325 2053
btrfs 1223 47k+- 8k 366 12000(*)
(*) Estimate based on a removal rate of 18.5 minutes for the first
4.8 million inodes.
Basically, neither btrfs or ext4 have any concurrency scaling to
demonstrate, and unlinks on btrfs a just plain woeful.
Thanks for posting the numbers. There isn't anyone seriously testing ext4
SMP scalability AFAIK so it's not surprising it sucks.
Funny, if I well remember Google guys switched android from yaffs2 to
ext4 due to its superiority on SMP :)
Marco
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