Re: ext4 extent status tree LRU locking

[Dave Hansen]

FWIW, I'm also seeing this contention to a much smaller extent on much
more "normal" hardware.  I've got a 6-core (as opposed to 80) desktop
machine where I'm doing the same test on a real disk (instead of a
loopback-mounted ramfs file).

I'm seeing _about_ 10% CPU time being used on just spinning on the same
ext4 LRU lock.
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