On Fri, 2009-04-03 at 08:07 -0700, Linus Torvalds wrote:
Even the intel ones have cliffs for long running random io workloads
(where the bottom of the cliff is still very fast), but something like
this should be stable.
The buffer heads do end up on the block device inode's pages, and ext3
is letting pdflush do some of the writeback. Its hard to say if the
sync_file_range is going to help, the IO on the metadata may be random
enough for that ssd that it won't really matter who writes it or when.
Spinning disks might suck, but at least they all suck in the same
way...tuning for all these different ssds isn't going to be fun at all.