Messages in this thread | | | Date | Mon, 14 Sep 2015 13:06:25 -0700 | Subject | Re: [PATCH] fs-writeback: drop wb->list_lock during blk_finish_plug() | From | Linus Torvalds <> |
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On Sun, Sep 13, 2015 at 4:12 PM, Dave Chinner <david@fromorbit.com> wrote: > > Really need to run these numbers on slower disks where block layer > merging makes a difference to performance.
Yeah. We've seen plugging and io schedulers not make much difference for high-performance flash (although I think the people who argued that noop should generally be used for non-rotating media were wrong, I think - the elevator ends up still being critical to merging, and while merging isn't a life-or-death situation, it tends to still help).
For rotating rust with nasty seek times, the plugging is likely to make the biggest difference.
Linus
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