Howard Chu, on 11/01/2012 08:38 PM wrote:
Alan Cox wrote:
How about that recently preliminary infrastructure to send ORDERED commands
instead of queue draining was deleted from the kernel, because "there's no
difference where to drain the queue, on the kernel or the storage side"?
Send patches.
Isn't any type of kernel-side ordering an exercise in futility, since
a) the kernel has no knowledge of the disk's actual geometry
b) most drives will internally re-order requests anyway
c) cheap drives won't support barriers
This is why it is so important for performance to use all storage capabilities.
Particularly, ORDERED commands instead of trying to pretend be smarter, than the
storage, doing queue draining.
Vlad
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