On 06/14/2016 02:24 PM, Christoph Hellwig wrote:
On Tue, Jun 14, 2016 at 02:12:39PM -0400, Waiman Long wrote:
This patch enables reader optimistic spinning for inodes that are
under a DAX-based mount point.
On a 4-socket Haswell machine running on a 4.7-rc1 tip-based kernel,
the fio test with multithreaded randrw and randwrite tests on the
same file on a XFS partition on top of a NVDIMM with DAX were run,
the aggregated bandwidths before and after the patch were as follows:
And why is this specific to DAX? Many I/O operations already never
got out to disk, and ilock is mostly held for operations that have
nothing to do with disk I/O.
It is just a showcase for the rwsem change. We can certainly have more
use cases.
Cheers,
Longman
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