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 -- To unsubscribe from this list: send the line "unsubscribe linux-ia64" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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