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start [2020/06/12 15:58]
Ira Weiny [Filesystems]
start [2020/06/12 15:58] (current)
Ira Weiny [Filesystems]
Line 483: Line 483:
 ==== iostats ==== ==== iostats ====
 ---- ----
-iostats are disabled by default due to performance overhead (e.g., 12M IOPS dropping 25% to 9M IOPS). However, they can be enabled in sysfs if desired.  ​+iostats are disabled by default due to performance overhead (e.g., 12M IOPS dropping 25% to 9M IOP 
 +S). However, they can be enabled in sysfs if desired.  ​
  
 As of kernel 4.5, iostats are only collected for the base pmem device, not per-partition. Also, I/Os that go through DAX paths (rw_page, rw_bytes, and direct_access functions) are not counted, so nothing is collected for: As of kernel 4.5, iostats are only collected for the base pmem device, not per-partition. Also, I/Os that go through DAX paths (rw_page, rw_bytes, and direct_access functions) are not counted, so nothing is collected for:
start.txt · Last modified: 2020/06/12 15:58 by Ira Weiny