[Bug 277992] mpr and possible trim issues

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=277992

--- Comment #6 from mike@sentex.net ---
OK, as suspected.  I stopped the test, reset the TRIM method to ATA_TRIM,
offlined the disk one by one and did a trim -f /dev/da[disk]p1 one by one and
resilvered the pool.  After that, I got normal performance for 3.5 iterrations
and then its back to being super slow on writes

Apr  8 14:39:47 r-14mfitest LOOP[21836]: starting
Apr  8 15:00:59 r-14mfitest LOOP[30713]: ending job ran 1272 seconds (0:21:12)
Apr  8 15:07:29 r-14mfitest LOOP[33450]: starting
Apr  8 15:28:54 r-14mfitest LOOP[42451]: ending job ran 1285 seconds (0:21:25)
Apr  8 15:31:55 r-14mfitest LOOP[43719]: starting
Apr  8 15:53:22 r-14mfitest LOOP[52716]: ending job ran 1287 seconds (0:21:27)
Apr  8 15:56:23 r-14mfitest LOOP[53996]: starting
Apr  8 16:18:03 r-14mfitest LOOP[63083]: ending job ran 1300 seconds (0:21:40)
Apr  8 16:21:04 r-14mfitest LOOP[64344]: starting
Apr  8 16:55:39 r-14mfitest LOOP[78807]: ending job ran 2075 seconds (0:34:35)
Apr  8 16:58:40 r-14mfitest LOOP[80073]: starting
Apr  8 17:56:56 r-14mfitest LOOP[4539]: ending job ran 3496 seconds (0:58:16)
Apr  8 17:59:57 r-14mfitest LOOP[5796]: starting

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