[Bug 277992] mpr and possible trim issues

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

--- Comment #5 from mike@sentex.net ---
Created attachment 249831
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=249831&action=edit
charting write throughput (90 second pauses between tests)

Good news / bad news. The test continued through the night without causing any
errors, however it is getting progressively slower.  From the disks being
fresh, it would take about 20min. Now the same test takes about 2hrs

I let it run overnight and each iteration got longer and longer
Apr  8 00:10:45 r-14mfitest LOOP[57086]: ending job ran (1:21:6)
Apr  8 00:12:16 r-14mfitest LOOP[57737]: starting
Apr  8 01:41:51 r-14mfitest LOOP[95255]: ending job ran (1:29:35)
Apr  8 01:43:21 r-14mfitest LOOP[95888]: starting
Apr  8 03:57:36 r-14mfitest LOOP[52511]: ending job ran (2:14:15)
Apr  8 03:59:06 r-14mfitest LOOP[53144]: starting
Apr  8 05:57:41 r-14mfitest LOOP[2987]: ending job ran (1:58:35)

the 3am one was probably an extra 15min due to various daily cron jobs running.
But you can see the initial test that worked with decent write speed from the
attached graph. Then the crash of the disk. I then disable TRIM and try again,
but its slower and slower

I have a feeling if I do a trim -f da[each disk]p1 one by one and resilver, it
will then be fast again on writes for a bit

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