[Bug 277992] mpr and possible trim issues

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

--- Comment #10 from mike@sentex.net ---
Created attachment 250268
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=250268&action=edit
write performance of the tests

starting at 16:00 on the graph, I sent a series of zfs send | zfs recv of the
zfs data set and zfs destroy the copy. I pause for 120 seconds, then initiate a
manual trim zpool trim -w pool and then pause 120secs and then start again.  As
you can see the throughput is consistent on writes.  Then at 08:00 I restart
the test, but this time I dont do a trim after the zfs destroy.  If manages
about 3 times (the dataset is about a 1/3rd of the pool's capacity and then the
writes become brutally slow which tracks FreeBSD.  If I then do a zpool trim -w
pool, performance is back to normal.

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