[Bug 237807] ZFS: ZVOL writes fast, ZVOL reads abysmal...

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=237807

--- Comment #11 from Nils Beyer <nbe at renzel.net> ---
increasing concurrency doesn't help:
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Version  1.97       ------Sequential Output------ --Sequential Input- --Random-
Concurrency  16     -Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks--
Machine        Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP  /sec %CP
veeambackups 64G   156  99 496023  58 117847  21     5   8 40116   8 942.0  17
Latency             54528us     315ms     293ms    1579ms   81741us   74544us
Version  1.97       ------Sequential Create------ --------Random Create--------
veeambackups -Create-- --Read--- -Delete-- -Create-- --Read--- -Delete--
              files  /sec %CP  /sec %CP  /sec %CP  /sec %CP  /sec %CP  /sec %CP
                 16 +++++ +++ +++++ +++ 16878  56 +++++ +++ +++++ +++ 31661  99
Latency              2501us      43us     423ms    2225us      38us      91us
1.97,1.97,veeambackups,16,1565363711,64G,,156,99,496023,58,117847,21,5,8,40116,8,942.0,17,16,,,,,+++++,+++,+++++,+++,16878,56,+++++,+++,+++++,+++,31661,99,54528us,315ms,293ms,1579ms,81741us,74544us,2501us,43us,423ms,2225us,38us,91us
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