[Bug 290207] [ZFS] lowering "vfs.zfs.arc.max" to a low value causes kernel threads of "arc_evict" to use 91% CPU and disks to wait. System gets unresponsive...

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=290207

--- Comment #13 from Nils Beyer <nbe@vkf-renzel.de> ---
(In reply to Mark Millard from comment #12)

hmm, these numbers does not seem to tell anything useful, I think:
---------------------------------- SNIP ---------------------------------- 
#vmstat -o | sort -nr -k5,5 -k1,1 -k10,10 -k9,9 | head
 2368     0     0     0  2368   1   0 WB  ph 
 1978     0     0     0  1978   3   0 WB  ph 
  200     0     0     0   200   3   0 WB  ph 
  148     0     0     0   148   3   0 WB  ph 
  101     0     0     0   101   3   0 WB  ph 
   68     0     0     0    68   3   0 WB  ph 
   66     0     0     0    66   1   0 WB  ph 
   51     0     0     0    51   3   0 WB  ph 
   47     0     0     0    47   3   0 WB  ph 
   45     0     0     0    45   3   0 WB  ph 

#rm -rf /usr/src.test

#vmstat -o | sort -nr -k5,5 -k1,1 -k10,10 -k9,9 | head
 2376     0     0     0  2376   1   0 WB  ph 
 1978     0     0     0  1978   3   0 WB  ph 
  200     0     0     0   200   3   0 WB  ph 
  148     0     0     0   148   3   0 WB  ph 
  101     0     0     0   101   3   0 WB  ph 
   68     0     0     0    68   3   0 WB  ph 
   66     0     0     0    66   1   0 WB  ph 
   51     0     0     0    51   3   0 WB  ph 
   47     0     0     0    47   3   0 WB  ph 
   45     0     0     0    45   3   0 WB  ph 
---------------------------------- SNIP ---------------------------------- 

Although wired has gone up to 1877MB. "src.test" is a copy of "src" that has
been done before a reboot...

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