kernel{acpi_task_*} consumes near 100% WCPU

[Sergey V. Dyatko]

Hi,

I have 2 SuperMicro servers with 11-CURRENT amd64 (r268447 and r292688).
Both have LA near 1.0 even without any load.
On 'fresh' CURRENT (r292688) top -SH command shows following with
debug.acpi.max_threads=8
 https://gyazo.com/5e16ffcf803a24171803209dba08848c 
with debug.acpi.max_threads=1 I have just one process kernel{acpi_task_0}
consumed 90%+ WCPU
systat -vmstat 1:  https://gyazo.com/b8be5305859b7245f6da16f92a1b2165

What is the reason for this behavior, and what can I do with this ?

--
wbr, tiger