https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=253687

Mitchell Horne <[email protected]> changed:

           What    |Removed                     |Added
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           Assignee|[email protected]            |[email protected]
             Status|New                         |In Progress

--- Comment #7 from Mitchell Horne <[email protected]> ---
Created attachment 226244
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=226244&action=edit
Set proper nclasses value for Broadwell CPUs

(In reply to Zhenlei Huang from comment #6)

Thanks for the info. I believe I have identified the problem, but it would be
helpful if you could confirm the fix.

Please apply the attached patch to a checkout of the src tree, then, compile
and load the hwpmc module. There should be no need to build the kernel in its
entirety, it is enough to do:

# cd /path/to/freebsd-src
# make -C sys/modules/hwpmc
# make -C sys/modules/hwpmc install
# kldload /boot/modules/hwpmc.ko

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