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Differential D56050

hwpmc.4: correct stale default values and update diagnostics
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Authored by paulo_nlink.com.br on Mar 23 2026, 5:11 PM.
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Details

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ali_mashtizadeh.com
gnn
mhorne
Commits
rG928091964581: hwpmc.4: correct stale default values and update diagnostics
rG2318ea10a3af: hwpmc.4: correct stale default values and update diagnostics
Summary

The default values documented for kern.hwpmc.logbuffersize (4KB) and
kern.hwpmc.nbuffers_pcpu (64) have been incorrect since 2981a3420cb1
(2018), which updated the compiled defaults but did not update the
man page.

  • Correct logbuffersize default from 4KB to 256KB, add 16MB maximum
  • Correct nbuffers_pcpu default from 64 to 32, document 32MB per-CPU product limit with kern.hwpmc.logbuffersize
  • Update DIAGNOSTICS section to reflect current warning messages

Sponsored by: NLINK (nlink.com.br)

Test Plan

Verified rendered output with:

man -l share/man/man4/hwpmc.4

mandoc -T lint shows only one pre-existing warning
(IMPLEMENTATION NOTES section order, not introduced by this patch).

Diff Detail

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rG FreeBSD src repository
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share/
man/
man4/
25 lines

Diff 174183

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share/man/man4/hwpmc.4

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