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diff --git a/share/man/man4/hwpmc.4 b/share/man/man4/hwpmc.4
--- a/share/man/man4/hwpmc.4
+++ b/share/man/man4/hwpmc.4
@@ -445,7 +445,8 @@
The size in kilobytes of each log buffer used by
.Nm Ns 's
logging function.
-The default buffer size is 4KB.
+The default buffer size is 256KB.
+The maximum value is 16MB.
.It Va kern.hwpmc.mincount Pq integer, read-write
The minimum sampling rate for sampling mode PMCs.
The default count is 1000 events.
@@ -453,10 +454,15 @@
The size of the spin mutex pool used by the PMC driver.
The default is 32.
.It Va kern.hwpmc.nbuffers_pcpu Pq integer, read-only
-The number of log buffers used by
+The number of log buffers per CPU used by
.Nm
for logging.
-The default is 64.
+The default is 32.
+The product of
+.Va kern.hwpmc.nbuffers_pcpu
+and
+.Va kern.hwpmc.logbuffersize
+must not exceed 32MB per CPU.
.It Va kern.hwpmc.nsamples Pq integer, read-only
The number of entries in the per-CPU ring buffer used during sampling.
The default is 512.
@@ -522,16 +528,23 @@
.It "hwpmc: tunable hashsize=%d must be greater than zero."
A negative value was supplied for tunable
.Va kern.hwpmc.hashsize .
-.It "hwpmc: tunable logbuffersize=%d must be greater than zero."
+.It "hwpmc: logbuffersize=%d must be greater than zero and less than or equal to %d, resetting to %d."
A negative value was supplied for tunable
.Va kern.hwpmc.logbuffersize .
-.It "hwpmc: tunable nlogbuffers=%d must be greater than zero."
+.It "hwpmc: nbuffers_pcpu=%d must be greater than zero, resetting to %d."
A negative value was supplied for tunable
-.Va kern.hwpmc.nlogbuffers .
+.Va kern.hwpmc.nbuffers_pcpu .
.It "hwpmc: tunable nsamples=%d out of range."
The value for tunable
.Va kern.hwpmc.nsamples
was negative or greater than 65535.
+.It "hwpmc: nbuffers_pcpu=%d * logbuffersize=%d exceeds %dMB per CPU limit, resetting to defaults (%d * %d)."
+The product of tunables
+.Va kern.hwpmc.nbuffers_pcpu
+and
+.Va kern.hwpmc.logbuffersize
+exceeds the maximum per-CPU memory limit.
+Both tunables are reset to their compiled defaults.
.El
.Sh DEBUGGING
The

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