diff options
| -rw-r--r-- | share/man/man4/hwpmc.4 | 25 |
1 files changed, 19 insertions, 6 deletions
diff --git a/share/man/man4/hwpmc.4 b/share/man/man4/hwpmc.4 index 54a251dcca76..8bb1cb96f694 100644 --- a/share/man/man4/hwpmc.4 +++ b/share/man/man4/hwpmc.4 @@ -441,7 +441,8 @@ The default is 16. 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. @@ -449,10 +450,15 @@ The default count is 1000 events. 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. @@ -518,16 +524,23 @@ was not configured with the required configuration option .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 |