diff options
| -rw-r--r-- | doc/src/sgml/pgtesttiming.sgml | 11 |
1 files changed, 8 insertions, 3 deletions
diff --git a/doc/src/sgml/pgtesttiming.sgml b/doc/src/sgml/pgtesttiming.sgml index 45ee80c23db..a2581d269c6 100644 --- a/doc/src/sgml/pgtesttiming.sgml +++ b/doc/src/sgml/pgtesttiming.sgml @@ -183,8 +183,13 @@ Histogram of timing durations: information about the timer selected during boot: <screen> -dmesg | grep "Timecounter" -sysctl kern.timecounter.hardware=TSC +# dmesg | grep "Timecounter" +Timecounter "ACPI-fast" frequency 3579545 Hz quality 900 +Timecounter "i8254" frequency 1193182 Hz quality 0 +Timecounters tick every 10.000 msec +Timecounter "TSC" frequency 2531787134 Hz quality 800 +# sysctl kern.timecounter.hardware=TSC +kern.timecounter.hardware: ACPI-fast -> TSC </screen> </para> @@ -277,7 +282,7 @@ Histogram of timing durations: </para> <para> - Timers used on older PC hardware including the 8254 Programmable Interval + Timers used on older PC hardware include the 8254 Programmable Interval Timer (PIT), the real-time clock (RTC), the Advanced Programmable Interrupt Controller (APIC) timer, and the Cyclone timer. These timers aim for millisecond resolution. |