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Clarify FreeBSD instructions in pg_test_timing.

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Josh Kupershmidt
This commit is contained in:
Bruce Momjian 2012-08-30 18:38:00 -04:00
parent b5dc7612a5
commit c36b06a70d
1 changed files with 8 additions and 3 deletions
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11
doc/src/sgml/pgtesttiming.sgml
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@ -183,8 +183,13 @@ Histogram of timing durations:
information about the timer selected during boot: information about the timer selected during boot:
<screen> <screen>
dmesg | grep "Timecounter" # dmesg | grep "Timecounter"
sysctl kern.timecounter.hardware=TSC 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> </screen>
</para> </para>
@ -277,7 +282,7 @@ Histogram of timing durations:
</para> </para>
<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 Timer (PIT), the real-time clock (RTC), the Advanced Programmable Interrupt
Controller (APIC) timer, and the Cyclone timer. These timers aim for Controller (APIC) timer, and the Cyclone timer. These timers aim for
millisecond resolution. millisecond resolution.