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Clarify FreeBSD instructions in pg_test_timing.
Josh Kupershmidt
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doc/src/sgml/pgtesttiming.sgml

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@@ -183,8 +183,13 @@ Histogram of timing durations:
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information about the timer selected during boot:
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<screen>
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dmesg | grep "Timecounter"
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sysctl kern.timecounter.hardware=TSC
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# dmesg | grep "Timecounter"
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Timecounter "ACPI-fast" frequency 3579545 Hz quality 900
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Timecounter "i8254" frequency 1193182 Hz quality 0
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Timecounters tick every 10.000 msec
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Timecounter "TSC" frequency 2531787134 Hz quality 800
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# sysctl kern.timecounter.hardware=TSC
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kern.timecounter.hardware: ACPI-fast -> TSC
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</screen>
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</para>
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@@ -277,7 +282,7 @@ Histogram of timing durations:
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</para>
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<para>
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Timers used on older PC hardware including the 8254 Programmable Interval
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Timers used on older PC hardware include the 8254 Programmable Interval
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Timer (PIT), the real-time clock (RTC), the Advanced Programmable Interrupt
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Controller (APIC) timer, and the Cyclone timer. These timers aim for
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millisecond resolution.

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