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Since kernel 2.6.20, the software clock can also be 300 HZ.

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Michael Kerrisk 2007-02-02 05:41:32 +00:00
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@ -73,6 +73,9 @@ starting with 2.6.0, HZ was raised to 1000, giving a jiffy of
0.001 seconds; since kernel 2.6.13, the HZ value is a kernel
configuration parameter and can be 100, 250 (the default) or 1000,
yielding a jiffies value of, respectively, 0.01, 0.004, or 0.001 seconds.
Since kernel 2.6.20, a further frequency is available:
300, a number that divides evenly for the common video
frame rates (PAL, 25 HZ; NTSC, 30 HZ).
.SS "The Epoch"
Unix systems represent time in seconds since the
.IR Epoch ,