Re: Hardware Clock
Re: Hardware Clock
- Subject: Re: Hardware Clock
- From: "Gerriet M. Denkmann" <email@hidden>
- Date: Sat, 8 Jul 2006 13:00:54 +0200
On 08.07.2006, at 08:48, Ed Wynne wrote:
On Jul 8, 2006, at 1:38 AM, Gerriet M. Denkmann wrote:
The problem: whenever (B) is initialized from (A) a random value
in the range -0.5 ... +0.5 seconds is added to the time.
To test: make the time (B) equal to the correct wall clock time.
Sleep. Awake. Compare time to wall clock. See difference of
-0.5 ... +0.5 seconds.
The hardware clock is probably only second accurate and its likely
the OS only samples it once, instead of polling for the next second
increment. This would save about .5s (on average) from the wakeup
time.
Yes; further proof for this is the fact that the system time after
awakening always starts with a full second (no fractional part).
But: if the OS can poll the hardware clock, why can't I?
Gerriet.
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