Hal Murray wrote:
Yes, mostly.
PCs have two nasty disadvantages in terms of time keeping.
One is that the CPU clock is typically using spread spectrum to make the EMI
shielding (a lot) easier.
The other is that the temperature at the crystal depends (a lot) on what the
CPU is doing.
These are both problems, but the biggest issue in reducing jitter often
is minimizing SMM[1]. Some SMI's can suck up 50 us at a go though most
are less. On some platforms you may see SMI's executing at a rate of
more than 1 Hz.
-ch
[1] http://en.wikipedia.org/wiki/System_Management_Mode
_______________________________________________
time-nuts mailing list -- [email protected]
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
