Re: HEADSUP: ntp4 to replace xntpd

[Warner Losh]

In message <[EMAIL PROTECTED]> Nate Williams writes:
: You may not know the answer to this, but it's worth a shot.  Wht kind of
: accuracy can we expect using 'cheap' off-the-shelf GPS receivers?

We're getting, with ntp4 on a 3.x kernel, about +- 4uSec with a cheap
gps receiver + atomic clock on a i486 class machine.  The clock
doesn't want to sync more closely than that, likely due to the large
jitter in the 8254 timing device, so the atomic clock is a bit of a
waste for this part of our application (there are others it is needed
for).  With a pentium class machine and w/o the atomic clock
"backing", I'd say you could easily get into the sub-micro second
range.

Warner


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