RE: Time synchronization between two LINUX computer

RE: Time synchronization between two LINUX computer

[David Schwartz]

> I would think so since, for instance, file date/times don't have much
> resolution. However, the original inquiry implied microsecond resolution
> time-difference between machines.

	On my home LAN, I have quite a few machines running NTP. Here's what a
'xntpdc -p' looks like on one of 'em:

       st poll reach  delay   offset    disp
=======================================================================
+ A     2 1024  377 0.00050 -0.004370 0.00218
= B     1  256  377 0.00020  0.000176 0.00006
- C     2   64   36 0.00861  0.000055 1.93866
* D     1  128  377 0.00018  0.000174 0.00005
- E     2   64   16 0.00032  0.001583 1.93872
- F     2  256  377 0.00844  0.000222 0.00333
- G     2  512  367 0.00069 -0.000021 0.06850
+ H     2  256  377 0.00334  0.000112 0.00545
- I     2  512  377 -0.0150 -0.008419 0.01424

	A is an Irix machine on my LAN. B is a local stratum one public time
server. C is a customer's machine on a remote WAN. D is a local stratum one
public time server. E is a FreeBSD 3 box on my LAN (SMP. FreeBSD SMP doesn't
keep very good time). F is a customer's machine on a remote WAN. G is my
UltraSparc. H is my local Cisco router. I is a Windows 98 box. The machine I
ran this on is a Linux box.

	You'll notice that <1ms resolution is possible between Linux and FreeBSD UP
machines with recent kernels.

	DS


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