请教unix服务器上xntpd服务的一个参数问题

请教unix服务器上xntpd服务的一个参数问题

-x, --slew
Slew up to 600 seconds.
Normally, the time is slewed if the offset is less than
the step threshold, which is 128 ms by default, and
stepped if above the threshold. This option sets the
threshold to 600 s, which is well within the accuracy
window to set the clock manually. Note: Since the slew
rate of typical Unix kernels is limited to 0.5 ms/s,
each second of adjustment requires an amortization
interval of 2000 s. Thus, an adjustment as much as 600
s will take almost 14 days to complete. This option
can be used with the -g and -q options. See the tinker
configuration file directive for other options. Note:
The kernel time discipline is disabled with this
option.

加了-x后,用SLEW的方式调整同步时间，每秒钟调整0.5ms，调整一秒钟需要2000秒钟完成，上面的例子，调整600s需要大概14天完成（Thus, an adjustment as much as 600s will take almost 14 days to complete），即算一下，600x2000=1200000秒=13.89天，即差不多14天。