Subject: Re: serial port silo overflow repair
To: Simon Burge <>
From: Jonathan Stone <jonathan@DSG.Stanford.EDU>
List: tech-kern
Date: 07/29/1997 03:28:53
Simon Burge writes:

>I was always under the impression that drift was very much based on the
>quality of the clock chip, and that this was reasonably variable.

Yes. That's one source of drift. Temperature variation is another.

But I thnk Erik is talking about drift due to jitter in the actual
sampling of the clock, due to unpredictable (and variable) interrupt
latency elsewhere in the system.

Perhaps, but not necessarily, the same interrupt latency that's biting
serial ports.

>From 10 different 5000/260's around here, I get these drifts:

Gee, some people have all the luck...