Messages in this thread | | | Date | Tue, 1 Dec 1998 12:40:54 -0500 | From | "Theodore Y. Ts'o" <> | Subject | Re: NTP dumps Linux, film at 11. [Fwd/FYI] |
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Date: Mon, 30 Nov 1998 17:48:18 -0500 From: "Brandon S. Allbery KF8NH" <allbery@kf8nh.apk.net>
What's involved? We use NTP quite a lot, especially for the Linux boxes (RH5 systems tend to drift a *lot* for some strange reason...
Well, one thing which I recently noticed is that if you're using a BusToaster SCSI PCMCIA card (great name, isn't it? :-) It's basically Adaptec 152x controller), and you run mke2fs -c on a JAZ drive, your clock will slow down an amazing amount --- over five minutes over the course of that single command (which was enough to make Kerberos complain about clock skew problems).
So there are at least a few device drivers which are apparently holding interrupts off long enough so that we lose a clock interrupt. Not good, and one of the reasons why any attempts to tweak the Linux scheduler to make it a "real-time system" simply elicits a smile from me..... oh, if only it were so easy! :-)
- Ted
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