Date: Tue, 18 May 1999 11:59:03 +0400 From: Dmitrij Tejblum <dima@tejblum.dnttm.rssi.ru> To: John Polstra <jdp@polstra.com> Cc: alpha@FreeBSD.org Subject: Re: Clock drift on the alpha Message-ID: <199905180759.LAA01124@tejblum.dnttm.rssi.ru> In-Reply-To: Your message of "Mon, 17 May 1999 18:44:04 PDT." <XFMail.990517184404.jdp@polstra.com>
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John Polstra wrote: > My alpha machine, which I suspect may be haunted, has pretty bad clock > drift. I started up xntpd, and the log messages will give you a sense > of how bad the drift is: > > May 17 09:46:41 alpha xntpd[375]: xntpd version=3.4e (beta multicast); Sun May 16 11:27:50 PDT 1999 (1) > May 17 09:46:41 alpha xntpd[375]: tickadj = 5, tick = 976, tvu_maxslew = 5115 > May 17 09:46:41 alpha xntpd[375]: using xntpd phase-lock loop > May 17 09:52:00 alpha xntpd[375]: time reset (step) -1.661376 s > May 17 09:58:23 alpha xntpd[375]: time reset (step) -0.906801 s > May 17 10:04:47 alpha xntpd[375]: time reset (step) -0.906982 s > May 17 10:11:10 alpha xntpd[375]: time reset (step) -0.907095 s > May 17 10:17:33 alpha xntpd[375]: time reset (step) -0.907238 s > May 17 10:23:56 alpha xntpd[375]: time reset (step) -0.906743 s > May 17 10:30:19 alpha xntpd[375]: time reset (step) -0.907094 s > ... > > (It doesn't do any better if I use the kernel PLL.) > > Is this a common problem? My dmesg output is below. Exactly same here. > > Also, is xntpd broken on the alpha? It has been running nonstop on > this machine for 8 hours, and it has written a drift file. But the > file contains "0.000 0", which is clearly wrong. I think, xntpd just cannot deal with the huge drift. > EB164 > Digital AlphaPC 164LX 533 MHz, 531MHz > 8192 byte page size, 1 processor. > CPU: EV56 (21164A) major=7 minor=2 extensions=0x1<BWX> My alpha is pretty much the same, except it is 164SX rather than LX (and the CPU is 21164PC). Note that if the clock frequency was set to 533MHz, not to 531, the drift appatrently would be much better. It may be a quirk in the alpha hardware or firmware. Dima To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-alpha" in the body of the message
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