Date: Mon, 14 Jun 1999 13:42:31 UTC-0700 From: Mark McCutcheon <mjmccut@cs.ubc.ca> To: freebsd-bugs@freebsd.org Subject: Re: kern/12022: System clock timewarps Message-ID: <"15666*mjmccut@cs.ubc.ca"@MHS>
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John A. Shue <John.Shue@symmetron.com> says: > It's not just P90s. > > My P100 is showing the same symptoms: > > The BIOS reports the chip as a 100MHz Pentium. > > dmesg says: > Timecounter "i8254" frequency 1193182 Hz > Timecounter "TSC" frequency 79001623 Hz > CPU: Pentium/P54C (79.00-MHz 586-class CPU) > Origin = "GenuineIntel" Id = 0x525 Stepping=5 > Features=0x1bf<FPU,VME,DE,PSE,TSC,MSR,MCE,CX8> For what it's worth, on a test network with 6 2+ year old PPro200 machines running FreeBSD v2.2.2 through 3.2-STABLE, any of them can come up with an erroneous clock frequency on any reboot. They don't have APM capable BIOSes. Normal report: FreeBSD 3.2-STABLE #3: Wed Jun 9 13:06:33 PDT 1999 <compilation information removed> Timecounter "i8254" frequency 1193182 Hz Timecounter "TSC" frequency 199739727 Hz CPU: Pentium Pro (199.74-MHz 686-class CPU) Origin = "GenuineIntel" Id = 0x619 Stepping=9 Features=0xf9ff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,SEP,MTRR,PGE,MCA,CMOV> but the TSC frequency has been seen to vary as low as 120MHz. More typically it would be around 180MHz. Rebooting usually results in the correct result; sometimes a second reboot is required. This never happened during the first 1.5 years of operation, but has become more frequent with time. No idea why this should appear to correlate with hardware age.... Mark McCutcheon | UBC High-Speed Networking | <mjmccut@cs.ubc.ca> To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-bugs" in the body of the message
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