[ntp:questions] Re: TSC feacture

Ulrich Windl Ulrich.Windl at RZ.Uni-Regensburg.DE
Mon Sep 1 12:55:05 UTC 2003


"Xuehuan Li" <libryant at hotmail.com> writes:

> my ntpd runs on a PC104 CPU card. the CPU on the card is Cyric 486DX,
> and the kernel i compiled Do config as 486. but when i run the kernel
> on the card, it halted and printed
> kernel panic: kernel compiled for Pentium+, require TSC feature!
> does it mean the PPS patch can not run on the 486DX? BTW, in the
> kernel i patch another patch about the M-System's DOC driver(Disk On
> Chip).

The PPS stuff should still work, but the jitter is considerably higher
than with TSC. (The TSC is inside the CPU, but the timer chip is an
external device, causing extra delays to access it)

Regards,
Ulrich

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