[ntp:questions] Re: linux system clock egregiously slow!

David Wuertele dave-gnus at bfnet.com
Thu Jan 22 04:07:19 UTC 2004

>> It says about 149MHz, which is what I expect.

Hal> Does the MIPS cycle counter count every other cycle?  If so, I'd
Hal> expect 150 rather than 149.  How close is your "which is what I
Hal> expect"?  Is it within a few PPM, or is it off enough to explain
Hal> what you are seeing?

It is actually 149605480.  I haven't done the math in a while, but
taking our actual CPU clock frequency into account it is within a few
PPM of two instruction cycles per counter increment.  Whereas the
linux system clock is closer to 800PPM slow!

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