Re: Clock rate on SGI's

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John W. Barrus (barrus++at++merl.com)
Wed, 3 Jul 96 14:04:13 EDT

>Turns out that this is a bug in IRIX 5.3 All Impact when running on certain
>models of the 250MHz R4400 CPU module. More specificaly, if your CPU module
>revision is:
>
>030-0808-001 RevE
>
>the cycle counter time will be reported as 32000 ps, whereas it should be 40000
>ps. This has been fixed under IRIX 6.2, which reports 40000. If your CPU module
>revision is:
>
>030-0937-001 RevA
>
>both 5.3 All Impact and 6.2 will report a cycle interval of 48000 ps, which
>appears to be correct.
>
>Found this out the hard way...
>

We found out the hard way also, but this doesn't explain the problem with
the indy who claims to have a number 45454 but is actually 45000 (see
earlier chart).

Same problem?

John B.

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