Wrong BogoMIPS on alpha

From: Bob McElrath (mcelrath@draal.physics.wisc.edu)
Date: Tue Sep 04 2001 - 10:13:18 EST

Recently the bogomips measurement has gone all haywire. Every once in a
while when I boot up the bogomips measurement will be absurly high (i.e.
5 Terahertz), with obvious associated problems. This happens in recent
kernels with both gcc-2.96-81 (redhat) and egcs-2.91.66. It does not
happen with early 2.4 kernels or 2.2 kernels. It does not happen all
the time. It never happens from a cold boot, and (almost) always
happens in a warm reboot. In particular, MILO (which is a stripped-down
linux 2.0 kernel that loads the real kernel) always measures the
bogomips correctly immediately before loading a new kernel that measures
it incorrectly.

The system is:
Alpha LX164 (21164 chip) at 600MHz
Kernels 2.4.7-2.4.9.

Cheers,
-- Bob

Bob McElrath (rsmcelrath@students.wisc.edu)
Univ. of Wisconsin at Madison, Department of Physics


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This archive was generated by hypermail 2b29 : Fri Sep 07 2001 - 21:00:26 EST