Messages in this thread | | | From | (Erik Mouw) | Subject | Re: Wrong bogomips after plugging in AC power | Date | Sun, 31 Oct 1999 11:41:39 +0100 (CET) |
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Vladimir Dergachev wrote: > > On Sat, 30 Oct 1999, Scott Marlowe wrote: > > No, bogomip calculation is too expensive to do during a running kernel. At > > yes and no. It is probably too expensive to run every minute - yes. > But it takes less time than initialization of scsi bus (that happens after > you do insmod or some error occurs).
Does a SCSI bus initialization hold the complete system? Calculating bogomips does.
> Face it - changing cpu speed is a _change_ in system configuration. > > Also can someone remind me what rdtsc does ? I thought it counted clock > cycles. The point of bogomips calculation is to find out how many cycles > in a second there really are. > > The other clock source might be memory bus - anyone heard of memory bus > changing speed on the fly ?
Yes, but not on a PC. On the StrongARM SA-1100 the memory bus speed is derived from the CPU core speed. Changing the core speed also means that you have to reprogram the DRAM timing registers.
Erik
-- J.A.K. (Erik) Mouw, Information and Communication Theory Group, Department of Electrical Engineering, Faculty of Information Technology and Systems, Delft University of Technology, PO BOX 5031, 2600 GA Delft, The Netherlands Phone: +31-15-2785859 Fax: +31-15-2781843 Email J.A.K.Mouw@its.tudelft.nl WWW: http://www-ict.its.tudelft.nl/~erik/
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