On Thu, 21 Jan 1999, Peter Bartosch wrote: > > On 19-Jan-99, Peter Bartosch took time to write : > > >> bogomips should only depend on hardware no ? > > > > > > only on cpu (and clock) > > > > that's what i thought too, but it doesn't seem true in my case > > as with exactly the same hardware and no change in bios > > i have > > 700 bogomips with kernel 2.2.0pre7 > > and 350bogomips with kernel 2.0.36 compiled either as 586 or as 686 > > > > they are all compiled with same options (as much as possible) > > i've read somewhere, that this lies on the size of the cpu's cache (1st > level) this is IIRC in K6-chips twice as big as in pentiums, but if i think > over it this couldn't be true/realistic
Actually, the main critique of the real MIPS calculation is that it is cache-dependent because it is a small loop. While I know nothing of the bogomips calculation, I assume it's similar. The problem is that the entire piece of code that calculates this fits inside the cache. Pentiums (and MMX) came standard w/ 512k, so I doubt the loop would be bigger than that, so I don't think doubling the cache size would help any. (Just celerons would really get bad numbers) :) -Dan