Re: cpu arch performance
Hello Lee, On Tue, 23 May 2000, Lee Elliott wrote: Hello list(s), Just something I noticed after setting up an x86 system after running Debian on m68k. The m68k system was an Amiga with an m68060/50MHz which gave a BogoMIP rating of 99.something. The x86 system is a dual PIII 650MHz system and it rates as 2600 BogoMIPs. This would seem to imply that on a per MHz basis, the m68060 is the equivalent of two PIIIs. This is right. AFAIK, the hardware side of the issue goes something like this: One phase of the clock signal looks something like this: Voltage high ||| low ||| The x86 Processors will issue a command whenever the signal voltage is high. The m68k processors will issue a command whenever the signal voltage is high and the next when it's low (Motorola claims, that the 68060 issues three commands per clock cycle, I don't know why you then don't get three times the MIPS value of a x86 on a per MHz basis. I also don't know if the above mentioned holds true for Pentium and upwards. But it holds true for 386 and 486). This is why a m68k processor is on a per MHz basis really twice as fast as a x86 processor. Regards, Daniel
Re: cpu arch performance
On Tue, 23 May 2000, Lee Elliott wrote: Hello list(s), Just something I noticed after setting up an x86 system after running Debian on m68k. The m68k system was an Amiga with an m68060/50MHz which gave a BogoMIP rating of 99.something. The x86 system is a dual PIII 650MHz system and it rates as 2600 BogoMIPs. This would seem to imply that on a per MHz basis, the m68060 is the equivalent of two PIIIs. This is right. AFAIK, the hardware side of the issue goes something like this: One phase of the clock signal looks something like this: Voltage high ||| low ||| The x86 Processors will issue a command whenever the signal voltage is high. The m68k processors will issue a command whenever the signal voltage is high and the next when it's low (Motorola claims, that the 68060 issues three commands per clock cycle, I don't know why you then don't get three times the MIPS value of a x86 on a per MHz basis. I also don't know if the above mentioned holds true for Pentium and upwards. But it holds true for 386 and 486). This is why a m68k processor is on a per MHz basis really twice as fast as a x86 processor. Regards, Daniel - The AMD K6 also gives about 2x the clock in bogo mips. Not sure about the K7/Athlon though. = Amateur Radio, when all else fails! http://www.qsl.net/wa2mze Debian Gnu Linux, Live Free or . __ Do You Yahoo!? Kick off your party with Yahoo! Invites. http://invites.yahoo.com/
cpu arch performance
Hello list(s), Just something I noticed after setting up an x86 system after running Debian on m68k. The m68k system was an Amiga with an m68060/50MHz which gave a BogoMIP rating of 99.something. The x86 system is a dual PIII 650MHz system and it rates as 2600 BogoMIPs. This would seem to imply that on a per MHz basis, the m68060 is the equivalent of two PIIIs. -- http://www.spatial.freeserve.co.uk ...or something
Re: cpu arch performance
* Lee Elliott in cpu arch performance dated 2000/05/23 22:49 wrote:
Hello list(s),
Just something I noticed after setting up an x86 system after running
Debian on m68k.
The m68k system was an Amiga with an m68060/50MHz which gave a BogoMIP
rating of 99.something. The x86 system is a dual PIII 650MHz system and
it rates as 2600 BogoMIPs. This would seem to imply that on a per MHz
basis, the m68060 is the equivalent of two PIIIs.
From Jargon File (4.2.0, 31 JAN 2000) [jargon]:
BogoMIPS bo'go-mips The number of million times a second a
processor can do absolutely nothing. The {Linux} OS measures
BogoMIPS at startup in order to calibrate some soft timing loops
that will be used later on; details at the BogoMIPS mini-HOWTO
(http://www.hobby.nl/~clifton). The name Linus chose, of course, is
an ironic comment on the uselessness of all _other_ {MIPS} figures.
--
Ashley Clark
pgpaLaQeGfh3J.pgp
Description: PGP signature
Re: cpu arch performance
Lee Elliott [EMAIL PROTECTED] writes: it rates as 2600 BogoMIPs. This would seem to imply that on a per MHz basis, the m68060 is the equivalent of two PIIIs. http://www.linuxdoc.org/HOWTO/mini/BogoMips.html -- Hi! I'm a .signature virus! Copy me into your ~/.signature to help me spread!
