On Sat, 2006-10-28 at 02:32 -0400, Alan Altmark wrote: > On Friday, 10/27/2006 at 04:12 ZE2, Martin Schwidefsky > <[EMAIL PROTECTED]> wrote: > > After the BogoMips number has entertained us once again I'm inclined to > > "fix" this stupid number. > > Yipee!
:-) > > For replacement we could use the cpu capability that is reported by the > > store system information instruction in SYSIB 1.2.2. On our test system > > it reports a cpu capability of 1456 (System z type 2094 model 738/S38). > > The bogomips number is between ~3400 and ~4000 dependent on the phase of > > the moon and the my caffeine-level. With the attached patch the same > > number is report every time. Makes sense, doesn't it ? > > Is it possible to call it the "BogoFactor" instead of BogoMIPS? Esp. > since there is no formal definition of the CPU Capability? At least the bogomips entry in the /proc/cpuinfo interface is fixed, we cannot just change it. I would leave it as it is. > It seems that you should apply the "adjustment factors" and select the > Primary, Secondary, or Alternate CPU capability as appropriate. Also, to > quote the book, "a lower value indicates a proportionally higher CPU > capacity. Beyond that, there is no formal description of the algorithm > used to generate this value." Hmmm... "lower value" ... hmmm.... From > that I infer that it is related to cycle time in some undefined way, but > that a value of 0 would represent an infinitely "capable" CPU. (I know, > I'm making big leaps in my assumptions.) Arg, the cpu capacity gets lower for faster machines! Now I finally have understood why they introduced a floating point number in the interface. Lower value, that makes the number useless for bogomips. I'd have to invent some calculation like 1000000 / cpu capacity. > BTW, I *love* the "42" answer on a Really Old Machine! But that would indicate a really fast machine! I can't use 42 as the answer for old machines.. too bad ;-) -- blue skies, Martin. Martin Schwidefsky Linux for zSeries Development & Services IBM Deutschland Entwicklung GmbH "Reality continues to ruin my life." - Calvin. ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390
