Re: BogoMIPs rating too high?
Hello Gene,
On 06-Apr-00, you wrote:
GH>
GH>
GH>
GH> On 6 Apr 2000, Lee Elliott wrote:
GH>> Date: 6 Apr 2000 19:44:52 -0000
GH>> To: debian-68k@lists.debian.org
GH>> From: Lee Elliott <LeeE@spatial.freeserve.co.uk>
GH>> Subject: BogoMIPs rating too high?
GH>>
GH>> Hello List,
GH>>
GH>> I've noticed, from postings to this and the Debian-user lists, that
GH>> the
GH>> Bogo(us)MIPs rating I get from my 68060/50 seem unreasonably high
GH>> at
GH>> 99.something. Other figures I've seen are 21.24 for a 68040/33 and
GH>> 399.something for a PPC-G3/400. I'm assuming that the BogoMIP
GH>> rating
GH>> is used for timings of some sort and was wondering what the effects
GH>> might be if the figure I'm getting is inaccurate. Any thoughts
GH>> anyone?
GH>
GH> I don't know how much diff there is between that cpu running ados,
GH> and that cpu running at the linux boot phase, but there is a program
GH> called Mips for the 060's, and it is normally quite close to 80 mips
GH> by that utility.
GH>
GH> Don't forget that in addition to running twice as fast as an 040
GH> normally runs, which would give a 40ish rating, the 060 also has
GH> dual execution units, again doubling its speed to the 80 area.
GH>
GH> Getting 99 sounds like maybe that board has been overclocked, or the
GH> bogomips test really isn't that comparable. Overclocking to around
GH> 63 mhz would get about that speed.
The board isn't overclocked - I think it's most probably inaccurate. I
was only wondering as I can get very strange (and amusing) behaviour
from gnome-panel when starting a gnome session: I have two panels set
to start on login and when the system has just been booted, a task
appears to start in the background (locate update?) and they'll usually
get about half way through loading the applets when they give up and
start up another pair, and so on, and so on... As I'm only running
Debian on my Ami to get some experience before I get a x86 SMP system
together for my 3d app, this isn't a problem, but it's just about the
only time I ever see my system using swap space ;-) (64MB RAM) and once
I've killed everything off, reset the gnome settings and restart the
panels again, after the background process has finished, it behaves
very well. I was thinking that if the BogoMIP rating was inaccurate
(too high) then things might be timing out before they should be. The
kernel however, seems to remain quite unperturbed and stable through
all this (and other bad behaviour I throw at it) but I would expect
timing problems there too.
Bye,
LeeE
--
http://www.spatial.freeserve.co.uk
...or something.
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