Problem with CPU speed report
Libei
Supermicro P4DCE+ motherboard Dual Intel XEON 2.2 MHZ CPU
When system boot it shows CPU clock 2.18GHZ.
%kernel - - - rel=3.2v5.0.6 kid=2000-07-27
%cpu - - - unit=1 family=15 type=Intel Xeon
%cpuid - - - unit=1 vend=GenuineIntel
tfms=0:15:2:4(11)
%fpu - 13 - unit=1 type=80387-compatible
%pci 0x0CF8-0x0CFF - - am=1 sc=1 buses=5
%PnP - - - nodes=0
%clock - - - type=TSC/2180769788Hz
In cpu report it only shows CPU speed 2.076GHZ.
Report about cpu for host1 on Wed Oct 23 08:50:59 2002
There are 2 CPUs on this system.
Maximum: 10
Configured: 2
Active: 2
CPU 1 performs like a 2076Mhz Intel Xeon
Processor: 1 (0xffffe)
Vendor ID: GenuineIntel
cpu_family: 15
cpu_id: 0x0b000f24
type: 0
family: 15
model: 2
stepping: 4
brandId: 11
I have another server with the same Motherboard, cpu is 1.7GHZ XEON
and cpu report shows the right speed.
Openserver 5.0.6a included the patch for P4 CPU.
Any idea?
Tom Parsons
Don't expect perfection. That speed test is an approximation. I grabbed
these for comparison. Everything on 5.0.6 or 5.0.5
200mhz Pentium The CPU performs like a 302Mhz Intel Pentium
400mhz PII The CPU performs like a 400Mhz Intel Pentium II Model 5
233mhz Pentium The CPU performs like a 354Mhz Intel Pentium
200mhz Pentium The CPU performs like a 189Mhz Intel Pentium
400mhz PII The CPU performs like a 463Mhz Intel Pentium II
120mhz Pentium The CPU performs like a 113Mhz Intel Pentium
333mhz Pentium Pro The CPU performs like a 334Mhz Intel Pentium II
600mhz PIII The CPU performs like a 621Mhz Intel Pentium II
--
==========================================================================
Tom Parsons t...@tegan.com
==========================================================================
Bill Vermillion
Tom Parsons <c...@tegan.com> wrote:
>Libei enscribed:
>| Openserver 5.0.6a
>| Supermicro P4DCE+ motherboard Dual Intel XEON 2.2 MHZ CPU
>| When system boot it shows CPU clock 2.18GHZ.
[buncha stuff deleted - wjv]
>Don't expect perfection. That speed test is an approximation. I grabbed
>these for comparison. Everything on 5.0.6 or 5.0.5
> 200mhz Pentium The CPU performs like a 302Mhz Intel Pentium
> 400mhz PII The CPU performs like a 400Mhz Intel Pentium II Model 5
> 233mhz Pentium The CPU performs like a 354Mhz Intel Pentium
> 200mhz Pentium The CPU performs like a 189Mhz Intel Pentium
> 400mhz PII The CPU performs like a 463Mhz Intel Pentium II
> 120mhz Pentium The CPU performs like a 113Mhz Intel Pentium
> 333mhz Pentium Pro The CPU performs like a 334Mhz Intel Pentium II
> 600mhz PIII The CPU performs like a 621Mhz Intel Pentium II
Some of those are more explainable than others.
For instance:
> 120mhz Pentium The CPU performs like a 113Mhz Intel Pentium
A 100Mhz Pentium typically runs the bus at 66MHz, while the 120MHz
Pentium uses the 60MHz bus, so that whil the CPU is 20% faster the
bus is 10% slower. Thankfully we don't have to play those games on
new machines.
100Mhz * 20% = 120MHz.[cpu speed difference]
120 - 10% = 112MHz - [bus speed compensation].
That means the ideal chips in that ere were 100, 133 and 166 as
they all used the 66MHz bus.
Sort of like the old horsepower wars from Detroit a long time ago -
bigger engines didn't neccesarily go faster :-)
Bill
--
Bill Vermillion - bv @ wjv . com
Stephen M. Dunn
$Libei enscribed:
$| Openserver 5.0.6a
$| Supermicro P4DCE+ motherboard Dual Intel XEON 2.2 MHZ CPU
$| When system boot it shows CPU clock 2.18GHZ.
I'm not sure how exact the speeds at which CPUs run are - if your
system actually runs it at precisely 2 200 000 000 Hz or if it might
be off slightly. 2.18 is only 1% different from 2.2.
And, if you remember your scientific notation from science class,
2.2 is not an exact number - it includes any value which, rounded
off to two significant digits, comes to 2.2. 2.18 is such a value
(as are 2.1525609825604896 and 2.2492098672460894560489
and a whole bunch of other numbers). So if Intel claims 2.2 GHz,
2.18 GHz is an acceptable value from a scientific perspective.
$| In cpu report it only shows CPU speed 2.076GHZ.
A bit farther off, but also not usually a problem in practice. This
this is a derived value - some kind of loop is run and timed*, and
the result is compared to stored values for various processors. Two
identical CPUs could return different ratings if other aspects
of system performance (memory bandwidth, cache efficiency) cause
them to perform differently.
*: actually, it's more likely that a loop is run for a fixed
time period and the number of completed loops is used; otherwise,
fast CPUs run the loop too quickly to measure, or if you make it a
big loop to compensate, slower CPUs take too long to run it.
$Don't expect perfection. That speed test is an approximation. I grabbed
$these for comparison. Everything on 5.0.6 or 5.0.5
$
$ 200mhz Pentium The CPU performs like a 189Mhz Intel Pentium
OSR5.0.5 rated my old P200 system at 189, too.
Some more examples (all with the appropriate microcode updates
applied):
5.0.5, PIII 500: Unix reports Pentium II 509 MHz
5.0.4, PII 233: Pentium II 233
5.0.4, PIII 900*: Pentium II 991
5.0.5, PIII 600*: Pentium II 607
*: I don't have the specs handy for those boxes
Libei, chances are the speedometer in your car doesn't report
accurately, either - most cars are actually going slightly slower
than their speedometers indicate. It doesn't mean there's
something wrong with your car.
--
Stephen M. Dunn <ste...@stevedunn.ca>
>>>----------------> http://www.stevedunn.ca/ <----------------<<<
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