Different cpuspeednw on two different hosts with same cpu config. Why?

Question

Hi,
there are two hosts.
They are different, but have same CPU configuration (I guess it from the output below).
Host1: Solaris 10, 4 cpu, 4 core in each cpu.
psrinfo -v
Status of virtual processor 0 as of: 03/04/2010 08:57:45
on-line since 12/25/2009 11:03:23.
The i386 processor operates at 2133 MHz,
and has an i387 compatible floating point processor.
Status of virtual processor 15 as of: 03/04/2010 08:57:45
on-line since 12/25/2009 11:03:25.
The i386 processor operates at 2133 MHz,
and has an i387 compatible floating point processor.
Host2: CentOS 5.3. Also 4 cpu, 4 cores in each spu
cat /proc/cpuinfo
processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 15
model name : Intel(R) Xeon(R) CPU E7320 @ 2.13GHz
stepping : 11
cpu MHz : 2133.413[b]
cache size : 2048 KB
physical id : 0
siblings : 4
core id : 0
cpu cores : 4
apicid : 0
fpu : yes
fpu_exception : yes
cpuid level : 10
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca c
mov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm syscall lm constan
t_tsc pni monitor ds_cpl vmx est tm2 cx16 xtpr lahf_lm
bogomips : 4270.09
clflush size : 64
cache_alignment : 64
address sizes : 40 bits physical, 48 bits virtual
processor : 15
vendor_id : GenuineIntel
cpu family : 6
model : 15
model name : Intel(R) Xeon(R) CPU E7320 @ 2.13GHz
stepping : 11
cpu MHz : [b]2133.413
cache size : 2048 KB
physical id : 6
siblings : 4
core id : 3
cpu cores : 4
apicid : 27
fpu : yes
fpu_exception : yes
cpuid level : 10
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm syscall lm constant_tsc pni monitor ds_cpl vmx est tm2 cx16 xtpr lahf_lm
bogomips : 4266.82
clflush size : 64
cache_alignment : 64
address sizes : 40 bits physical, 48 bits virtual
QUESTION:
Host1 (Solaris) has cpuspeednw = 700
Host2 (CentOS) has cpuspeednw = 1700
WHY?
What should I do to find out why this is happening?
Edited by: user10944480 on Mar 14, 2010 7:22 AM
Edited by: user10944480 on Mar 14, 2010 7:24 AM

Answer 1

user10944480 wrote:
QUESTION:
Host1 (Solaris) has cpuspeednw = 700
Host2 (CentOS) has cpuspeednw = 1700
WHY?
What should I do to find out why this is happening?
The CPUSPEEDNW is measured in "millions of Oracle operations per second" - but we don't know what "operation" Oracle is using for measuring. Since you have two difference operating systems, it's possible that the "operation" that Oracle uses is one that makes use of the "OSD" (operating system dependant) code and has a very different code path on the two machines that results in a very different speed of completion.
Regards
Jonathan Lewis
http://jonathanlewis.wordpress.com
http://www.jlcomp.demon.co.uk
To post code, statspack/AWR report, execution plans or trace files, start and end the section with the tag {noformat}{noformat} (lowercase, curly brackets, no spaces) so that the text appears in fixed format.
There is a +"Preview"+ tab at the top of the text entry panel. Use this to check what your message will look like before you post the message. If it looks a complete mess you're unlikely to get a response. (Click on the +"Plain text"+ tab if you want to edit the text to tidy it up.)
+"Science is more than a body of knowledge; it is a way of thinking"+
+Carl Sagan+