[Beowulf] Performance issue - CPU Intel 00/02

Bill Wichser bill at princeton.edu
Wed Jul 20 11:11:05 EDT 2005


bogomips shows the same numbers.  Interesting find though on the x86info 
testing.  Can it be that this has been bad all along?  I'll need to pull 
  some CPUs to see if they are indeed Celeron, which I seriously doubt.

BAD
Found 1 CPU
--------------------------------------------------------------------------
Family: 15 Model: 2 Stepping: 4 Type: 0 Brand: 15
CPU Model: Celeron (P4 core) [B0] Original OEM
Feature flags:
  fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat 
pse36 clflsh dtes acpi mmx fxsr sse sse2 selfsnoop ht acc
Extended feature flags:

Instruction trace cache:
         Size: 12K uOps  8-way associative.
L1 Data cache:
         Size: 8KB       Sectored, 4-way associative.
         line size=64 bytes.
L2 unified cache:
         Size: 512KB     Sectored, 8-way associative.
         line size=64 bytes.
Instruction TLB: 4K, 2MB or 4MB pages, fully associative, 64 entries.
Data TLB: 4KB or 4MB pages, fully associative, 64 entries.
The physical package supports 1 logical processors


GOOD
Found 1 CPU
--------------------------------------------------------------------------
Family: 15 Model: 2 Stepping: 4 Type: 0 Brand: 9
CPU Model: Pentium 4 (Northwood) [B0] Original OEM
Processor name string: Intel(R) Pentium(R) 4 CPU 2.40GHz

Feature flags:
  fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat 
pse36 clflsh dtes acpi mmx fxsr sse sse2 selfsnoop ht acc
Extended feature flags:

Instruction trace cache:
         Size: 12K uOps  8-way associative.
L1 Data cache:
         Size: 8KB       Sectored, 4-way associative.
         line size=64 bytes.
L2 unified cache:
         Size: 512KB     Sectored, 8-way associative.
         line size=64 bytes.
Instruction TLB: 4K, 2MB or 4MB pages, fully associative, 64 entries.
Data TLB: 4KB or 4MB pages, fully associative, 64 entries.
The physical package supports 1 logical processors


John Hearns wrote:
> On Wed, 2005-07-20 at 09:48 -0400, Bill Wichser wrote:
> 
> 
>>By accident I discovered that of these 128 nodes, 50 of them show some 
>>strange value in /proc/cpuinfo for model name.  On a good node these 
>>reveal themselves as "Intel(R) Pentium(R) 4 CPU 2.40GHz" while on a 
>>"bad" node they call themselves "00/02" yet when checking the BIOS, and 
>>all the nodes have the same configuration I believe although I neglected 
>>to gather the level this last go round, they reveal themselves correctly 
>>as Intel(R) Pentium(R) 4 CPU 2.40GHz.
>>
> 
> Jumping in with both feet,
> could you try running Dave Jones' x86info on good/bad nodes?
> http://www.codemonkey.org.uk/projects/x86info/
> Also does the bogomips rating differ (that's a real stupid question, I
> know)
> 
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