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Old 04-21-2008, 05:10 PM   #1
earlysame55
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confused


dear gurus,

How do i differenciate between the linux machine architectures for RHEL 4 update 4. I mean how can i get to know whether a machine is categoried as i686/X86_64/AMD64?. When identified should i use a different CD/DVD to install it?
 
Old 04-21-2008, 05:33 PM   #2
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Quote:
Originally Posted by earlysame55 View Post
dear gurus,

How do i differenciate between the linux machine architectures for RHEL 4 update 4. I mean how can i get to know whether a machine is categoried as i686/X86_64/AMD64?.
By the CPU in use? ANY machine in the Intel-compatible category
should happily run i686. An opteron potentially won't run X86_64,
and a recent CoreDuo won't run AMD64.


Quote:
Originally Posted by earlysame55 View Post
When identified should i use a different CD/DVD to install it?
Depends on what the use case is. Generally 64-bit CPUs
have more registers (makes apps faster) and a wider bus
to memory (faster access to RAM, very good for RDBMS).

On the other hand it may be slightly wasteful on memory
usage, too, since the smallest memory chunk (or at least
that's my understanding of it) is now 4 Byte.



Cheers,
Tink
 
Old 04-21-2008, 11:23 PM   #3
earlysame55
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Tink,

Thanks for the reply. Is there a place where i can see/get a metrix how each processor should behave or show me architecture. My Dual core BL685c G1 shows the following in it's Rilo2:
Proc 1: 2200 MHz
Execution technology: 2/2 cores; 2 threads
Memory technology: 64-bit capable
Processor 1 Internal L1 Cache: 64 KB
Processor 1 Internal L2 Cache: 1024 KB

(i have shown only one isntance of the procerrors there are 4 like that )

but my /proc/cpuinfo says:

processor : 7
vendor_id : AuthenticAMD
cpu family : 15
model : 65
model name : Dual-Core AMD Opteron(tm) Processor 8214
stepping : 3
cpu MHz : 1004.703
cache size : 1024 KB
physical id : 3
siblings : 2
core id : 1
cpu cores : 2
fpu : yes
fpu_exception : yes
cpuid level : 1
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext lm 3dnowext 3dnow pni cx16
bogomips : 2009.29
TLB size : 1088 4K pages
clflush size : 64
cache_alignment : 64
address sizes : 40 bits physical, 48 bits virtual
power management: ts fid vid ttp [4] [5]

and the uname -a is :
Linux linuxbl51.mediasolv.com 2.6.9-42.ELsmp #1 SMP Wed Jul 12 23:32:02 EDT 2006 x86_64 x86_64 x86_64 GNU/Linux

uname -mp
x86_64 x86_64.

Do you see a problem here. Pls let me know where to find a matrix regarding the uname -m.

Thanks and regards.
 
Old 04-21-2008, 11:41 PM   #4
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I don't see a problem (the opterons are apparently quite happy to run
generic x86_64); you may be missing out on some features that are only
enabled in the MAD64 build, but I can't say that for sure, either.

I'm not greatly involved with hardware these days.


Cheers,
Tink
 
Old 04-22-2008, 12:37 AM   #5
earlysame55
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Tink, but looking at the clock speeds the OS reports and in comparison to what the Rilo reports there is a clock speed mismatch. What do U think of that.
 
  


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