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Old 12-06-2008, 07:20 AM   #1
epoh
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Kernel upgrade - SMP/Hugemem question


I've got a server only running the single cpu kernel. I am going to be upgrading it today to the multi-processor kernel (going from 2.6.9-5.EL to kernel-smp-2.6.9-78.0.8.EL.) My question is, the user is planning on maxing out the RAM in this box in the near future (32gigs) which means I will need the hugemem kernel, correct? The only thing I see on RHN is the hugemem-devel package. I had thought there was a kernel-hugememsmp available. How do I install hugemem using just the devel rpm?
 
Old 12-07-2008, 01:35 AM   #2
paulsm4
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Hi -

The "hugemem kernel" is for 32-bit CPUs/32-bit OS's.

If you've got a 64-bit CPU, then you don't need it/don't want it:

http://www.linuxquestions.org/questi...-x8664-438262/

If you *don't* have a 64-bit CPU ... then why not?

'Hope that helps .. PSM
 
Old 12-07-2008, 03:28 PM   #3
anomie
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http://kbase.redhat.com/faq/docs/DOC-3977
 
Old 12-07-2008, 11:45 PM   #4
paulsm4
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anomie - the Redhat link doesn't give any idea about what the "hugemem" kernel is ... or why it might be a bad idea.

I was originally going to object that we didn't even know if the op had Redhat ... until I noticed the cryptic reference to "RHN" (Red Hat Network, rhn.redhat.com).

But again - if you *can* go to a 64-bit CPU, then you *should* go to 64-bit.

Otherwise, if you're required to stick with 32-bits (for any number of perfectly good reasons), you should consider "hugemem" *only* as a last resort. It adds an extra level of indirection to your memory addressing, and an extra level of complexity to the OS.

IMHO .. PSM

Last edited by paulsm4; 12-07-2008 at 11:50 PM.
 
Old 12-08-2008, 12:35 AM   #5
anomie
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@paulsm4: IMO, the KB article speaks pretty closely to OP's situation. (Except that we don't know which arch / RHEL version he has.) If the info is not useful, he is welcome to ignore it.

@epoh: If you're still unable to locate the kernel you need, you might double check your channels and/or contact RH support.
 
Old 12-08-2008, 12:48 AM   #6
syg00
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I don't think RH even offer the hugemem on EL5 - probably for all the reasons above.
If you are on EL4 (considering how old that kernel is) you should probably be able to get it.
 
Old 12-08-2008, 07:47 AM   #7
epoh
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Thank you guys. This server is running the x64 smp kernel now. RHEL4, btw. The upgrade to the latest smp went flawlessly.
 
  


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