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тАО11-23-2007 01:31 AM
тАО11-23-2007 01:31 AM
PAE / Highmen
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тАО11-23-2007 01:52 AM
тАО11-23-2007 01:52 AM
Re: PAE / Highmen
I think that in these versions, you need to install the kernel-bigmem package or something similar. Check the kernel* packages available.
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тАО11-23-2007 01:59 AM
тАО11-23-2007 01:59 AM
Re: PAE / Highmen
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тАО11-23-2007 04:54 AM
тАО11-23-2007 04:54 AM
Re: PAE / Highmen
Check "cat /proc/cpuinfo", do you see pae as one of the flags?
There is a parameter in kernel called CONFIG_HIGHMEM. How much recommended it is, I am not sure. Since you do not want to mess around, I would not suggest this.
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тАО11-25-2007 08:00 PM
тАО11-25-2007 08:00 PM
Re: PAE / Highmen
Then look in the /boot directory: most Linux distributions, including RedHat, create a file like /boot/config-
The configuration file contains only ASCII text, so you can view it. Look for settings like CONFIG_HIGHMEM. CONFIG_HIGHMEM64G certainly enables PAE support: other CONFIG_HIGHMEM options (CONFIG_NOHIGHMEM or CONFIG_HIGHMEM4G) change the memory arrangement within the 4GiB limit of the 32-bit architecture.
To find the meaning of the various options, it's usually easiest to get the kernel source package and read the option description in the kernel configurator's Help menus.
See also:
http://www.spack.org/wiki/LinuxRamLimits
The memory difference might also be caused by some PCI add-on cards: if a card has some I/O memory that must be accessible to the applications (e.g. some sort of transfer buffers in case of a SCSI/RAID card or a video digitizer), this I/O memory will overlap some of the real memory within 4 GiB limit.
MK
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тАО11-25-2007 11:49 PM
тАО11-25-2007 11:49 PM
Re: PAE / Highmen
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тАО11-25-2007 11:50 PM
тАО11-25-2007 11:50 PM
Re: PAE / Highmen
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тАО11-26-2007 05:13 AM
тАО11-26-2007 05:13 AM
Re: PAE / Highmen
The /proc/cpuinfo simply indicates that the processor is PAE capable if pae is present in the flags, nothing more.
What you actually need is a kernel with PAE support, that's all. If kernel doesn't support PAE, your system will not see more than 4 GB RAM.
Since you also plan to upgrade the RAM to 8 GB, I would recommend that you either try compiling the kernel or upgrade the version of RHEL to a version that has a PAE enabled kernel by default.
Compiling should be easy, just make sure you have a separate kernel for this purpose. The parameters can be tweaked. You need to start either "make config" or "make menuconfig". This link has more description & some screenshots.
http://en.linuxreviews.org/Kernel_Rebuild_Guide#The_Configuration_Process
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тАО11-26-2007 05:14 AM
тАО11-26-2007 05:14 AM
Re: PAE / Highmen
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тАО11-26-2007 05:40 AM
тАО11-26-2007 05:40 AM
Re: PAE / Highmen
I do not think 2.1 has a "hugemem" kernel, I think hugemem kernels are only for RHEL 3 and 4 and are only required for systems with more than 16GB of memory.
Not surprisingly, "2.4.9-e.3smp" is the SMP kernel. The enterprise kernel has "enterprise" instead of "smp" in the version string. Off the top of my head I don't remember what the official supported memory limit is on 2.1 ES, you might want to check with your RH support to make sure you don't go out of compliance (it's a contract thing, not a technology thing).
By the way, that's a very old kernel, I think the current release for 2.1 is 2.4.9-e.72. Since you have to boot a different kernel anyway to increase the memory you may want to consider an update.