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January 2010

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Subject:
Memory limits for Scientific Linux kernels
From:
Tim Edwards <[log in to unmask]>
Reply To:
Tim Edwards <[log in to unmask]>
Date:
Thu, 28 Jan 2010 14:56:31 +0100
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We're trying to work out memory limits for 32-bit versions of SL4 and 5.
Redhat's page (http://www.redhat.com/rhel/compare/) says that the
maximums are 64GB or RHEL4 and 16GB for RHEL5 (I guess because they
dropped the HUGEMEM kernel RPM in RHEL5).

This page (http://www.scientificlinux.org/documentation/misc/limits)
says that it's 64GB in SL4 but gives no information for SL5. So two
questions:

Does SL4 i386 have a 'HUGEMEM' kernel build or do you just build those
features into the normal -smp kernel build in order to support 64GB RAM?

What is the memory limit on SL5 i386?

Thanks

Tim Edwards

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