RHEL3 U4 2007-08-01 - By Paul Krizak
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The "improved" refers to better NUMA support. Before U6, if you ran on
a dualcore system in NUMA mode, and tried to grow a process beyond the
size of a single node, it would begin swapping, i.e. the process
couldn't grow across nodes. The U6 kernel fixed this problem.
However, for RHEL3 we have *always* found that running in SMP mode (node
interleaving ON, ACPI SRAT table OFF in the BIOS, and "numa=off" on
kernel cmd line) yields a significant performance improvement. When
running in this mode, the NUMA support is irrelevant. So I would say
that you're *probably* OK with U4 on a dual-core box, so long as you
disable NUMA.
Paul Krizak 5900 E. Ben White Blvd. MS 625
Advanced Micro Devices Austin, TX 78741
Linux/Unix Systems Engineering Phone: (512) 602-8775
Silicon Design Division Cell: (512) 791-0686
Brian Long wrote:
> On Wed, 2007-08-01 at 12:11 +0800, Majumder, Rajib wrote:
>> Hi,
>>
>> I am wondering if RHEL3 Update 4 supports dual-core AMD Opteron CPUs.
>> My build is Update 4.
>>
>> 1) In which Update of RHEL3, dua-core CPU support was introduced?
>
> I believe this is a question best answered by your TAM (if you have
> one). If you read the release notes for the various updates[1], you'll
> see that Update 6 introduced "improved" dual-core support. They don't
> mention what improved means, but if you search through the changelog of
> the kernel RPM, there are significant improvements with regards to the
> scheduler.
>
> /Brian/
>
> 1. https://www.redhat.com/docs/manuals/enterprise/RHEL-3 (See http://HEL-3.ora-code.com)-Manual/
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