 | | | RHEL 3 | RHEL 3 2007-05-07 - By Paul Krizak
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We're currently using RHEL3 U8 on mostly dual-core, dual-socket (but
also lots of dual-core, quad- and octo-socket) Opteron systems with no
problems at all using the SMP kernel.
So at least for AMD architectures, I can confirm that multicore support
is there. What isn't is ccNUMA suport. Even in RHEL4 it isn't really
there. The kernel "supports" it, but but multi-core chips, the RHEL3
kernel falls apart when trying to determine what memory is mapped to
which CPU. RHEL4 is marginally better, but frankly NUMA support should
be simply disabled until RHEL5, where it has actually been implemented
properly.
Use "numa=off" on the kernel command line, and in the BIOS of your
systems set Node Interleaving to "on" or "auto", and turn off the ACPI
SRAT table. This will set your system up as a "normal" SMP system,
which RHEL3 can get very good performance from.
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
Majumder, Rajib wrote:
> Hi,
>
> I am wondering if RHEL 3 (based on 2.4.21 kernel but RH claims they
> backported lot of 2.6 kernel's feature into it) supports Multi-Core and
> Hyperthreaded CPUs.
>
> I am specifically looking to clarify the following on RHEL 3 (containing
> the RH-engineered 2.4.21 kernel):
>
> 1) Is the CPU-scheduler multi-core/hyperthreading aware?
> 2) Is it aware ccNUMA multi-core CPU?
>
> Any input is appreciated.
>
> Thanks
>
> Rajib
>
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