Messages in this thread | | | Date | Mon, 19 Nov 2007 18:02:11 -0800 (PST) | From | Christoph Lameter <> | Subject | Re: [rfc 08/45] cpu alloc: x86 support |
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On Mon, 19 Nov 2007, H. Peter Anvin wrote:
> You're making the assumption here that NUMA = large number of CPUs. This > assumption is flat-out wrong.
Well maybe. Usually one gets to NUMA because the hardware gets too big to be handleed the UMA way.
> On x86-64, most two-socket systems are still NUMA, and I would expect that > most distro kernels probably compile in NUMA. However, > burning megabytes of memory on a two-socket dual-core system when we're > talking about tens of kilobytes used would be more than a wee bit insane.
Yeah yea but the latencies are minimal making the NUMA logic too expensive for most loads ... If you put a NUMA kernel onto those then performance drops (I think someone measures 15-30%?)
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