Messages in this thread | | | Date | Fri, 9 Dec 2005 00:40:58 +0100 | From | Andi Kleen <> | Subject | Re: [discuss] Re: [PATCH 1/3] Zone reclaim V3: main patch |
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On Thu, Dec 08, 2005 at 03:35:05PM -0800, Christoph Lameter wrote: > On Fri, 9 Dec 2005, Andi Kleen wrote: > > > > My experience is that at 20 systems do not need zone reclaim yet. > > > > I really cannot confirm your experience here. > > Maybe the meaning of these numbers varies? I know that 10 is a local > access but the assumption in include/linux/numa.h that 20 is a remote > access is probably already a guess.
The spec seems to suggest it's roughly the NUMA factor scaled (so for 1.4 you would get 14). But I haven't actually seen a Opteron with correct SLIT yet so I don't know what they use ...
> I know that our Altix machines seem to use 10 for a local and 20 for > nonlocal but same box. The distances then increase from there.
Unless non local same box is 2 times as slow as the local I wouldn't consider that correct. (I would expect the Altix to do better than that) -Andi - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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