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Date: Fri, 3 Apr 2009 13:49:27 -0700 From: Yinghai Lu <yhlu.kernel@...il.com> To: Brice Goglin <Brice.Goglin@...ia.fr> Cc: Chris Worley <worleys@...il.com>, linux-kernel@...r.kernel.org Subject: Re: Off topic: Numactl "distance" wrong On Fri, Apr 3, 2009 at 1:16 PM, Brice Goglin <Brice.Goglin@...ia.fr> wrote: > Chris Worley wrote: >> Sorry for an off topic, but I'm hoping somebody can point me in the >> right direction of where to direct this question... >> >> I have an Opteron system where I've seen the HW diagrams, and each of >> 4 sockets is directly connected (HT) to two other sockets, and two HT >> hops away from a third (i.e. a simple square topology, no X in the >> middle). >> >> Yet, "numactl --hardware" shows but one hop to each socket: >> >> # numactl --hardware >> ... >> node 0 1 2 3 >> 0: 10 20 20 20 >> 1: 20 10 20 20 >> 2: 20 20 10 20 >> 3: 20 20 20 10 >> >> I know this is wrong. >> >> Who would be the right person (or list) to talk about this? >> > > IIRC, the motherboard/BIOS is supposed to report numa distances through > the PXM ACPI method. But I have never seen any opteron box do it > properly. So you just get 10 for "local" and 20 for "remote". Some > Itanium machines however report actual distances. for x86 64 bit, we are copying SLIT table and save another copy. could provide one /sys interface to make user could modify it... YH -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.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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