Messages in this thread | | | From | Andrew Walrond <> | Subject | Re: lost memory on a 4GB amd64 | Date | Fri, 24 Sep 2004 10:41:08 +0100 |
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On Friday 24 Sep 2004 10:27, Rafael J. Wysocki wrote: > > > AW> cpu1's bank. How are yours arranged? > > > > my board has only four banks, each of them has a 1GB module sitting. > > (page 26 of ftp://ftp.tyan.com/manuals/m_s2875_102.pdf) > > Which is what makes the difference, I think. IMO, the problem is that > _both_ CPUs use the same memory bank that is physically attached to only > one of them which leads to conflicts, apparently (the CPU with memory has > also PCI/AGP/whatever attached to it via HyperTransport so I can imagine > there may be issues with overlapping address spaces etc.). I'd bet that > there's something wrong either with the BIOS or with the board design > itself and I don't think there's anything that the kernel can do about it > (usual disclaimer applies). > > Out of couriosity: have you tried to run the kernel with K8 NUMA enabled? >
Actually, the block diagram on page 9 of the manual suggests that this is _not_ a NUMA board, since all DIMMS are connected to cpu1. The block diagram for my thunder k8w specifically shows DIMMS associated with individual processors.
Which suggests that NUMA show be _disabled_ in the kernel config.
Have you tried it with NUMA disabled? I think I remeber it being on in the .config you sent me.
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