Messages in this thread | | | Date | Fri, 24 Sep 2004 14:38:27 +1000 (EST) | From | Sergei Haller <> | Subject | Re: lost memory on a 4GB amd64 |
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I just discovered the linux-smp list and decided to summarize the topic and take the opportunity to cross-post to there.
an archive of the discussion can be found e.g. here: http://marc.theaimsgroup.com/?t=109525952600004&r=1&w=4
The machine at hand is the Tyan Tiger K8W with two Opterons 246 (http://www.tyan.com/products/html/tigerk8w.html) and 4GB of memory
we are using vanilla 2.6.8.1 kernel.
* if the memory is set up in the ordinary way in the BIOS, then approximately 512MB are lost (PCI/AGM adressing and stuff), but everything is stable * if the memory is set up in the BIOS to be in two chunks (e.g. 3GB at the address range 0-3GB and 1GB at 4-5GB address range), then - memtest86 tells everything is fine. - if we run a non-SMP kernel, everything is stable - if we run an SMP kernel, it crashes as soon as approx. 1GB of memory is allocated and set to 0 (see the test case C-program in my previous mail)
Is there anything we can do? Any logs I can provide? Something to try out?
Thanks, Sergei -- -------------------------------------------------------------------- -?) eMail: Sergei.Haller@math.uni-giessen.de /\\ -------------------------------------------------------------------- _\_V Be careful of reading health books, you might die of a misprint. -- Mark Twain - 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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