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Date: Fri, 26 Oct 2007 10:08:08 +0200 From: Arne Georg Gleditsch <argggh@...phinics.no> To: J.A. Magallón <jamagallon@....com> Cc: linux-kernel@...r.kernel.org Subject: Re: Opteron box and 4Gb memory "J.A. Magallón" <jamagallon@....com> writes: > Software Memory Hole > When "Enabled", allows software memory remapping around the memory > hole. Options are Enabled and Disabled. > > Hardware Memory Hole > When "Enabled", allows software memory remapping around the memory > hole. Options are Enabled and Disabled. Note: this is only supported by > Rev E0 processors and above. > ( I have two Opteron 275 processors, no idea about revision) The configuration register used to to reclaim DRAM lost to an MMIO hole was introduced with revision E of the gen1 Opterons. (This feature is supposed to work both in interleaved and non-interleaved mode.) What does /proc/cpuinfo say? (On both?) (Still, even without this your BIOS should be able to map your memory so that you are able to use all 4G. Provided you disable interleaving, I can't see that there's anything stopping the BIOS from mapping the memory from node 1 to 0-2G and the memory from node 2 to 4-6G, leaving a 2G hole for MMIO and other junk. Whether your BIOS actually supports this is another matter.) -- Arne. - 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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