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Date: Wed, 9 Apr 2008 17:04:24 +0800 From: "Zhao Forrest" <forrest.zhao@...il.com> To: "Andi Kleen" <andi@...stfloor.org> Cc: discuss@...-64.org, linux-kernel@...r.kernel.org, yhlu.kernel@...il.com, mingo@...e.hu, ak@...e.de Subject: Re: Does Linux have plan to support memory hole remapping? On 4/9/08, Andi Kleen <andi@...stfloor.org> wrote: > "Zhao Forrest" <forrest.zhao@...il.com> writes: > > > > As we can see from above information that the physical memory in system > > is 32768MB(32GB). However OS is only using about > > (32768-512)MB(MemTotal: 33010240 kB). Does this mean that this > > linux kernel can't use the physical memory remapped > > from (4G-512M, 4G) to (32G, 32G+512M)? > > The linux kernel can only use the memory passed to it by the BIOS. > Sometimes they need special BIOS setup options to enable remapping. If > there are no such options and you can't upgrade it you're out of luck Yes, I have enabled mem hole remapping in BIOS SETUP. After looking into dmesg, I found that all 32GB physical memory has been allocated to 8 nodes, but why MemTotal shows a less amount of memory than 32GB? Interesting...... Does MemTotal means the amount of physical memory allocated to all nodes? Or it has different meanings? Thanks, Forrest -- 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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