Messages in this thread | | | Date | Tue, 13 Jan 2009 22:10:18 -0500 | From | "James Kirin" <> | Subject | Re: memory beyond4GB invisible to the system even though CONFIG_HIGHMEM64G=y |
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Thank you for your reply, Roland. Unfortunately, this continues happening after having installed the most recent version of the BIOS available from Dell.
I understand this is a problem in the BIOS and not the kernel, but is there a way to have the kernel work around this bug in the BIOS and make that memory accessible? Eg,
http://www.gossamer-threads.com/lists/linux/kernel/991748#991748
The difference seems to be that the BIOS on this machine I am using does list 8GB memory available.
Thanks for any help,
James
On Tue, Jan 13, 2009 at 9:22 PM, Roland Dreier <rdreier@cisco.com> wrote: > > I am running kernel 2.6.28 on a computer with 8GB RAM. The BIOS > > detects all 8GB, yet > > > > jk@as12:~$ free > > total used free shared buffers cached > > Mem: 3622504 799696 2822808 0 90936 369604 > > -/+ buffers/cache: 339156 3283348 > > Swap: 6867776 0 6867776 > > The message in your kernel log: > > [ 0.000000] WARNING: BIOS bug: CPU MTRRs don't cover all of memory, losing 4096MB of RAM. > [ 0.000000] ------------[ cut here ]------------ > [ 0.000000] WARNING: at arch/x86/kernel/cpu/mtrr/main.c:1662 mtrr_trim_uncached_memory+0x283/0x2a4() > > is a clue. You might want to look for a BIOS update for your > motherboard. > > - R. >
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