Messages in this thread | | | From | Roland Dreier <> | Subject | Re: memory beyond4GB invisible to the system even though CONFIG_HIGHMEM64G=y | Date | Wed, 14 Jan 2009 08:14:35 -0800 |
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> please do > 1. boot linux with "disable_mtrr_trim" in grub.conf etc > 2. after booting input: > echo "base=0x100000000 size=0x20000000 type=write-back" >/proc/mtrr
Is there any way we can have the kernel do this automatically if there are any free mtrr slots? I would guess this type of BIOS bug is pretty common (desktop boards not validated with > 4GB of RAM), and having the kernel throw away 4GB of memory unless the user does some fancy scripting is not very friendly (not to mention the fact that things are likely to be very slow until the mtrr fixup script runs).
- R.
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