Messages in this thread Patch in this message | | | Date | Wed, 14 May 2008 23:11:11 -0700 (PDT) | Subject | Re: [BUG] 2.6.26-rc1 lost half the RAM on UltraSPARC 5 | From | David Miller <> |
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From: Mikael Pettersson <mikpe@it.uu.se> Date: Tue, 13 May 2008 21:31:19 +0200
Ok, Mikael, I think I figured out this bug:
> Found ramdisk at physical address 0x10800000, size 3683665 > lmb_dump_all: > memory.cnt = 0x4 > memory.size = 0xff40000 > memory.region[0x0].base = 0x0 > .size = 0x8000000 > memory.region[0x1].base = 0x10000000 > .size = 0x7efe000 > memory.region[0x2].base = 0x17f00000 > .size = 0x3a000 > memory.region[0x3].base = 0x17f3e000 > .size = 0x8000 > reserved.cnt = 0x2 > reserved.size = 0x0 > reserved.region[0x0].base = 0x10000000 > .size = 0x35bf60 > reserved.region[0x1].base = 0x10800000 > .size = 0x10b83551
From the very beginning your higher RAM is gone. It's correct that some memory should be reserved, for the ramdisk, but not 128MB :-)
The ramdisk is just under 4MB in size, so something is fishy here.
And indeed, I'm reserving the wrong length. Please try this patch:
sparc64: Fix lmb_reserve() args in find_ramdisk().
This fixes the missing ram regression reported by Mikael Pettersson <mikpe@it.uu.se>, much thanks for all of this help in diagnosing this.
The second argument to lmb_reserve() is a size, not an end address bounds.
Signed-off-by: David S. Miller <davem@davemloft.net> --- arch/sparc64/mm/init.c | 2 +- 1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/arch/sparc64/mm/init.c b/arch/sparc64/mm/init.c index a9828d7..3c7b947 100644 --- a/arch/sparc64/mm/init.c +++ b/arch/sparc64/mm/init.c @@ -768,7 +768,7 @@ static void __init find_ramdisk(unsigned long phys_base) initrd_start = ramdisk_image; initrd_end = ramdisk_image + sparc_ramdisk_size; - lmb_reserve(initrd_start, initrd_end); + lmb_reserve(initrd_start, sparc_ramdisk_size); initrd_start += PAGE_OFFSET; initrd_end += PAGE_OFFSET; -- 1.5.5.1.57.g5909c
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