Messages in this thread |  | | | Date | Fri, 3 Oct 2008 01:20:36 +0200 | | From | "J.A. Magallón" <> | | Subject | Re: [PATCH 2/2] x86: mtrr_cleanup try gran_size to less than 1M |
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On Thu, 2 Oct 2008 15:39:34 -0700, "Yinghai Lu" <yinghai@kernel.org> wrote:
> On Thu, Oct 2, 2008 at 3:32 PM, J.A. Magallón <jamagallon@ono.com> wrote: > > On Mon, 29 Sep 2008 18:54:12 -0700, Yinghai Lu <yhlu.kernel@gmail.com> wrote: > > > > Also, on a 64 bit box with 4Gb, it gives this: > > > > cicely:~# cat /proc/mtrr > > reg00: base=0x00000000 ( 0MB), size=4096MB: write-back, count=1 > > reg01: base=0x100000000 (4096MB), size=1024MB: write-back, count=1 > > reg02: base=0x140000000 (5120MB), size= 512MB: write-back, count=1 > > reg03: base=0x160000000 (5632MB), size= 256MB: write-back, count=1 > > reg04: base=0x80000000 (2048MB), size=2048MB: uncachable, count=1 > > > boundary handling may have problem... > > should have > > reg00: base=0x00000000 ( 0MB), size=2048MB: write-back, count=1
should not this ^^^^^ be 4096MB ?? > > reg01: base=0x100000000 (4096MB), size=1024MB: write-back, count=1 > > reg02: base=0x140000000 (5120MB), size= 512MB: write-back, count=1 > > reg03: base=0x160000000 (5632MB), size= 256MB: write-back, count=1 > > can you post /proc/mtrr with disable_mtrr_cleanup? >
Oops, sorry, this is without cleanup. This is a distro kernel and is built but not enable by deafult. As it is rc7, I will use 'enble_mtrr_cleanup' ;):
cicely:~# cat /proc/mtrr reg00: base=0x00000000 ( 0MB), size=2048MB: write-back, count=1 reg01: base=0x100000000 (4096MB), size=1024MB: write-back, count=1 reg02: base=0x140000000 (5120MB), size= 512MB: write-back, count=1 reg03: base=0x160000000 (5632MB), size= 256MB: write-back, count=1 I have lost 2Gb ?
cicely:~# free total used free shared buffers cached Mem: 3755568 182348 3573220 0 14024 72716 -/+ buffers/cache: 95608 3659960
I can't easily try your patch, this is a distro kernel. I will get the src.rpm...
Ahhhhh.... This is a dual opteron board. dmidecode says:
Handle 0x0026, DMI type 16, 15 bytes Physical Memory Array Location: System Board Or Motherboard Use: System Memory Error Correction Type: Single-bit ECC Maximum Capacity: 8 GB Error Information Handle: Not Provided Number Of Devices: 8
So it maps one Opteron memory in first 4Gb and the other on the second 4Gb. So I should have 2Gb@0 and 2Gb@4Gb. What I don't know is why the bios eats up 256Mb.
-- J.A. Magallon <jamagallon()ono!com> \ Software is like sex: \ It's better when it's free Mandriva Linux release 2009.0 (Cooker) for i586 Linux 2.6.25-jam18 (gcc 4.3.1 20080626 (GCC) #1 SMP -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.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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