Re: Opteron box and 4Gb memory
- From: lsorense@xxxxxxxxxxxxxxxxxxx (Lennart Sorensen)
- Date: Mon, 5 Nov 2007 13:50:40 -0500
On Mon, Nov 05, 2007 at 07:45:21PM +0100, J.A. Magall?n wrote:
Well, problem solved...
I'm going to kill all pc assemblers in the world... Someone should teach them
to learn mauals before assembling anything but a power chord.
The memory was not paired, so the motherboard was not interleaving the access.
With no inter-node but with inter-module interleaving, and a couple 1Gb sticks
for each processor now I get something like:
cicely:~/bn> bn
name: cicely.cps.unizar.es
arch: x86-64
proc: 4 x x86_64 @ 2200 MHz
ram: 3555 Mb
os: unx, Linux, 2.6.23.1-desktop-1mdv
cc: gcc-4.3.0
vector size : 8 x 1024 x 1024
allocation: 0.02 ms
int scl add: .......... 60.56 ms, 138.52 Mips | 62.96 Mips /GHz
int scl mul: .......... 59.34 ms, 141.36 Mips | 64.26 Mips /GHz
flt scl add: .......... 59.01 ms, 142.16 Mflops | 64.62 Mflops/GHz
flt vec add: .......... 14.79 ms, 567.06 Mflops | 257.75 Mflops/GHz
flt scl mul: .......... 59.02 ms, 142.12 Mflops | 64.60 Mflops/GHz
flt vec mul: .......... 14.82 ms, 566.19 Mflops | 257.36 Mflops/GHz
total: 5019.86 ms
Much better, but not like the other opteron box.
My processors are higher than Rev E0, because the BIOS does not let me choose
the 'software' hole. If I activate the 'hardware hole', I see al the memory
I can:
cicely:~/bn> free
total used free shared buffers cached
Mem: 3640628 214496 3426132 0 21240 84184
-/+ buffers/cache: 109072 3531556
Swap: 4200988 0 4200988
3.64 Gb. The rest is eaten by the graphics card, as I could read in the
AMD site. Don't know if mem=4096 to boot the kernel would help, even if it
is possible (don't think so, as it looks like a BIOS mis-feature).
The ram is DDR 400.
The video card is stealing 300MB of ram? What for? What does the mtrr
and e820 map look like with the hardware hole enabled?
Anyways, can I trust what dmidecode says ? I installed the ram as the board
manual said in banks 1A+1B (not 2A+2B) for each processor, but this program
says this:
BANK0 64Mb BANK4 64Mb
BANK1 64Mb BANK5 64Mb
BANK2 1024Mb BANK6 1024Mb
BANK3 1024Mb BANK7 1024Mb
I would always have thought that BANK0 would be slot 1A in first processor,
but it looks like not...
And where do the 64 Mb blocks come from ?
Well if you ahve 4 sticks of 1GB, then I would hope they are installed
as a pair for each CPU so that both CPUs can have dual channel ram
directly connected.
I have no idea where the 64Mb comes from.
--
Len Sorensen
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