On Sat, 26 Sep 2009 00:47:04 +0200 Brice Goglin wrote: > Francesco Poli wrote: > > Forgive my ignorance: adding what? where? > > > > Could you please elaborate? > > Should I modify some configuration file? Which one? How? > > > > /proc/mtrr lists some physical address ranges that are marked as > write-combining (WC).
On the system under consideration, I have:
$ cat /proc/mtrr
reg00: base=0x000000000 ( 0MB), size= 128MB, count=1: write-back
reg01: base=0x008000000 ( 128MB), size= 64MB, count=1: write-back
reg02: base=0x00c000000 ( 192MB), size= 32MB, count=1: write-back
reg03: base=0x00e000000 ( 224MB), size= 16MB, count=1: write-back
reg04: base=0x090000000 ( 2304MB), size= 128MB, count=2: write-combining
reg07: base=0x0a0000000 ( 2560MB), size= 64MB, count=2: write-combining
$ free -b
total used free shared buffers cached
Mem: 244797440 233570304 11227136 0 11702272 110903296
-/+ buffers/cache: 110964736 133832704
Swap: 271392768 0 271392768
I don't know if these data may help you in shedding some light on my
problem...
> It's possible to add new ranges writing in
> /proc/mtrr manually.
Ah, I see: I was not aware of this possibility.
I'm sorry, but I am not a kernel/X11 expert... :-(
> If you don't know anything about all this, you should not try since
> doing something wrong may freeze the machine.
If by "freeze" you mean that my box could experience a lockup, and I
would have to power-cycle it in order to get everything back up and
running, without permanent damage, then I could even try to perform a
few tests (under your guide)...
If by "freeze" you mean that I could damage the hardware or lose data
from my filesystems, then I am afraid I must refrain from performing
any such test: this is a production machine, not a test one, and I do
not have any ready-to-go replacement laptop (yet).
--
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..................................................... Francesco Poli .
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