Andras Simon wrote:
On 2/5/07, Philip Walden <pwaldenlinux@xxxxxxxxxxx> wrote:
Andras Simon wrote:
>
> Hmm. I'm using Xorg's nv driver, not the Nvidia binary driver, and my
> Nvidia card is pretty old, so this may be totally irrelevant, but
> anyway:
The driver should not matter. The MTRR gives the driver efficient access
to the AGP card.
OK
>
> $ cat /proc/mtrr
> reg00: base=0x00000000 ( 0MB), size= 512MB: write-back, count=1
> reg01: base=0xe0000000 (3584MB), size= 64MB: write-combining, count=1
This *looks* like a decent MTRR setting although it would appear
incorrect for the lspci listing below
reg01: base=0xd8000000 (?????MB), size= 128MB: write-combining, count=1
>
> $ /sbin/lspci -v
> ...
> VGA compatible controller: nVidia Corporation NV11 [GeForce2 MX/MX
400]
> (rev b2) (prog-if 00 [VGA])
> Flags: bus master, 66MHz, medium devsel, latency 64, IRQ 11
> Memory at e4000000 (32-bit, non-prefetchable) [size=16M]
> Memory at d8000000 (32-bit, prefetchable) [size=128M]
>
> Unless I misunderstood your explanation, this means that the mtrr
> settings are not correct. Still, Xorg's cpu utilization is 0.3% (all
> this on a PIII, FC5, with regularly updated Xorg server).
So, based on the above, and your description, I guess I should
echo "base=0xd8000000 size=0x8000000 type=write-combining" >| /proc/mtrr
That looks correct.
However, I am wondering where the other reg01 mttr is coming from:
reg01: base=0xe0000000 (3584MB), size= 64MB: write-combining, count=1
If Xorg is using only 0.3% cpu when doing intensive graphics/video (ie
mplayer, xine) then I think your MTRR is just fine.
Well, no, not when under stress. It can easily go up to 50% when
mplayer is running.
The OP wrote
| I have top running in a terminal window and there are two processes
| running, Xorg and top. Xorg is using 18% of the cpu.
so I assumed this thread was about Xorg cpu utilization when X is idle.
