Xorg Uses at least 18% of the cpu

[Andras Simon]

On 2/5/07, Philip Walden <pwaldenlinux at pacbell.net> 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

> 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.

Andras

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