Ok, I made some progress on this:
I was able to get the same performance of X on the 945G with 1.x intel
driver (620GX) and the 965Q with 2.0 intel driver (745) with the
following setup of the MTRR registers:
echo "base=0x0 size=0x80000000 type=write-back" >| /proc/mtrr
echo "base=0x80000000 size=0x10000000 type=write-combining" >| /proc/
mtrr
(Originally I didn't have the second line)
These post were very helpful (don't know why I didn't find them
earlier):
http://forums.gentoo.org/viewtopic-t-563647-highlight-.html
http://forums.gentoo.org/viewtopic-t-501708-highlight-optiplex.html
Now the only thing that remains (I guess) is to find a proper setup of
the MTRR registers on the 755. While playing with that I was a bit
unluck... I was only able to make the box freeze so far.
On 14.01.2008, at 10:01, Dirk Gassen wrote:
Thanks for your quick reply. Unfortunately, the email
got stuck in a spam filter that's why I reply so late.
--- Donnie Berkholz <[EMAIL PROTECTED]> wrote:
On 18:45 Fri 11 Jan , Dirk Gassen wrote:
I currently have a performance problem on a
Optiplex 745/755 and the
onboard graphics card. We would like to run tvtime
as a TV application.
Unfortunately, when tvtime starts X consumes >30%
CPU, which results in a
somewhat sluggish system (responses to user
actions are slow, closed
captioning looses characters, etc.).
This system did already work well on an Optiplex
620GX (X CPU usage <15%).
Here's some more info about the systems:
To simplify things, I'm just going to point out what
I think are the
important facts.
Optiplex 620GX (works):
[SNIP]
945G with the 1.x intel driver
Optiplex 745 (performance issues):
[SNIP]
965Q with 2.0 intel driver
Optiplex 755 (also performance issues):
[SNIP]
Q35 with 2.0 intel driver
You've tested the new hardware with the old driver,
and it didn't work
for unrelated reasons
I'm not sure if the reasons were unrelated but with
the old driver I get two bars with noise, one at the
right side of the screen and one at the bottom (looked
somewhat like uninitialized memory?). I wasn't able to
get rid of by changing tvtime configuration options,
so I thought the best way would be to upgrade the
driver to 2.0, which fixed *that* problem.
Could you test the old
hardware with the new
driver, to test whether it's the driver version
change creating a
slowdown?
Nope, doesn't seem to be related to the driver change.
30% X CPU usage with 1.7.4.
Also, could you try 2.2 instead of 2.0? If
that doesn't work,
try 2.1.
Same thing (I was already looking pretty often if
there's a new driver version and jumped on each new
version)
It's also possible that the driver's just not as
good on 965 and Q35 as
on 945.
Would that be a hardware restriction or would that be
fixable in the driver (and what would I need to
do/contribute to fix it?)
I suspect there's something wrong with the MTRR
setup on the 745/755 (wild
guess):
localhost ~ # cat /proc/mtrr
reg00: base=0x00000000 ( 0MB), size=65536MB:
write-back, count=1
reg01: base=0x3d600000 ( 982MB), size= 2MB:
uncachable, count=1
reg02: base=0x3d800000 ( 984MB), size= 8MB:
uncachable, count=1
reg03: base=0x3e000000 ( 992MB), size= 32MB:
uncachable, count=1
reg04: base=0x3d500000 ( 981MB), size= 1MB:
uncachable, count=1
reg05: base=0x40000000 (1024MB), size=1024MB:
uncachable, count=1
reg06: base=0x80000000 (2048MB), size=2048MB:
uncachable, count=1
... and X reports in its log:
(WW) intel(0): Failed to set up write-combining
range
(0xd0000000,0x10000000)
Yeah, this could cause problems with speed. If it
worked in the old
versions with otherwise identical software
configurations (e.g. kernel
features), this could be a driver bug.
How would I go about setting it up manually? Or does
that need to be fixed in the driver?
Do you think I should contact the driver developers or
file a bug report for the driver?
BTW, to rule out any other interference from other
pieces of software (e.g., OpenBox) I did start only X
and tvtime, still the same problem.
Thanks,
Donnie
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