Dotan Cohen wrote:
On 30/01/07, Philip Walden <pwaldenlinux@xxxxxxxxxxx> wrote:
Philip Walden wrote:
> Dotan Cohen wrote:
>> On a recent Dell laptop, what would cause DVD playback to be very
>> choppy?
> Besides the ATA DMA stuff, you may also want to check whether your
> MTRR is being set properly by the xorg X server.
>
> Mine looks like this:
>
> cat /proc/mtrr
> reg00: base=0x00100000 ( 1MB), size= 256MB: write-back, count=1
> reg01: base=0xfc000000 (4032MB), size= 32MB: write-combining, count=1
>
> You should have at least one "write-combining" entry which means the
> graphics card is set properly. Otherwise, performance can drop
> dramatically.
Here is a howto:
http://www.faqs.org/docs/Linux-HOWTO/DVD-HOWTO.html#ss6.1
Thanks. I've nothing in /proc/mtrr:
[root@localhost ~]# ls /proc/mtrr
/proc/mtrr
Try:
cat /proc/mtrr
reg00: base=0x00100000 ( 1MB), size= 256MB: write-back, count=1
reg01: base=0xfc000000 (4032MB), size= 32MB: write-combining, count=1
However, I'm having a hard time starting X, as it's already running!
I've combed the logs in /var/logs but I don't have those lines. When I
kill X with CTRL-ALT-ESC it starts right back up automatically, not
letting me redirect it's output to a file.
I found mine using lspci
# /sbin/lspci -v
:
01:05.0 VGA compatible controller: nVidia Corporation NV5 [RIVA
TNT2/TNT2 Pro] (rev 15) (prog-if 00 [VGA])
Subsystem: ASUSTeK Computer Inc. AGP-V3800 SDRAM
Flags: bus master, 66MHz, medium devsel, latency 40, IRQ 11
Memory at f5000000 (32-bit, non-prefetchable) [size=16M]
Memory at fc000000 (32-bit, prefetchable) [size=32M]
<========== use the prefetchable
Capabilities: [60] Power Management version 1
Capabilities: [44] AGP version 2.0
I then added this to /etc/rc.local:
# set mtrr at least until Xorg 7.1 is added to the distribution
echo "base=0xfc000000 size=0x2000000 type=write-combining" >| /proc/mtrr
Just for kicks, here's the output of "lspci -v" as suggested by the
same page:
:
01:00.0 VGA compatible controller: ATI Technologies Inc Radeon
Mobility X1400 (prog-if 00 [VGA])
Subsystem: Dell Unknown device 2003
Flags: bus master, fast devsel, latency 0, IRQ 4
Memory at d0000000 (32-bit, prefetchable) [size=256M]
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
I/O ports at ee00 [size=256]
Memory at efdf0000 (32-bit, non-prefetchable) [size=64K]
[virtual] Expansion ROM at efd00000 [disabled] [size=128K]
Capabilities: [50] Power Management version 2
Capabilities: [58] Express Legacy Endpoint IRQ 0
Capabilities: [80] Message Signalled Interrupts: 64bit+
Queue=0/0 Enable-
I would guess your's would look like:
echo "base=0xd0000000 size=0x10000000 type=write-combining" >| /proc/mtrr
