Terry Snyder wrote:
On 2/2/07, Philip Walden <pwaldenlinux@xxxxxxxxxxx> wrote:
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
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I noticed that you seemed to have a really good answer to this thread,
but I didn't want to but in to disrupt it. I am having the same issue
with my laptop. Here is my video card info for lspci-v:
01:00.0 VGA compatible controller: nVidia Corporation GeForce Go 7400
(rev a1) (prog-if 00 [VGA])
Subsystem: Dell Unknown device 01cc
Flags: bus master, fast devsel, latency 0, IRQ 16
Memory at ed000000 (32-bit, non-prefetchable) [size=16M]
Memory at d0000000 (64-bit, prefetchable) [size=256M]
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
prefetchable memory start address at 0xd0000000 with the size of
0x10000000 (== 256M in hex)
Memory at ee000000 (64-bit, non-prefetchable) [size=16M]
[virtual] Expansion ROM at ef000000 [disabled] [size=128K]
Capabilities: <access denied>
How do you calculate or figure out the information you gave in your
echo line. If you know please let me know.
echo "base=<address> size=<memory size> type=write-combining" >| /proc/mtrr
in this case
echo "base=0xd0000000 size=0x10000000 type=write-combining" >| /proc/mtrr
Thanks in advance for any help you can provide.
You're welcome
