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RedruMRF
n00b
Joined: 02 Aug 2006
Posts: 9
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 Posted: Wed May 07, 2008 6:22 am Post subject: Weird /proc/mtrr |
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Hello everyone,
In fact, I got a new install on my new hardware and since I am tracking things to improve.
So, I found a possible performance issue with my nvidia-drivers, actually I have some reasons to think that my 2D acceleration is not working.
So here comes my mtrr:
| Code: | reg00: base=0xd0000000 (3328MB), size= 256MB: uncachable, count=1
reg01: base=0xe0000000 (3584MB), size= 512MB: uncachable, count=1
reg02: base=0x00000000 ( 0MB), size=4096MB: write-back, count=1
reg03: base=0x100000000 (4096MB), size= 512MB: write-back, count=1
reg04: base=0x120000000 (4608MB), size= 256MB: write-back, count=1
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I am pretty upset, if I understood well, I have
a 4GB range address (which is good since I got 4GB mem) But I don't understand what are those reg00/reg01 uncachable range address right inside reg02.
On top of that, my video card have 512Vram, but here is what I get in lspci -v:
| Code: | 01:00.0 VGA compatible controller: nVidia Corporation Unknown device 0611 (rev a2) (prog-if 00 [VGA controller])
Subsystem: CardExpert Technology Unknown device 0401
Flags: bus master, fast devsel, latency 0, IRQ 16
Memory at fd000000 (32-bit, non-prefetchable) [size=16M]
Memory at d0000000 (64-bit, prefetchable) [size=256M]
Memory at fa000000 (64-bit, non-prefetchable) [size=32M]
I/O ports at cc00 [size=128]
[virtual] Expansion ROM at fe8e0000 [disabled] [size=128K]
Capabilities: [60] Power Management version 3
Capabilities: [68] Message Signalled Interrupts: Mask- 64bit+ Queue=0/0 Enable-
Capabilities: [78] Express Endpoint, MSI 00
Kernel driver in use: nvidia
Kernel modules: nvidia
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Memory at d0000000 (64-bit, prefetchable) [size=256M] ; According to these my vram isn't well recognized, and if I look at the memory address, 0xd0000000 refers to reg00 in my /proc/mtrr.
Searching in my bios (and searching support on asus website) there is no range register switch in the bios for this mainboard.
My system is a 64 bit gentoo, mtrr support is already built in my kernell
Linux localhost 2.6.24-gentoo-r4 #20 SMP Tue May 6 23:07:34 CEST 2008 x86_64 Intel(R) Core(TM)2 Quad CPU Q6600 @ 2.40GHz GenuineIntel GNU/Linux
So from now on, I don't know how to go past these.
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energyman76b
Advocate
Joined: 26 Mar 2003
Posts: 2048
Location: Germany
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| Posted: Wed May 07, 2008 9:50 am Post subject: |
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2d is always working. The problem with 8xxx cards and later ---> 2d is very slow with this cards
In my experience, 2d starts ok, but after watching videos or flash, 2d performance goes down - and starting a fullscreen 3d app (any game) restores 2d speed too.
And my card doesn't even clock down 
Its driver bugs.
btw, you can try this: nvidia-settings -a InitialPixmapPlacement=2 -a GlyphCache=1
in several setups it speeds up text display a lot.
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RedruMRF
n00b
Joined: 02 Aug 2006
Posts: 9
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| Posted: Wed May 07, 2008 3:13 pm Post subject: |
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Hum, I ve tryed nvidia-settings -a InitialPixmapPlacement=2 -a GlyphCache=1 as you said , does not seem to help much.
But my /proc/mtrr still appears weird to me, am I wrong ?
I also must admit that I don't really understand the role of it; but I would understand.
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