Date:	Fri, 14 Aug 2009 15:48:03 +0200
From:	Knut Petersen <Knut_Petersen@...nline.de>
To:	Peter Zijlstra <peterz@...radead.org>
CC:	airlied@...ux.ie, linux-kernel@...r.kernel.org
Subject: Re: drm / i915 performance problems

Peter Zijlstra schrieb:
> I bet some people'd love to know what X.org version and intel drv
> version you're using.
>
> Also, if you're having KMS enabled or not.
>
>   
Well, I doubt that Xorg is the problem as it perfectly works with older
versions of the kernel.

The problem is always present, no matter if
- KMS is enabled or not
- the agp/drm drivers are compiled as a module or compiled into the kernel
- vesafb is used or not
- tile blitting is enabled in framebuffer config space or not

BTW: kernel 2.6.30.4 performs as bad as 2.6.31-rc6.

>From boot.log:
<6>Linux agpgart interface v0.103
<6>agpgart-intel 0000:00:00.0: Intel 915GM Chipset
<6>agpgart-intel 0000:00:00.0: detected 7932K stolen memory
<6>agpgart-intel 0000:00:00.0: AGP aperture is 256M @ 0xc0000000
<6>[drm] Initialized drm 1.1.0 20060810
<6>i915 0000:00:02.0: PCI INT A -> GSI 16 (level, low) -> IRQ 16
<7>i915 0000:00:02.0: setting latency timer to 64
<6>[drm] DAC-6: set mode 640x480 0
<6>[drm] TV-12: set mode NTSC 480i 0
<3>render error detected, EIR: 0x00000010
<3>page table error
<3>  PGTBL_ER: 0x00000010
<3>[drm:i915_handle_error] *ERROR* EIR stuck: 0x00000010, masking
<3>render error detected, EIR: 0x00000010
<3>page table error
<3>  PGTBL_ER: 0x00000010
<6>[drm] TMDS-8: set mode 1024x768 1a
<4>Console: switching to colour frame buffer device 128x48
<6>[drm] fb0: inteldrmfb frame buffer device
<6>[drm] Initialized i915 1.6.0 20080730 for 0000:00:02.0 on minor 0


>From the Xorg log:

X.Org X Server 1.5.2
Release Date: 10 October 2008
X Protocol Version 11, Revision 0
Build Operating System: openSUSE SUSE LINUX
Current Operating System: Linux linux-golem 2.6.31-rc6-kape
[...]
(II) Loading /usr/lib/xorg/modules//drivers/intel_drv.so
(II) Module intel: vendor="X.Org Foundation"
        compiled for 1.5.2, module version = 2.5.0
        Module class: X.Org Video Driver
        ABI class: X.Org Video Driver, version 4.1
[...](II) [drm] DRM interface version 1.3
(II) [drm] DRM open master succeeded.
(II) intel(0): [drm] Using the DRM lock SAREA also for drawables.
(II) intel(0): [drm] framebuffer mapped by ddx driver
(II) intel(0): [drm] added 1 reserved context for kernel
(II) intel(0): X context handle = 0x1
(II) intel(0): [drm] installed DRM signal handler
(**) intel(0): Framebuffer compression enabled
(**) intel(0): Tiling enabled
(==) intel(0): VideoRam: 262144 KB
(II) intel(0): Attempting memory allocation with tiled buffers.
(EE) intel(0): Failed to set tiling on front buffer: Invalid argument
(EE) intel(0): Failed to set tiling on back buffer: Invalid argument
(EE) intel(0): Failed to set tiling on depth buffer: Invalid argument
(II) intel(0): Tiled allocation successful.
(II) intel(0): [drm] Registers = 0xd2300000
(II) intel(0): [drm] Initialized kernel agp heap manager, 33554432
(II) intel(0): [dri] visual configs initialized
(II) intel(0): Page Flipping disabled
(II) intel(0): vgaHWGetIOBase: hwp->IOBase is 0x03d0, hwp->PIOOffset is
0x000
[...]
(II) intel(0): Fixed memory allocation layout:
(II) intel(0): 0x00000000-0x005fffff: compressed frame buffer (6144 kB,
0x000000007f800000 physical)
(II) intel(0): 0x00600000-0x00600fff: compressed ll buffer (4 kB,
0x000000007fe00000 physical)
(II) intel(0): 0x00601000-0x0060afff: HW cursors (40 kB,
0x000000007fe01000 physical)
(II) intel(0): 0x0060b000-0x0060bfff: overlay registers (4 kB,
0x000000007fe0b000 physical)
(II) intel(0): 0x007bf000:            end of stolen memory
(II) intel(0): 0x007bf000-0x0bdd3fff: DRI memory manager (186452 kB)
(II) intel(0): 0x0bdd4000-0x0d9f3fff: exa offscreen (28800 kB)
(II) intel(0): 0x0d9f4000-0x0f9f3fff: classic textures (32768 kB)
(II) intel(0): 0x10000000:            end of aperture
(II) intel(0): BO memory allocation layout:
(II) intel(0): 0x007bf000:            start of memory manager
(II) intel(0): 0x007bf000-0x0111efff: depth buffer (9600 kB)
(II) intel(0): 0x017bf000-0x0211efff: back buffer (9600 kB)
(II) intel(0): 0x02800000-0x037fffff: front buffer (16384 kB)
(II) intel(0): 0x027bf000-0x027c6fff: logical 3D context (32 kB)
(II) intel(0): 0x0bdd4000:            end of memory manager
(WW) intel(0): ESR is 0x00000010, page table error
(WW) intel(0): PGTBL_ER is 0x00000010, display A pte
(WW) intel(0): PRB0_CTL (0x0001f001) indicates ring buffer enabled
(WW) intel(0): Existing errors found in hardware state.
(II) intel(0): Selecting standard 18 bit TMDS pixel format.
(II) intel(0): Output configuration:
(II) intel(0):   Pipe A is on
(II) intel(0):   Display plane A is now enabled and connected to pipe A.
(II) intel(0):   Pipe B is on
(II) intel(0):   Display plane B is now enabled and connected to pipe B.
(II) intel(0):   Output VGA is connected to pipe none
(II) intel(0):   Output LVDS is connected to pipe B
(II) intel(0):   Output TMDS-1 is connected to pipe A
(II) intel(0):   Output TV-2 is connected to pipe none
(II) intel(0):   Output TV is connected to pipe none
(II) intel(0): [drm] mapped front buffer at 0xc2800000, handle = 0xc2800000
(II) intel(0): [drm] mapped back buffer at 0xc17bf000, handle = 0xc17bf000
(II) intel(0): [drm] mapped depth buffer at 0xc07bf000, handle = 0xc07bf000
(II) intel(0): [drm] mapped classic textures at 0xcd9f4000, handle =
0xcd9f4000

cu,
 Knut

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