[Mesa-dev] r600g: status of my work on the shader optimization

[Vadim Girlin]

On 02/14/2013 08:53 PM, Stefan Seifert wrote:
> Hi!
>
> Amazing work! I see some 50 % speed ups in FlightGear and even more. While
> normally 3D clouds tear performance down to an unflyable stutter, with your
> branch I can fly in densly clouded conditions at usable framerates. I can now
> turn all shaders to maximum and enjoy the view. This makes a huge difference.
>
> Unfortunately there's a downside as well:
>
> [ 4644.872676] radeon 0000:01:00.0: GPU lockup CP stall for more than
> 10000msec
> [ 4644.872681] radeon 0000:01:00.0: GPU lockup (waiting for 0x00000000000a0c1d
> last fence id 0x00000000000a0c16)
> [ 4644.873727] radeon 0000:01:00.0: Saved 215 dwords of commands on ring 0.
> [ 4644.873730] radeon 0000:01:00.0: GPU softreset: 0x00000003
> [ 4644.880943] radeon 0000:01:00.0:   GRBM_STATUS               = 0xF4002828
> [ 4644.880946] radeon 0000:01:00.0:   GRBM_STATUS_SE0           = 0xC0000005
> [ 4644.880948] radeon 0000:01:00.0:   GRBM_STATUS_SE1           = 0x00000007
> [ 4644.880950] radeon 0000:01:00.0:   SRBM_STATUS               = 0x200000C0
> [ 4644.880952] radeon 0000:01:00.0:   R_008674_CP_STALLED_STAT1 = 0x00000000
> [ 4644.880955] radeon 0000:01:00.0:   R_008678_CP_STALLED_STAT2 = 0x40040000
> [ 4644.880957] radeon 0000:01:00.0:   R_00867C_CP_BUSY_STAT     = 0x00048002
> [ 4644.880959] radeon 0000:01:00.0:   R_008680_CP_STAT          = 0x80268643
> [ 4644.880961] radeon 0000:01:00.0:   GRBM_SOFT_RESET=0x00007F6B
> [ 4644.881014] radeon 0000:01:00.0:   GRBM_STATUS               = 0x00003828
> [ 4644.881016] radeon 0000:01:00.0:   GRBM_STATUS_SE0           = 0x00000007
> [ 4644.881019] radeon 0000:01:00.0:   GRBM_STATUS_SE1           = 0x00000007
> [ 4644.881021] radeon 0000:01:00.0:   SRBM_STATUS               = 0x200000C0
> [ 4644.881023] radeon 0000:01:00.0:   R_008674_CP_STALLED_STAT1 = 0x00000000
> [ 4644.881025] radeon 0000:01:00.0:   R_008678_CP_STALLED_STAT2 = 0x00000000
> [ 4644.881027] radeon 0000:01:00.0:   R_00867C_CP_BUSY_STAT     = 0x00000000
> [ 4644.881030] radeon 0000:01:00.0:   R_008680_CP_STAT          = 0x00000000
> [ 4644.898500] radeon 0000:01:00.0: GPU reset succeeded, trying to resume
>
> R600_SB=0 is stable while with R600_SB=1 I can somewhat reliably reproduce
> these lockups. Is there someting I can do to debug this? Or are problems like
> this already expected?
>

I pushed the fix for one problem that I noticed with FlightGear to that 
branch, please test if it helps with your lockups as well.

If that fix doesn't help, you might want to test with the debug build of 
mesa (configure with "--enable-debug" option) if you haven't tried it 
yet - many issues then may be detected by the asserts in the code.

Vadim

> In any case please keep up this work! Even though it might eventually be
> replaced by some llvm backend, this could make your users very happy in the
> mean time.
>
> Regards,
> Stefan
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