[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?

Hi,

Thanks for testing that branch. I haven't tested it with FlightGear yet. 
I'll see if I can reproduce the problem on my system. If I won't be able 
to reproduce it, then I'll need your help to debug it.

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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