[Bug 99312] Long-running OpenCL kernels cause ring stalls and GPU lockups on Kabini when radeon.lockup_timeout is enabled

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=99312

Vedran Miletić <vedran at miletic.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|Long-running OpenCL kernels |Long-running OpenCL kernels
                   |cause ring stalls and GPU   |cause ring stalls and GPU
                   |lockups on Kabini           |lockups on Kabini when
                   |                            |radeon.lockup_timeout is
                   |                            |enabled

--- Comment #2 from Vedran Miletić <vedran at miletic.net> ---
(In reply to John Bridgman from comment #1)
> If you have not already done so, try disabling the watchdog timer:
> 
> 
> MODULE_PARM_DESC(lockup_timeout, "GPU lockup timeout in ms (default 10000 =
> 10 seconds, 0 = disable)");
> module_param_named(lockup_timeout, radeon_lockup_timeout, int, 0444);
> 

Yup, that works around the problem.

> As part of HSA/ROC development we dropped the priority of compute work
> relative to graphics which improved interactivity and *almost* eliminated
> timeouts without having to disable the timer  - when I get back in the
> office I'll dig up the changes. In the meantime, I think disabling the timer
> will do what you need although you will still have sluggish graphics while
> long-running kernels are active.
> 

Eager to hear the details.

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