[Bug 99312] Long-running OpenCL kernels cause ring stalls and GPU lockups on Kabini

[bugzilla-daemon@freedesktop.org]

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

--- Comment #1 from John Bridgman <john.bridgman@amd.com> ---
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);

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.

Lowering the priority of compute waves across the board won't be a fully
general solution because there are going to be some cases (eg Valve's recent
work with using high priority compute to improve VR smoothness) where compute
will need to be *higher* priority than graphics but it should cover most cases
other than "simultaneously running GROMACS and VR".

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