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st/mesa: add environment variable pin_app_thread for faster glthread on AMD Zen

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Acked-by: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@amd.com>
Tested-by: Marge Bot <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4369>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4369>
This commit is contained in:
Marek Olšák 2020-03-27 08:20:51 -04:00
parent 4df3c7a207
commit 6e672074dd
1 changed files with 10 additions and 0 deletions
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10
src/gallium/auxiliary/util/u_helpers.c
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@ -192,6 +192,16 @@ util_pin_driver_threads_to_random_L3(struct pipe_context *ctx,
/* Do the same for the upper level thread if there is any (e.g. glthread) */
if (upper_thread)
util_pin_thread_to_L3(*upper_thread, cache, util_cpu_caps.cores_per_L3);
/* Optionally pin the application thread to the same L3 to get maximum
* performance with glthread on AMD Zen. (this function is only called
* with glthread) This is used to estimate and remove the overhead of
* Infinity Fabric between L3 caches.
*/
#if defined(HAVE_PTHREAD)
if (debug_get_bool_option("pin_app_thread", false))
util_pin_thread_to_L3(pthread_self(), cache, util_cpu_caps.cores_per_L3);
#endif
}
/* This is a helper for hardware bring-up. Don't remove. */