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drm/sched: Switch default policy to fair

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FAIR policy works better than FIFO for all known use cases and either
matches or gets close to RR. Lets make it a default to improve the user
experience especially with interactive workloads competing with heavy
clients.

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@igalia.com>
Cc: Christian König <christian.koenig@amd.com>
Cc: Danilo Krummrich <dakr@kernel.org>
Cc: Matthew Brost <matthew.brost@intel.com>
Cc: Philipp Stanner <phasta@kernel.org>
Cc: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@amd.com>
Acked-by: Danilo Krummrich <dakr@kernel.org>
Tested-by: Vitaly Prosyak <vitaly.prosyak@amd.com>
Signed-off-by: Philipp Stanner <phasta@kernel.org>
Link: https://patch.msgid.link/20260417103744.76020-13-tvrtko.ursulin@igalia.com
This commit is contained in:
Tvrtko Ursulin 2026-04-17 11:37:27 +01:00 committed by Philipp Stanner
parent af85fa14ad
commit 45c211ddf9
1 changed files with 2 additions and 2 deletions
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4
drivers/gpu/drm/scheduler/sched_main.c
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@ -84,13 +84,13 @@
#define CREATE_TRACE_POINTS
#include "gpu_scheduler_trace.h"
int drm_sched_policy = DRM_SCHED_POLICY_FIFO;
int drm_sched_policy = DRM_SCHED_POLICY_FAIR;
/**
* DOC: sched_policy (int)
* Used to override default entities scheduling policy in a run queue.
*/
MODULE_PARM_DESC(sched_policy, "Specify the scheduling policy for entities on a run-queue, " __stringify(DRM_SCHED_POLICY_RR) " = Round Robin, " __stringify(DRM_SCHED_POLICY_FIFO) " = FIFO (default), " __stringify(DRM_SCHED_POLICY_FAIR) " = Fair.");
MODULE_PARM_DESC(sched_policy, "Specify the scheduling policy for entities on a run-queue, " __stringify(DRM_SCHED_POLICY_RR) " = Round Robin, " __stringify(DRM_SCHED_POLICY_FIFO) " = FIFO, " __stringify(DRM_SCHED_POLICY_FAIR) " = Fair (default).");
module_param_named(sched_policy, drm_sched_policy, int, 0444);
static u32 drm_sched_available_credits(struct drm_gpu_scheduler *sched)