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This instructs SLPC to ramp the GT frequency aggressively. > > SVM relies on an internal exec queue to migrate memory upon page faults. > This change creates this exec queue with the low latency hint to speed up > migration. > > This should not impact systems where GT frequency is set over sysfs, or > with long running workloads which give enough time for the frequency to > ramp up. An example of memory access pattern that shows an improvement of > SVM performance is running hundreds of times IGT eu-fault-2m-once-device > in xe_exec_system_allocator. The copy duration provided by GT stats in > svm_2M_device_copy_us shows per GPU page fault: > ~ 165 μs without low latency hint > ~ 130 μs with low latency hint > > Suggested-by: Matthew Brost > Cc: Rodrigo Vivi > Reviewed-by: Rodrigo Vivi > Signed-off-by: Francois Dugast pushed to drm-xe-next. > --- > drivers/gpu/drm/xe/xe_migrate.c | 3 ++- > 1 file changed, 2 insertions(+), 1 deletion(-) > > diff --git a/drivers/gpu/drm/xe/xe_migrate.c b/drivers/gpu/drm/xe/xe_migrate.c > index 3de8ce2516e2..00eef41a9e36 100644 > --- a/drivers/gpu/drm/xe/xe_migrate.c > +++ b/drivers/gpu/drm/xe/xe_migrate.c > @@ -472,7 +472,8 @@ int xe_migrate_init(struct xe_migrate *m) > EXEC_QUEUE_FLAG_KERNEL | > EXEC_QUEUE_FLAG_PERMANENT | > EXEC_QUEUE_FLAG_HIGH_PRIORITY | > - EXEC_QUEUE_FLAG_MIGRATE, 0); > + EXEC_QUEUE_FLAG_MIGRATE | > + EXEC_QUEUE_FLAG_LOW_LATENCY, 0); > } else { > m->q = xe_exec_queue_create_class(xe, primary_gt, vm, > XE_ENGINE_CLASS_COPY, > -- > 2.43.0 >