From 819ec5acf7593bfb84063d1b3890e80b30e1c6fa Mon Sep 17 00:00:00 2001 From: Felix Kuehling Date: Thu, 20 Jun 2019 15:37:37 -0400 Subject: drm/amdkfd: Print a warning when the runlist becomes oversubscribed Oversubscription of queues or processes results in poor performance mostly because HWS blinbly schedules busy and idle queues, resulting in poor occupancy if many queues are idle. Let users know with a warning message when transitioning from a non-oversubscribed to an oversubscribed runlist. Signed-off-by: Felix Kuehling Reviewed-by: Oak Zeng Signed-off-by: Alex Deucher --- drivers/gpu/drm/amd/amdkfd/kfd_packet_manager.c | 6 +++++- drivers/gpu/drm/amd/amdkfd/kfd_priv.h | 1 + 2 files changed, 6 insertions(+), 1 deletion(-) (limited to 'drivers/gpu/drm/amd') diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_packet_manager.c b/drivers/gpu/drm/amd/amdkfd/kfd_packet_manager.c index c72c8f5fd54c..ccf6b2310316 100644 --- a/drivers/gpu/drm/amd/amdkfd/kfd_packet_manager.c +++ b/drivers/gpu/drm/amd/amdkfd/kfd_packet_manager.c @@ -203,11 +203,15 @@ static int pm_create_runlist_ib(struct packet_manager *pm, pr_debug("Finished map process and queues to runlist\n"); - if (is_over_subscription) + if (is_over_subscription) { + if (!pm->is_over_subscription) + pr_warn("Runlist is getting oversubscribed. Expect reduced ROCm performance.\n"); retval = pm->pmf->runlist(pm, &rl_buffer[rl_wptr], *rl_gpu_addr, alloc_size_bytes / sizeof(uint32_t), true); + } + pm->is_over_subscription = is_over_subscription; for (i = 0; i < alloc_size_bytes / sizeof(uint32_t); i++) pr_debug("0x%2X ", rl_buffer[i]); diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_priv.h b/drivers/gpu/drm/amd/amdkfd/kfd_priv.h index f88c0d706b1d..08a0feb9d0a0 100644 --- a/drivers/gpu/drm/amd/amdkfd/kfd_priv.h +++ b/drivers/gpu/drm/amd/amdkfd/kfd_priv.h @@ -937,6 +937,7 @@ struct packet_manager { bool allocated; struct kfd_mem_obj *ib_buffer_obj; unsigned int ib_size_bytes; + bool is_over_subscription; const struct packet_manager_funcs *pmf; }; -- cgit v1.2.3