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drm/i915: Only apply the jump to the "efficient RPS" frequency on startup

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Currently we apply the jump to rpe if we are below it and the GPU needs
more power. For some GPUs, the rpe is 75% of the maximum range causing
us to dramatically overshoot low power applications *and* unable to
reach the low frequency that can most efficiently deliver their
workload.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: http://patchwork.freedesktop.org/patch/msgid/20170210150348.22146-3-chris@chris-wilson.co.uk
Reviewed-by: Radoslaw Szwichtenberg <radoslaw.szwichtenberg@intel.com>
This commit is contained in:
Chris Wilson 2017-02-10 15:03:48 +00:00
parent 17136d548e
commit bd64818dfe
2 changed files with 9 additions and 10 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

8
drivers/gpu/drm/i915/i915_irq.c
View file

@ -1173,14 +1173,6 @@ static void gen6_pm_rps_work(struct work_struct *work)
if (new_delay >= dev_priv->rps.max_freq_softlimit)
adj = 0;
/*
* For better performance, jump directly
* to RPe if we're below it.
*/
if (new_delay < dev_priv->rps.efficient_freq - adj) {
new_delay = dev_priv->rps.efficient_freq;
adj = 0;
}
} else if (client_boost || any_waiters(dev_priv)) {
adj = 0;
} else if (pm_iir & GEN6_PM_RP_DOWN_TIMEOUT) {

11
drivers/gpu/drm/i915/intel_pm.c
View file

@ -5019,6 +5019,8 @@ void gen6_rps_busy(struct drm_i915_private *dev_priv)
{
mutex_lock(&dev_priv->rps.hw_lock);
if (dev_priv->rps.enabled) {
u8 freq;
if (dev_priv->pm_rps_events & (GEN6_PM_RP_DOWN_EI_EXPIRED | GEN6_PM_RP_UP_EI_EXPIRED))
gen6_rps_reset_ei(dev_priv);
I915_WRITE(GEN6_PMINTRMSK,
@ -5026,9 +5028,14 @@ void gen6_rps_busy(struct drm_i915_private *dev_priv)
gen6_enable_rps_interrupts(dev_priv);
/* Ensure we start at the user's desired frequency */
/* Use the user's desired frequency as a guide, but for better
* performance, jump directly to RPe as our starting frequency.
*/
freq = max(dev_priv->rps.cur_freq,
dev_priv->rps.efficient_freq);
if (intel_set_rps(dev_priv,
clamp(dev_priv->rps.cur_freq,
clamp(freq,
dev_priv->rps.min_freq_softlimit,
dev_priv->rps.max_freq_softlimit)))
DRM_DEBUG_DRIVER("Failed to set idle frequency\n");