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rc80211-pid: pf_target tuning
Set a better value for percentage target for failed frames. The previous value slowed down too much rate increases in case of permanently low activity. While at it, increase readability. Signed-off-by: Stefano Brivio <stefano.brivio@polimi.it> Signed-off-by: John W. Linville <linville@tuxdriver.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -11,41 +11,41 @@
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#define RC80211_PID_H
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#define RC80211_PID_H
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/* Sampling period for measuring percentage of failed frames. */
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/* Sampling period for measuring percentage of failed frames. */
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#define RC_PID_INTERVAL (HZ / 8)
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#define RC_PID_INTERVAL (HZ / 8)
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/* Exponential averaging smoothness (used for I part of PID controller) */
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/* Exponential averaging smoothness (used for I part of PID controller) */
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#define RC_PID_SMOOTHING_SHIFT 3
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#define RC_PID_SMOOTHING_SHIFT 3
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#define RC_PID_SMOOTHING (1 << RC_PID_SMOOTHING_SHIFT)
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#define RC_PID_SMOOTHING (1 << RC_PID_SMOOTHING_SHIFT)
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/* Sharpening factor (used for D part of PID controller) */
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/* Sharpening factor (used for D part of PID controller) */
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#define RC_PID_SHARPENING_FACTOR 0
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#define RC_PID_SHARPENING_FACTOR 0
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#define RC_PID_SHARPENING_DURATION 0
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#define RC_PID_SHARPENING_DURATION 0
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/* Fixed point arithmetic shifting amount. */
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/* Fixed point arithmetic shifting amount. */
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#define RC_PID_ARITH_SHIFT 8
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#define RC_PID_ARITH_SHIFT 8
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/* Fixed point arithmetic factor. */
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/* Fixed point arithmetic factor. */
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#define RC_PID_ARITH_FACTOR (1 << RC_PID_ARITH_SHIFT)
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#define RC_PID_ARITH_FACTOR (1 << RC_PID_ARITH_SHIFT)
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/* Proportional PID component coefficient. */
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/* Proportional PID component coefficient. */
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#define RC_PID_COEFF_P 15
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#define RC_PID_COEFF_P 15
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/* Integral PID component coefficient. */
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/* Integral PID component coefficient. */
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#define RC_PID_COEFF_I 9
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#define RC_PID_COEFF_I 9
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/* Derivative PID component coefficient. */
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/* Derivative PID component coefficient. */
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#define RC_PID_COEFF_D 15
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#define RC_PID_COEFF_D 15
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/* Target failed frames rate for the PID controller. NB: This effectively gives
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/* Target failed frames rate for the PID controller. NB: This effectively gives
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* maximum failed frames percentage we're willing to accept. If the wireless
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* maximum failed frames percentage we're willing to accept. If the wireless
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* link quality is good, the controller will fail to adjust failed frames
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* link quality is good, the controller will fail to adjust failed frames
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* percentage to the target. This is intentional.
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* percentage to the target. This is intentional.
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*/
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*/
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#define RC_PID_TARGET_PF 11
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#define RC_PID_TARGET_PF 14
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/* Rate behaviour normalization quantity over time. */
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/* Rate behaviour normalization quantity over time. */
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#define RC_PID_NORM_OFFSET 3
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#define RC_PID_NORM_OFFSET 3
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/* Push high rates right after loading. */
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/* Push high rates right after loading. */
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#define RC_PID_FAST_START 0
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#define RC_PID_FAST_START 0
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/* Arithmetic right shift for positive and negative values for ISO C. */
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/* Arithmetic right shift for positive and negative values for ISO C. */
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#define RC_PID_DO_ARITH_RIGHT_SHIFT(x, y) \
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#define RC_PID_DO_ARITH_RIGHT_SHIFT(x, y) \
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