The Realtek rate control algorithm goes back and forth a lot between
the highest and the lowest rate it's allowed to use. This is due to
a lot of frames being dropped because the retry limits set by
IEEE80211_CONF_CHANGE_RETRY_LIMITS are too low. (Experimentally, they
are 4 for long frames and 7 for short frames.)
The vendor drivers hardcode the value 48 for both retry limits (for
station mode), which makes dropped frames very rare and thus the rate
control is more stable.
Because most Realtek chips handle the rate control in the firmware,
which can't be modified, ignore the limits set by
IEEE80211_CONF_CHANGE_RETRY_LIMITS and use the value 48 (set during
chip initialisation), same as the vendor drivers.
Cc: [email protected]
Signed-off-by: Bitterblue Smith <[email protected]>
---
v2:
- Use Cc tag instead of Fixes.
---
drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c | 9 ---------
1 file changed, 9 deletions(-)
diff --git a/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c b/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c
index 4c76fad67150..ab4074caf191 100644
--- a/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c
+++ b/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c
@@ -6184,7 +6184,6 @@ static int rtl8xxxu_config(struct ieee80211_hw *hw, u32 changed)
{
struct rtl8xxxu_priv *priv = hw->priv;
struct device *dev = &priv->udev->dev;
- u16 val16;
int ret = 0, channel;
bool ht40;
@@ -6194,14 +6193,6 @@ static int rtl8xxxu_config(struct ieee80211_hw *hw, u32 changed)
__func__, hw->conf.chandef.chan->hw_value,
changed, hw->conf.chandef.width);
- if (changed & IEEE80211_CONF_CHANGE_RETRY_LIMITS) {
- val16 = ((hw->conf.long_frame_max_tx_count <<
- RETRY_LIMIT_LONG_SHIFT) & RETRY_LIMIT_LONG_MASK) |
- ((hw->conf.short_frame_max_tx_count <<
- RETRY_LIMIT_SHORT_SHIFT) & RETRY_LIMIT_SHORT_MASK);
- rtl8xxxu_write16(priv, REG_RETRY_LIMIT, val16);
- }
-
if (changed & IEEE80211_CONF_CHANGE_CHANNEL) {
switch (hw->conf.chandef.width) {
case NL80211_CHAN_WIDTH_20_NOHT:
--
2.38.0
> -----Original Message-----
> From: Bitterblue Smith <[email protected]>
> Sent: Sunday, January 8, 2023 11:08 PM
> To: [email protected]
> Cc: Jes Sorensen <[email protected]>; Ping-Ke Shih <[email protected]>
> Subject: [PATCH v2 2/2] wifi: rtl8xxxu: Use a longer retry limit of 48
>
> The Realtek rate control algorithm goes back and forth a lot between
> the highest and the lowest rate it's allowed to use. This is due to
> a lot of frames being dropped because the retry limits set by
> IEEE80211_CONF_CHANGE_RETRY_LIMITS are too low. (Experimentally, they
> are 4 for long frames and 7 for short frames.)
>
> The vendor drivers hardcode the value 48 for both retry limits (for
> station mode), which makes dropped frames very rare and thus the rate
> control is more stable.
>
> Because most Realtek chips handle the rate control in the firmware,
> which can't be modified, ignore the limits set by
> IEEE80211_CONF_CHANGE_RETRY_LIMITS and use the value 48 (set during
> chip initialisation), same as the vendor drivers.
>
> Cc: [email protected]
> Signed-off-by: Bitterblue Smith <[email protected]>
Reviewed-by: Ping-Ke Shih <[email protected]>
> ---
> v2:
> - Use Cc tag instead of Fixes.
> ---
> drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c | 9 ---------
> 1 file changed, 9 deletions(-)
>
> diff --git a/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c
> b/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c
> index 4c76fad67150..ab4074caf191 100644
> --- a/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c
> +++ b/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c
> @@ -6184,7 +6184,6 @@ static int rtl8xxxu_config(struct ieee80211_hw *hw, u32 changed)
> {
> struct rtl8xxxu_priv *priv = hw->priv;
> struct device *dev = &priv->udev->dev;
> - u16 val16;
> int ret = 0, channel;
> bool ht40;
>
> @@ -6194,14 +6193,6 @@ static int rtl8xxxu_config(struct ieee80211_hw *hw, u32 changed)
> __func__, hw->conf.chandef.chan->hw_value,
> changed, hw->conf.chandef.width);
>
> - if (changed & IEEE80211_CONF_CHANGE_RETRY_LIMITS) {
> - val16 = ((hw->conf.long_frame_max_tx_count <<
> - RETRY_LIMIT_LONG_SHIFT) & RETRY_LIMIT_LONG_MASK) |
> - ((hw->conf.short_frame_max_tx_count <<
> - RETRY_LIMIT_SHORT_SHIFT) & RETRY_LIMIT_SHORT_MASK);
> - rtl8xxxu_write16(priv, REG_RETRY_LIMIT, val16);
> - }
> -
> if (changed & IEEE80211_CONF_CHANGE_CHANNEL) {
> switch (hw->conf.chandef.width) {
> case NL80211_CHAN_WIDTH_20_NOHT:
> --
> 2.38.0
>
> ------Please consider the environment before printing this e-mail.