Hi again (fixed your address, I hope it will not bounce this time...)
Please test the patch attached.
On Sun, 2015-02-22 at 14:19 +0200, Emmanuel Grumbach wrote:
> Hi,
>
> On Sun, 2015-02-22 at 14:15 +0200, Valentin Manea wrote:
> > Hi,
> >
> > Recently I started using kernel 3.19 from Ubuntu ppa and I noticed a
> > big drop in Wifi throughput. After some investigation I found that my
> > router was reporting the AMPDU factor changed from 3(in 3.18) to 0(in 3.19):
> > cat
> > /sys/kernel/debug/ieee80211/phy1/netdev:wlan1/stations/c4:xx:xx:xx:xx:xx/ht_capa:
> > ht supported
> > cap: 0x1066
> > HT20/HT40
> > Dynamic SM Power Save
> > RX HT20 SGI
> > RX HT40 SGI
> > No RX STBC
> > Max AMSDU length: 3839 bytes
> > DSSS/CCK HT40
> > ampdu factor/density: 3/5
> > MCS mask: ff ff 00 00 00 00 00 00 00 00
> > MCS tx params: 1
> >
> > ht supported
> > cap: 0x1066
> > HT20/HT40
> > Dynamic SM Power Save
> > RX HT20 SGI
> > RX HT40 SGI
> > No RX STBC
> > Max AMSDU length: 3839 bytes
> > DSSS/CCK HT40
> > ampdu factor/density: 0/5
> > MCS mask: ff ff 00 00 00 00 00 00 00 00
> > MCS tx params: 1
> >
> > In my setup this means a 50% drop in downstream throughput(from
> > 160Mbit/s to 80Mbit/s)
> >
> > I tracked down the offending commit and it seems this is it:
> > iwlwifi: change max HT and VHT A-MPDU exponent
> > c064ddf318aa51647a30108f7cd151c208c62eef
> > A new mechanism was created to have per device ampd_factor:
> > - ht_info->ampdu_factor = IEEE80211_HT_MAX_AMPDU_64K;
> > + ht_info->ampdu_factor = cfg->max_ht_ampdu_exponent;
> >
> > however the max_ht_ampdu_exponent is not set for any of the iwl-6000
> > devices(including mine Intel Corporation Centrino Advanced-N 6235)
> >
> > #define IWL_DEVICE_6035 \
> > .fw_name_pre = IWL6030_FW_PRE, \
> > .ucode_api_max = IWL6035_UCODE_API_MAX, \
> > .ucode_api_ok = IWL6035_UCODE_API_OK, \
> > .ucode_api_min = IWL6035_UCODE_API_MIN, \
> > .device_family = IWL_DEVICE_FAMILY_6030, \
> > .max_inst_size = IWL60_RTC_INST_SIZE, \
> > .max_data_size = IWL60_RTC_DATA_SIZE, \
> > .nvm_ver = EEPROM_6030_EEPROM_VERSION, \
> > .nvm_calib_ver = EEPROM_6030_TX_POWER_VERSION, \
> > .base_params = &iwl6000_g2_base_params, \
> > .eeprom_params = &iwl6000_eeprom_params, \
> > .led_mode = IWL_LED_RF_STATE
> >
> > Since the original value of IEEE80211_HT_MAX_AMPDU_64K I would
> > suggest adding it to some iwl-6000 devices.
> > I did not submit any patches because I have no idea if there are
> > device which would not support this feature, however it worked before
> > with default value set to IEEE80211_HT_MAX_AMPDU_64K so I guess it must
> > be supported.
> >
>
> Thank you for your report and analysis. You saved us a lot of time.
> I'll send a fix.
From bb6f89bc21b1ebc93018bbddd5935f4badc6a12d Mon Sep 17 00:00:00 2001
From: Emmanuel Grumbach <emmanuel.grumbach@xxxxxxxxx>
Date: Sun, 22 Feb 2015 22:10:35 +0200
Subject: [PATCH] iwlwifi: fix max_ht_ampdu_exponent for older devices
The commit below didn't update the max_ht_ampdu_exponent
for the devices listed in iwl-[1-6]000.c
This had an impact in the Rx throughput. One user reported
that because of this, his downstream throughput by a half.
Fix that.
CC: <stable@xxxxxxxxxxxxxxx> [3.19]
Fixes: c064ddf318aa ("iwlwifi: change max HT and VHT A-MPDU exponent")
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@xxxxxxxxx>
---
drivers/net/wireless/iwlwifi/iwl-1000.c | 6 ++++--
drivers/net/wireless/iwlwifi/iwl-2000.c | 13 +++++++++----
drivers/net/wireless/iwlwifi/iwl-5000.c | 6 ++++--
drivers/net/wireless/iwlwifi/iwl-6000.c | 18 ++++++++++++------
4 files changed, 29 insertions(+), 14 deletions(-)
diff --git a/drivers/net/wireless/iwlwifi/iwl-1000.c b/drivers/net/wireless/iwlwifi/iwl-1000.c
index c3817fa..06f6cc0 100644
--- a/drivers/net/wireless/iwlwifi/iwl-1000.c
+++ b/drivers/net/wireless/iwlwifi/iwl-1000.c
@@ -95,7 +95,8 @@ static const struct iwl_eeprom_params iwl1000_eeprom_params = {
.nvm_calib_ver = EEPROM_1000_TX_POWER_VERSION, \
.base_params = &iwl1000_base_params, \
.eeprom_params = &iwl1000_eeprom_params, \
- .led_mode = IWL_LED_BLINK
+ .led_mode = IWL_LED_BLINK, \
+ .max_ht_ampdu_exponent = IEEE80211_HT_MAX_AMPDU_64K
const struct iwl_cfg iwl1000_bgn_cfg = {
.name = "Intel(R) Centrino(R) Wireless-N 1000 BGN",
@@ -121,7 +122,8 @@ const struct iwl_cfg iwl1000_bg_cfg = {
.base_params = &iwl1000_base_params, \
.eeprom_params = &iwl1000_eeprom_params, \
.led_mode = IWL_LED_RF_STATE, \
- .rx_with_siso_diversity = true
+ .rx_with_siso_diversity = true, \
+ .max_ht_ampdu_exponent = IEEE80211_HT_MAX_AMPDU_64K
const struct iwl_cfg iwl100_bgn_cfg = {
.name = "Intel(R) Centrino(R) Wireless-N 100 BGN",
diff --git a/drivers/net/wireless/iwlwifi/iwl-2000.c b/drivers/net/wireless/iwlwifi/iwl-2000.c
index 21e5d08..890b95f 100644
--- a/drivers/net/wireless/iwlwifi/iwl-2000.c
+++ b/drivers/net/wireless/iwlwifi/iwl-2000.c
@@ -123,7 +123,9 @@ static const struct iwl_eeprom_params iwl20x0_eeprom_params = {
.nvm_calib_ver = EEPROM_2000_TX_POWER_VERSION, \
.base_params = &iwl2000_base_params, \
.eeprom_params = &iwl20x0_eeprom_params, \
- .led_mode = IWL_LED_RF_STATE
+ .led_mode = IWL_LED_RF_STATE, \
+ .max_ht_ampdu_exponent = IEEE80211_HT_MAX_AMPDU_64K
+
const struct iwl_cfg iwl2000_2bgn_cfg = {
.name = "Intel(R) Centrino(R) Wireless-N 2200 BGN",
@@ -149,7 +151,8 @@ const struct iwl_cfg iwl2000_2bgn_d_cfg = {
.nvm_calib_ver = EEPROM_2000_TX_POWER_VERSION, \
.base_params = &iwl2030_base_params, \
.eeprom_params = &iwl20x0_eeprom_params, \
- .led_mode = IWL_LED_RF_STATE
+ .led_mode = IWL_LED_RF_STATE, \
+ .max_ht_ampdu_exponent = IEEE80211_HT_MAX_AMPDU_64K
const struct iwl_cfg iwl2030_2bgn_cfg = {
.name = "Intel(R) Centrino(R) Wireless-N 2230 BGN",
@@ -170,7 +173,8 @@ const struct iwl_cfg iwl2030_2bgn_cfg = {
.base_params = &iwl2000_base_params, \
.eeprom_params = &iwl20x0_eeprom_params, \
.led_mode = IWL_LED_RF_STATE, \
- .rx_with_siso_diversity = true
+ .rx_with_siso_diversity = true, \
+ .max_ht_ampdu_exponent = IEEE80211_HT_MAX_AMPDU_64K
const struct iwl_cfg iwl105_bgn_cfg = {
.name = "Intel(R) Centrino(R) Wireless-N 105 BGN",
@@ -197,7 +201,8 @@ const struct iwl_cfg iwl105_bgn_d_cfg = {
.base_params = &iwl2030_base_params, \
.eeprom_params = &iwl20x0_eeprom_params, \
.led_mode = IWL_LED_RF_STATE, \
- .rx_with_siso_diversity = true
+ .rx_with_siso_diversity = true, \
+ .max_ht_ampdu_exponent = IEEE80211_HT_MAX_AMPDU_64K
const struct iwl_cfg iwl135_bgn_cfg = {
.name = "Intel(R) Centrino(R) Wireless-N 135 BGN",
diff --git a/drivers/net/wireless/iwlwifi/iwl-5000.c b/drivers/net/wireless/iwlwifi/iwl-5000.c
index 332bbed..724194e 100644
--- a/drivers/net/wireless/iwlwifi/iwl-5000.c
+++ b/drivers/net/wireless/iwlwifi/iwl-5000.c
@@ -93,7 +93,8 @@ static const struct iwl_eeprom_params iwl5000_eeprom_params = {
.nvm_calib_ver = EEPROM_5000_TX_POWER_VERSION, \
.base_params = &iwl5000_base_params, \
.eeprom_params = &iwl5000_eeprom_params, \
- .led_mode = IWL_LED_BLINK
+ .led_mode = IWL_LED_BLINK, \
+ .max_ht_ampdu_exponent = IEEE80211_HT_MAX_AMPDU_64K
const struct iwl_cfg iwl5300_agn_cfg = {
.name = "Intel(R) Ultimate N WiFi Link 5300 AGN",
@@ -158,7 +159,8 @@ const struct iwl_cfg iwl5350_agn_cfg = {
.base_params = &iwl5000_base_params, \
.eeprom_params = &iwl5000_eeprom_params, \
.led_mode = IWL_LED_BLINK, \
- .internal_wimax_coex = true
+ .internal_wimax_coex = true, \
+ .max_ht_ampdu_exponent = IEEE80211_HT_MAX_AMPDU_64K
const struct iwl_cfg iwl5150_agn_cfg = {
.name = "Intel(R) WiMAX/WiFi Link 5150 AGN",
diff --git a/drivers/net/wireless/iwlwifi/iwl-6000.c b/drivers/net/wireless/iwlwifi/iwl-6000.c
index 8f2c3c8..21b2630 100644
--- a/drivers/net/wireless/iwlwifi/iwl-6000.c
+++ b/drivers/net/wireless/iwlwifi/iwl-6000.c
@@ -145,7 +145,8 @@ static const struct iwl_eeprom_params iwl6000_eeprom_params = {
.nvm_calib_ver = EEPROM_6005_TX_POWER_VERSION, \
.base_params = &iwl6000_g2_base_params, \
.eeprom_params = &iwl6000_eeprom_params, \
- .led_mode = IWL_LED_RF_STATE
+ .led_mode = IWL_LED_RF_STATE, \
+ .max_ht_ampdu_exponent = IEEE80211_HT_MAX_AMPDU_64K
const struct iwl_cfg iwl6005_2agn_cfg = {
.name = "Intel(R) Centrino(R) Advanced-N 6205 AGN",
@@ -199,7 +200,8 @@ const struct iwl_cfg iwl6005_2agn_mow2_cfg = {
.nvm_calib_ver = EEPROM_6030_TX_POWER_VERSION, \
.base_params = &iwl6000_g2_base_params, \
.eeprom_params = &iwl6000_eeprom_params, \
- .led_mode = IWL_LED_RF_STATE
+ .led_mode = IWL_LED_RF_STATE, \
+ .max_ht_ampdu_exponent = IEEE80211_HT_MAX_AMPDU_64K
const struct iwl_cfg iwl6030_2agn_cfg = {
.name = "Intel(R) Centrino(R) Advanced-N 6230 AGN",
@@ -235,7 +237,8 @@ const struct iwl_cfg iwl6030_2bg_cfg = {
.nvm_calib_ver = EEPROM_6030_TX_POWER_VERSION, \
.base_params = &iwl6000_g2_base_params, \
.eeprom_params = &iwl6000_eeprom_params, \
- .led_mode = IWL_LED_RF_STATE
+ .led_mode = IWL_LED_RF_STATE, \
+ .max_ht_ampdu_exponent = IEEE80211_HT_MAX_AMPDU_64K
const struct iwl_cfg iwl6035_2agn_cfg = {
.name = "Intel(R) Centrino(R) Advanced-N 6235 AGN",
@@ -290,7 +293,8 @@ const struct iwl_cfg iwl130_bg_cfg = {
.nvm_calib_ver = EEPROM_6000_TX_POWER_VERSION, \
.base_params = &iwl6000_base_params, \
.eeprom_params = &iwl6000_eeprom_params, \
- .led_mode = IWL_LED_BLINK
+ .led_mode = IWL_LED_BLINK, \
+ .max_ht_ampdu_exponent = IEEE80211_HT_MAX_AMPDU_64K
const struct iwl_cfg iwl6000i_2agn_cfg = {
.name = "Intel(R) Centrino(R) Advanced-N 6200 AGN",
@@ -322,7 +326,8 @@ const struct iwl_cfg iwl6000i_2bg_cfg = {
.base_params = &iwl6050_base_params, \
.eeprom_params = &iwl6000_eeprom_params, \
.led_mode = IWL_LED_BLINK, \
- .internal_wimax_coex = true
+ .internal_wimax_coex = true, \
+ .max_ht_ampdu_exponent = IEEE80211_HT_MAX_AMPDU_64K
const struct iwl_cfg iwl6050_2agn_cfg = {
.name = "Intel(R) Centrino(R) Advanced-N + WiMAX 6250 AGN",
@@ -347,7 +352,8 @@ const struct iwl_cfg iwl6050_2abg_cfg = {
.base_params = &iwl6050_base_params, \
.eeprom_params = &iwl6000_eeprom_params, \
.led_mode = IWL_LED_BLINK, \
- .internal_wimax_coex = true
+ .internal_wimax_coex = true, \
+ .max_ht_ampdu_exponent = IEEE80211_HT_MAX_AMPDU_64K
const struct iwl_cfg iwl6150_bgn_cfg = {
.name = "Intel(R) Centrino(R) Wireless-N + WiMAX 6150 BGN",
--
1.9.1
