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wifi docs: Clarify WIFI_DYNAMIC_TX_BUFFER_NUM config item limit

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Setting WIFI_DYNAMIC_TX_BUFFER_NUM to zero is not possible.

Also edit some of the related config docs a little.
This commit is contained in:
Angus Gratton 2017-10-11 15:38:26 +11:00 committed by Angus Gratton
parent 30b40a2175
commit f3681e22de
1 changed files with 46 additions and 34 deletions
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components/esp32/Kconfig
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@ -777,44 +777,52 @@ config ESP32_WIFI_STATIC_RX_BUFFER_NUM
range 2 25
default 10
help
Set the number of WiFi static rx buffers. Each buffer takes approximately 1.6KB of RAM.
Set the number of WiFi static RX buffers. Each buffer takes approximately 1.6KB of RAM.
The static rx buffers are allocated when esp_wifi_init is called, they are not freed
until esp_wifi_deinit is called.
WiFi hardware use these buffers to receive packets, generally larger number for higher
throughput but more memory, smaller number for lower throughput but less memory.
until esp_wifi_deinit is called.
WiFi hardware use these buffers to receive all 802.11 frames.
A higher number may allow higher throughput but increases memory use.
config ESP32_WIFI_DYNAMIC_RX_BUFFER_NUM
int "Max number of WiFi dynamic RX buffers"
range 0 128
default 32
help
Set the number of WiFi dynamic rx buffers, 0 means no limitation for dynamic rx buffer
allocation. The size of dynamic rx buffers is not fixed.
For each received packet in static rx buffers, WiFi driver makes a copy
to dynamic rx buffers and then deliver it to high layer stack. The dynamic rx buffer
is freed when the application, such as socket, successfully received the packet.
For some applications, the WiFi driver receiving speed is faster than application
consuming speed, we may run out of memory if no limitation for the dynamic rx buffer
number. Generally the number of dynamic rx buffer should be no less than static
rx buffer number if it is not 0.
Set the number of WiFi dynamic RX buffers, 0 means unlimited RX buffers will be allocated
(provided sufficient free RAM). The size of each dynamic RX buffer depends on the size of
the received data frame.
For each received data frame, the WiFi driver makes a copy to an RX buffer and then delivers
it to the high layer TCP/IP stack. The dynamic RX buffer is freed after the higher layer has
successfully received the data frame.
For some applications, WiFi data frames may be received faster than the application can
process them. In these cases we may run out of memory if RX buffer number is unlimited (0).
If a dynamic RX buffer limit is set, it should be at least the number of static RX buffers.
choice ESP32_WIFI_TX_BUFFER
prompt "Type of WiFi TX buffers"
default ESP32_WIFI_DYNAMIC_TX_BUFFER
help
Select type of WiFi tx buffers and show the submenu with the number of WiFi tx buffers choice.
If "STATIC" is selected, WiFi tx buffers are allocated when WiFi is initialized and released
when WiFi is de-initialized. If "DYNAMIC" is selected, WiFi tx buffer is allocated when tx
data is delivered from LWIP to WiFi and released when tx data is sent out by WiFi.
The size of each static tx buffers is fixed to about 1.6KB and the size of dynamic tx buffers is
depend on the length of the data delivered from LWIP.
If PSRAM is enabled, "STATIC" should be selected to guarantee enough WiFi tx buffers.
If PSRAM is disabled, "DYNAMIC" should be selected to improve the utilization of RAM.
Select type of WiFi TX buffers:
If "Static" is selected, WiFi TX buffers are allocated when WiFi is initialized and released
when WiFi is de-initialized. The size of each static TX buffer is fixed to about 1.6KB.
If "Dynamic" is selected, each WiFi TX buffer is allocated as needed when a data frame is
delivered to the Wifi driver from the TCP/IP stack. The buffer is freed after the data frame
has been sent by the WiFi driver. The size of each dynamic TX buffer depends on the length
of each data frame sent by the TCP/IP layer.
If PSRAM is enabled, "Static" should be selected to guarantee enough WiFi TX buffers.
If PSRAM is disabled, "Dynamic" should be selected to improve the utilization of RAM.
config ESP32_WIFI_STATIC_TX_BUFFER
bool "STATIC"
bool "Static"
config ESP32_WIFI_DYNAMIC_TX_BUFFER
bool "DYNAMIC"
bool "Dynamic"
depends on !SPIRAM_USE_MALLOC
endchoice
@ -829,12 +837,14 @@ config ESP32_WIFI_STATIC_TX_BUFFER_NUM
range 16 64
default 32
help
Set the number of WiFi static tx buffers. Each buffer takes approximately 1.6KB of RAM.
The static rx buffers are allocated when esp_wifi_init is called, they are not released
until esp_wifi_deinit is called.
For each tx packet from high layer stack, WiFi driver make a copy of it. For some applications,
especially the UDP application, the high layer deliver speed is faster than the WiFi tx
speed, we may run out of static tx buffers.
Set the number of WiFi static TX buffers. Each buffer takes approximately 1.6KB of RAM.
The static RX buffers are allocated when esp_wifi_init() is called, they are not released
until esp_wifi_deinit() is called.
For each transmitted data frame from the higher layer TCP/IP stack, the WiFi driver makes a
copy of it in a TX buffer. For some applications especially UDP applications, the upper
layer can deliver frames faster than WiFi layer can transmit. In these cases, we may run out
of TX buffers.
config ESP32_WIFI_DYNAMIC_TX_BUFFER_NUM
int "Max number of WiFi dynamic TX buffers"
@ -842,11 +852,13 @@ config ESP32_WIFI_DYNAMIC_TX_BUFFER_NUM
range 16 64
default 32
help
Set the number of WiFi dynamic tx buffers, 0 means no limitation for dynamic tx buffer
allocation. The size of dynamic tx buffers is not fixed.
For each tx packet from high layer stack, WiFi driver make a copy of it. For some applications,
especially the UDP application, the high layer deliver speed is faster than the WiFi tx
speed, we may run out of memory if no limitation for the dynamic tx buffer number.
Set the number of WiFi dynamic TX buffers. The size of each dynamic TX buffer is not fixed,
it depends on the size of each transmitted data frame.
For each transmitted frame from the higher layer TCP/IP stack, the WiFi driver makes a copy
of it in a TX buffer. For some applications, especially UDP applications, the upper layer
can deliver frames faster than WiFi layer can transmit. In these cases, we may run out of TX
buffers.
config ESP32_WIFI_AMPDU_ENABLED
bool "WiFi AMPDU"