lwip: Allow configuring/disabling some TCP options to save RAM
RAM savings are small, but may add up when running large numbers of sockets.
This commit is contained in:
Angus Gratton
Angus Gratton
parent
8aa09aea10
commit
1c6510ed96
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@ -68,6 +68,8 @@ config LWIP_IP_REASSEMBLY
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help
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Enabling this option allows reassemblying incoming fragmented IP packets.
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menu "TCP"
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config TCP_MAXRTX
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int "Maximum number of retransmissions of data segments"
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default 12
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@ -82,6 +84,79 @@ config TCP_SYNMAXRTX
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help
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Set maximum number of retransmissions of SYN segments.
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config TCP_MSS
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int "Maximum Segment Size (MSS)"
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default 1436
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range 1220 1436
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help
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Set maximum segment size for TCP transmission.
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Can be set lower to save RAM, the default value 1436 will give best throughput.
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config TCP_SND_BUF_DEFAULT
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int "Default send buffer size"
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default 5744 # 4 * default MSS
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range 2440 65535
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help
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Set default send buffer size for new TCP sockets.
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Per-socket send buffer size can be changed at runtime
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with lwip_setsockopt(s, TCP_SNDBUF, ...).
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This value must be at least 2x the MSS size, and the default
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is 4x the default MSS size.
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Setting a smaller default SNDBUF size can save some RAM, but
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will decrease performance.
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config TCP_WND_DEFAULT
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int "Default receive window size"
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default 5744 # 4 * default MSS
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range 2440 65535
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help
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Set default TCP receive window size for new TCP sockets.
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Per-socket receive window size can be changed at runtime
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with lwip_setsockopt(s, TCP_WINDOW, ...).
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Setting a smaller default receive window size can save some RAM,
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but will significantly decrease performance.
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config TCP_QUEUE_OOSEQ
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bool "Queue incoming out-of-order segments"
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default y
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help
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Queue incoming out-of-order segments for later use.
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Disable this option to save some RAM during TCP sessions, at the expense
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of increased retransmissions if segments arrive out of order.
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choice TCP_OVERSIZE
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prompt "Pre-allocate transmit PBUF size"
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default TCP_OVERSIZE_MSS
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help
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Allows enabling "oversize" allocation of TCP transmission pbufs ahead of time,
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which can reduce the length of pbuf chains used for transmission.
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This will not make a difference to sockets where Nagle's algorithm
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is disabled.
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Default value of MSS is fine for most applications, 25% MSS may save
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some RAM when only transmitting small amounts of data. Disabled will
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have worst performance and fragmentation characteristics, but uses
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least RAM overall.
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config TCP_OVERSIZE_MSS
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bool "MSS"
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config TCP_OVERSIZE_QUARTER_MSS
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bool "25% MSS"
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config TCP_OVERSIZE_DISABLE
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bool "Disabled"
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endchoice
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endmenu # TCP
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config LWIP_DHCP_DOES_ARP_CHECK
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bool "Enable an ARP check on the offered address"
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default y
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@ -69,7 +69,7 @@
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#include "lwip/memp.h"
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#include "lwip/pbuf.h"
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#include "lwip/sys.h"
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#if LWIP_TCP && TCP_QUEUE_OOSEQ
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#if LWIP_TCP && (TCP_QUEUE_OOSEQ || ESP_LWIP)
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#include "lwip/priv/tcp_priv.h"
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#endif
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#if LWIP_CHECKSUM_ON_COPY
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@ -284,7 +284,7 @@
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* TCP_QUEUE_OOSEQ==1: TCP will queue segments that arrive out of order.
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* Define to 0 if your device is low on memory.
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*/
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#define TCP_QUEUE_OOSEQ 1
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#define TCP_QUEUE_OOSEQ CONFIG_TCP_QUEUE_OOSEQ
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/*
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* LWIP_EVENT_API==1: The user defines lwip_tcp_event() to receive all
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@ -292,7 +292,7 @@
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* LWIP_CALLBACK_API==1: The PCB callback function is called directly
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* for the event. This is the default.
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*/
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#define TCP_MSS 1460
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#define TCP_MSS CONFIG_TCP_MSS
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/**
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* TCP_MAXRTX: Maximum number of retransmissions of data segments.
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@ -309,6 +309,24 @@
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*/
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#define TCP_LISTEN_BACKLOG 1
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/**
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* TCP_OVERSIZE: The maximum number of bytes that tcp_write may
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* allocate ahead of time
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*/
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#ifdef CONFIG_TCP_OVERSIZE_MSS
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#define TCP_OVERSIZE TCP_MSS
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#endif
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#ifdef CONFIG_TCP_OVERSIZE_QUARTER_MSS
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#define TCP_OVERSIZE (TCP_MSS/4)
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#endif
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#ifdef CONFIG_TCP_OVERSIZE_DISABLE
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#define TCP_OVERSIZE 0
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#endif
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#ifndef TCP_OVERSIZE
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#error "One of CONFIG_TCP_OVERSIZE_xxx options should be set by sdkconfig"
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#endif
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/*
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----------------------------------
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---------- Pbuf options ----------
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@ -673,8 +691,8 @@
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#define ESP_DHCP_TIMER 1
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#define ESP_LWIP_LOGI(...) ESP_LOGI("lwip", __VA_ARGS__)
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#define TCP_WND_DEFAULT (4*TCP_MSS)
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#define TCP_SND_BUF_DEFAULT (4*TCP_MSS)
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#define TCP_WND_DEFAULT CONFIG_TCP_WND_DEFAULT
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#define TCP_SND_BUF_DEFAULT CONFIG_TCP_SND_BUF_DEFAULT
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#if ESP_PERF
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#define DBG_PERF_PATH_SET(dir, point)
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@ -110,9 +110,11 @@ static void dbg_lwip_tcp_pcb_one_show(struct tcp_pcb* pcb)
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seg = pcb->unacked;
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DBG_LWIP_SEG_SHOW(seg);
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ESP_LWIP_LOGI("ooseg semengts:");
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#if TCP_QUEUE_OOSEQ
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ESP_LWIP_LOGI("ooseq semengts:");
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seg = pcb->ooseq;
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DBG_LWIP_SEG_SHOW(seg);
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#endif
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ESP_LWIP_LOGI("refused data=%p", pcb->refused_data);
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