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CONFIG_NET_TCP_RETRY_COUNT¶
Maximum number of TCP segment retransmissions
Type: int
Help¶
The following formula can be used to determine the time (in ms) that a segment will be be buffered awaiting retransmission: n=NET_TCP_RETRY_COUNT Sum((1<<n) * NET_TCP_INIT_RETRANSMISSION_TIMEOUT) n=0 With the default value of 9, the IP stack will try to retransmit for up to 1:42 minutes. This is as close as possible to the minimum value recommended by RFC1122 (1:40 minutes). Only 5 bits are dedicated for the retransmission count, so accepted values are in the 0-31 range. It’s highly recommended to not go below 9, though. Should a retransmission timeout occur, the receive callback is called with -ECONNRESET error code and the context is dereferenced.
Direct dependencies¶
NET_TCP && !NET_RAW_MODE && NETWORKING
(Includes any dependencies from if’s and menus.)
Defaults¶
- 9 if
NET_TCP&& !NET_RAW_MODE&&NETWORKING
Kconfig definition¶
At subsys/net/ip/Kconfig:274
Included via Kconfig:10 → Kconfig.zephyr:39 → subsys/Kconfig:24 → subsys/net/Kconfig:82
Menu path: (top menu) → Networking → IP stack
config NET_TCP_RETRY_COUNT
int
prompt "Maximum number of TCP segment retransmissions" if NET_TCP && !NET_RAW_MODE && NETWORKING
default 9 if NET_TCP && !NET_RAW_MODE && NETWORKING
depends on NET_TCP && !NET_RAW_MODE && NETWORKING
help
The following formula can be used to determine the time (in ms)
that a segment will be be buffered awaiting retransmission:
n=NET_TCP_RETRY_COUNT
Sum((1<<n) * NET_TCP_INIT_RETRANSMISSION_TIMEOUT)
n=0
With the default value of 9, the IP stack will try to
retransmit for up to 1:42 minutes. This is as close as possible
to the minimum value recommended by RFC1122 (1:40 minutes).
Only 5 bits are dedicated for the retransmission count, so accepted
values are in the 0-31 range. It's highly recommended to not go
below 9, though.
Should a retransmission timeout occur, the receive callback is
called with -ECONNRESET error code and the context is dereferenced.
(Definitions include propagated dependencies, including from if’s and menus.)