anchao commented on a change in pull request #4070:
URL: https://github.com/apache/incubator-nuttx/pull/4070#discussion_r664114022
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File path: net/tcp/Kconfig
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@@ -106,6 +106,27 @@ config NET_TCP_FAST_RETRANSMIT_WATERMARK
missing segment, without waiting for a retransmission
timer to
expire.
+config NET_TCP_WINDOW_SCALE
+ bool "Enable TCP/IP Window Scale Option"
+ default n
+ ---help---
+ RFC1323:
+ 2. TCP WINDOW SCALE OPTION
+ The window scale extension expands the definition of
the TCP
+ window to 32 bits and then uses a scale factor to carry
this 32-
+ bit value in the 16-bit Window field of the TCP header
(SEG.WND in
+ RFC-793).
+
+if NET_TCP_WINDOW_SCALE
+
+config NET_TCP_WINDOW_SCALE_FACTOR
+ int "TCP/IP Window Scale Factor"
+ default 7
Review comment:
This factor only affects the sliding window size of receive and send,
which does not help for performance. The window factor is best to be consistent
with the iob buffer size，maybe we can calculate the scale from it.
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