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Advertise a larger MSS to improve TCP performance.

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This commit is contained in:
Michael Brown
2007-01-13 17:36:17 +00:00
parent f11900a9c6
commit 526d314266
2 changed files with 33 additions and 2 deletions
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24
src/include/gpxe/tcp.h
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@@ -27,6 +27,18 @@ struct tcp_header {
uint16_t urg; /* Urgent pointer */
};
/**
* TCP MSS option
*/
struct tcp_mss_option {
uint8_t kind;
uint8_t length;
uint16_t mss;
};
/** Code for the TCP MSS option */
#define TCP_OPTION_MSS 2
/*
* TCP flags
*/
@@ -212,7 +224,17 @@ struct tcp_header {
* guess an arbitrary number that is empirically as large as possible
* while avoiding retransmissions due to dropped packets.
*/
#define TCP_WINDOW_SIZE 2048
#define TCP_WINDOW_SIZE 4096
/**
* Advertised TCP MSS
*
* We currently hardcode this to a reasonable value and hope that the
* sender uses path MTU discovery. The alternative is breaking the
* abstraction layer so that we can find out the MTU from the IP layer
* (which would have to find out from the net device layer).
*/
#define TCP_MSS 1460
/** TCP maximum segment lifetime
*