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This patch corrects the conditions under which a SACK will be piggybacked on a DATA packet. The previous condition was incorrect due to a misinterpretation of RFC 4960 and/or RFC 2960. Specifically, the following paragraph from section 6.2 had not been implemented correctly: Before an endpoint transmits a DATA chunk, if any received DATA chunks have not been acknowledged (e.g., due to delayed ack), the sender should create a SACK and bundle it with the outbound DATA chunk, as long as the size of the final SCTP packet does not exceed the current MTU. See Section 6.2. When about to send a DATA chunk, the code now checks to see if the SACK timer is running. If it is, we know we have a SACK to send to the peer, so we append the SACK (assuming available space in the packet) and turn off the timer. For a simple request-response scenario, this will result in the SACK being bundled with the response, meaning the the SACK is received quickly by the client, and also meaning that no separate SACK packet needs to be sent by the server to acknowledge the request. Prior to this patch, a separate SACK packet would have been sent by the server SCTP only after its delayed-ACK timer had expired (usually 200ms). This is wasteful of bandwidth, and can also have a major negative impact on performance due the interaction of delayed ACKs with the Nagle algorithm. Signed-off-by: Doug Graham <dgraham@nortel.com> Signed-off-by: Vlad Yasevich <vladislav.yasevich@hp.com> |
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| .. | ||
| associola.c | ||
| auth.c | ||
| bind_addr.c | ||
| chunk.c | ||
| command.c | ||
| debug.c | ||
| endpointola.c | ||
| input.c | ||
| inqueue.c | ||
| ipv6.c | ||
| Kconfig | ||
| Makefile | ||
| objcnt.c | ||
| output.c | ||
| outqueue.c | ||
| primitive.c | ||
| proc.c | ||
| protocol.c | ||
| sm_make_chunk.c | ||
| sm_sideeffect.c | ||
| sm_statefuns.c | ||
| sm_statetable.c | ||
| socket.c | ||
| ssnmap.c | ||
| sysctl.c | ||
| transport.c | ||
| tsnmap.c | ||
| ulpevent.c | ||
| ulpqueue.c | ||