From mboxrd@z Thu Jan 1 00:00:00 1970 From: Wei Yongjun Date: Tue, 22 Apr 2008 04:29:37 +0000 Subject: Re: [PATCH] SCTP: Fix DATA retransmit after fast retransmit Message-Id: <480D69B1.2020200@cn.fujitsu.com> MIME-Version: 1 Content-Type: multipart/mixed; boundary="------------000401050303050004070103" List-Id: References: <48085441.2030904@cn.fujitsu.com> In-Reply-To: <48085441.2030904@cn.fujitsu.com> To: linux-sctp@vger.kernel.org This is a multi-part message in MIME format. --------------000401050303050004070103 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Hi Vlad: The test sequence is the same as yours. The data flow see the following. If you can receive attachment, see the tcpdump file in the attachment. Endpoint A Endpoint B DATA (TSN = 1) -------------> DATA (TSN = 2) -- (lost)----> DATA (TSN = 3) -------------> DATA (TSN = 4) -------------> <------------- SACK (CTSN = 1) DATA (TSN = 5) -------------> <------------- SACK (CTSN = 1, GAP-START = 2, GAP-ENT = 2) <------------ SACK (CTSN = 1, GAP-START = 2, GAP-ENT = 3) <------------ SACK (CTSN = 1, GAP-START = 2, GAP-ENT = 4) DATA (TSN = 2) -(fast rtx)--> <---(lost)---- SACK (CTSN = 5) NO DATA send --(t3-rtx)---- HEARTBEAT -(hb rtx1)--> HEARTBEAT -(hb rtx1)--> I do not know what packet generater you used for test, maybe it send too fast, I think If you do same delay before send SACK (CTSN = 1, GAP=3,4,5), you can find this problem. Wei Yongjun Vlad Yasevich wrote: > Hi Wei > > I am attempting to reproduce this scenario and trying to understand > the packet sequence. > > I have tried the following simple scenario and it works correctly: > > Endpoint A Endpoint B > DATA (TSN = 1) -------------> > <------------- SACK (CTSN = 1) > > DATA (TSN = 2) -- (lost)----> > DATA (TSN = 3) -------------> > <------------- SACK (CTSN = 1, GAP = 3) > > DATA (TSN = 4) -------------> > <------------ SACK (CTSN = 1, GAP = 3,4) > > DATA (TSN = 5) -------------> > <------------ SACK (CTSN = 1, GAP = 3,4,5) > > DATA (TSN = 2) -(fast rtx)--> > <---(lost)---- SACK (CTSN = 5) > > DATA (TSN = 2) -(t3 rtx) ---> > > The T3_RTX retransmission happens because at the initial sending > of TSN 2 (the one that was lost), the rtx timer was set and > running. It was never reset since not all outstanding chunks > have been acknowledged. > > Can you describe the SACKs in your scenario with CTSN and GAP breakdowns > so I can try to reproduce it. --------------000401050303050004070103 Content-Type: application/octet-stream; name="1.html.Link0.dump" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="1.html.Link0.dump" 1MOyoQIABAAAAAAAAAAAANAHAAABAAAAVvUNSEzyAgA8AAAAPAAAAP///////wAMKVfwxggG AAEIAAYEAAEADClX8MbAqAAVAAAAAAAAwKgAZAAAAAAAAAAAAAAAAAAAAAAAAFb1DUg0cwwA PAAAADwAAAD///////8ADClX8MYIBgABCAAGBAABAAwpV/DGwKgAFQAAAAAAAMCoAGQAAAAA AAAAAAAAAAAAAAAAAABX9Q1I+jsGADwAAAA8AAAA////////AAwpV/DGCAYAAQgABgQAAQAM KVfwxsCoABUAAAAAAADAqABkAAAAAAAAAAAAAAAAAAAAAAAAWPUNSDmKCQBCAAAAQgAAAAAM KVfwxgAAAAABAAgARQAANAAAAAD/ATn/wKgAZMCoABUIAMQ+//8AAUVjaG9EYXRhRWNob0Rh dGFFY2hvRGF0YVj1DUiRjgkAPAAAADwAAAD///////8ADClX8MYIBgABCAAGBAABAAwpV/DG wKgAFQAAAAAAAMCoAGQAAAAAAAAAAAAAAAAAAAAAAABY9Q1Ijz4LACoAAAAqAAAAAAwpV/DG 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