test-suite-tcp-init-win.txt
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上传日期:2015-12-11
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通讯编程
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- The tests of options for TCP's initial window can be tested
- with the command "./test-all-tcp-init-win" in the directory
- tcl/test.
- These tests verify the following options added to the
- implementations of one-way TCP. The proposal in the
- internet draft "Increasing TCP's Initial Window" can be
- modeled by setting syn_ and delay_growth_ to true, and
- setting windowInitOption_ to 2.
- For these parameters, the model implemented in the simulator for
- one-way TCP is as follows: the sender sends a 40-byte data packet
- (modeling the SYN), the receiver sends an ACK, and the sender then
- sets its initial window to either two, three, or four segments,
- depending on the segment size. If the first packet (i.e., the SYN)
- is dropped, then the initial window is started at one segment.
- Agent/TCP, syn_:
- For the default, with "syn_" set to false, TCP does not model the
- initial SYN/ACK exchange. With "syn_" set to true, TCP does model
- the initial SYN/ACK exchange, in that for "syn_" set to true, the
- initial packet is of size tcpip_base_hdr_size_ (40 bytes).
- Agent/TCP, delay_growth_:
- For the default, with delay_growth_ set to false, the initial window
- applies to the first packet. With delay_growth_ set to true,
- the initial congestion window only applies after a single packet
- has been sent and acknowledged.
- Agent/TCP, windowInitOption_:
- For the default, with "windowInitOption_" set to 1, the TCP initial
- window is set to the number of packets specified in "windowInit_",
- which itself is set by default to one packet. For "windowInitOption_"
- set to 2, the TCP initial window is set to the number of packets
- specified in internet draft draft-floyd-incr-init-win-01.txt on
- "Increasing TCP's Initial Window". That is, for a packet size of
- at most 1095 bytes, the initial window is set to four packets.
- For a packet size between 1095 and 2190 bytes, the initial window
- is set to three packets, and for a packet size of 2190 bytes or
- more, the initial window is set to two packets.
- --------------------------------------
- The first tests, tahoe1 to tahoe4, test the initial window options
- with Tahoe TCP.
- The three connections in the tahoe1 test all use "syn_" and
- "delay_growth_" set to true, and "windowInitOption_" set to 2,
- for the initial window specified in the internet draft.
- The packet sizes for these three connections are 1000 bytes, 1500 bytes,
- and 4000 bytes, respectively.
- The three connections in the tahoe2 test use various combinations
- of fixed initial windows, with "windowInitOption_" set to 1.
- Two of the connections use an initial window of six packets, and
- one uses an initial window of one packet.
- The connection in the tahoe3 test shows that with "windowInitOption_"
- set to 2, when the initial (SYN) packet is dropped, the larger initial
- window is not used.
- "Init4" shows two connections with 1000-byte packets using the initial
- window specified in the internet draft. The test shows that after a
- Fast Retransmit, TCP slow-starts from an initial window of one packet.
- These four tests are then repeated for Reno, NewReno, and SACK TCP.