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Subject: Re: [m5sim-users] packet tracing Date: Thursday 22 June 2006 15:08 From: Yu Zhang <[EMAIL PROTECTED]> To: Nathan Binkert <[EMAIL PROTECTED]> Hi Nathan, Thanks for the reply. But I'm quite sure that I wait long enough, since my script is like: echo -n "running mybench4 client..." /bin/bash -c "cd /benchmarks/mybench4 && ./client yuzhang 5678" echo "done." echo -n "halting machine" m5 exit So, when the work is done, the simulation will terminate automatically. I only send 1 message to the server. The message sent is 32768 bytes long, when I drop the 13th, 14th, 15th, 17th, 19th, 21st packets, the file dumped is attachted as '1'. One packet was retransmitted using fast retransmission mode and other 5 packets were retransmitted using normal retransmission mode. But, when I drop the 11th, 13th, 15th, 17th, 19th, 21st packets, the file dumped is attached as '2'. Only 2 packets were retransmitted, 1 used fast retransmission, the other used normal retransmission. You can see the difference between the two dumpfiles. I'm quite confused why in the second case the simulation terminated so early. Thanks, Yu On Thursday 22 June 2006 12:15, you wrote: > I'll assume that you're talking about TCP, and that each packet you speak > of is an unfragmented TCP packet. If this is not the case, you'll need to > exaplain more. > > What's probably biting you is the fact that TCP has two retransmission > modes: fast retransmit, and normal retransmit. The first two packets are > probably being fast retransmitted which is why you see them, and the rest > of the packets are probably waiting for the timeout for normal retransmit > which takes a very long time (i.e. probably much longer than you're > waiting). See Steven's TCP/IP Illustrated Vol. 1 for more details. > > Nathan -------------------------------------------------------
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