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Date:      Tue, 10 Feb 2004 10:32:28 +0200
From:      Danny Braniss <danny@cs.huji.ac.il>
To:        freebsd-hackers@freebsd.org
Cc:        freebsd-net@freebsd.org
Subject:   TTCP/RFC1644 problem
Message-ID:  <E1AqTJk-0009aT-Ea@cs.huji.ac.il>
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hi,
	im running some experiments, and it seems to me that
setting net.inet.tcp.rfc1644 has the reverse effect.
with sysctl net.inet.tcp.rfc1644 = 0, the transaction uses only 6 packets
and it's less than 1 sec, setting net.inet.tcp.rfc1644 to 1 uses
8 packets and takes more than 1 sec.

with net.inet.tcp.rfc1644 = 0:
    No. Time        Source                Destination           Protocol Info
      1 0.000000    132.65.80.32          132.65.16.103         TCP      4105 >
 255 [SYN] Seq=3300562868 Ack=0 Win=57920 Len=0
      2 0.000038    132.65.16.103         132.65.80.32          TCP      255 > 
4105 [SYN, ACK] Seq=3867169834 Ack=3300562869 Win=57344 Len=0
      3 0.003137    132.65.80.32          132.65.16.103         TCP      4105 >
 255 [FIN, PSH, ACK] Seq=3300562869 Ack=3867169835 Win=57920 Len=25
      4 0.003215    132.65.16.103         132.65.80.32          TCP      255 > 
4105 [ACK] Seq=3867169835 Ack=3300562895 Win=57895 Len=0
      5 0.035350    132.65.16.103         132.65.80.32          TCP      255 > 
4105 [FIN, PSH, ACK] Seq=3867169835 Ack=3300562895 Win=57920 Len=4
      6 0.038110    132.65.80.32          132.65.16.103         TCP      4105 >
 255 [ACK] Seq=3300562895 Ack=3867169840 Win=57916 Len=0


with net.inet.tcp.rfc1644 = 1:
    No. Time        Source                Destination           Protocol Info
      1 0.000000    132.65.80.32          132.65.16.103         TCP      4108 >
 255 [FIN, SYN, PSH] Seq=967743282 Ack=0 Win=57600 Len=25
      2 0.000036    132.65.16.103         132.65.80.32          TCP      255 > 
4108 [SYN, ACK] Seq=99082279 Ack=967743283 Win=57344 Len=0
      3 0.002622    132.65.80.32          132.65.16.103         TCP      4108 >
 255 [FIN, ACK] Seq=967743308 Ack=99082280 Win=57920 Len=0
      4 0.002671    132.65.16.103         132.65.80.32          TCP      255 > 
4108 [ACK] Seq=99082280 Ack=967743283 Win=57920 Len=0
      5 1.201556    132.65.80.32          132.65.16.103         TCP      4108 >
 255 [FIN, PSH, ACK] Seq=967743283 Ack=99082280 Win=57920 Len=25
      6 1.201609    132.65.16.103         132.65.80.32          TCP      255 > 
4108 [ACK] Seq=99082280 Ack=967743309 Win=57895 Len=0
      7 1.227906    132.65.16.103         132.65.80.32          TCP      255 > 
4108 [FIN, PSH, ACK] Seq=99082280 Ack=967743309 Win=57920 Len=4
      8 1.230653    132.65.80.32          132.65.16.103         TCP      4108 >
 255 [ACK] Seq=967743309 Ack=99082285 Win=57916 Len=0

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