Date: Tue, 10 Feb 2004 13:02:05 -0500 From: Karim Fodil-Lemelin <kfl@xiphos.ca> To: Danny Braniss <danny@cs.huji.ac.il> Cc: freebsd-net@freebsd.org Subject: Re: TTCP/RFC1644 problem Message-ID: <40291C9D.5090403@xiphos.ca> In-Reply-To: <E1AqTJk-0009aT-Ea@cs.huji.ac.il> References: <E1AqTJk-0009aT-Ea@cs.huji.ac.il>
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Hi,
Your problem here is that your TTCP connection times out and the
data is retransmitted (loosing all the benefits of TTCP) see my other
email for why this happens.
Karim.
Danny Braniss wrote:
>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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