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From Marc Slemko <ma...@znep.com>
Subject Re: ack re: [PATCH] performance improvement
Date Sat, 01 Feb 1997 08:36:44 GMT
On Fri, 31 Jan 1997, Dean Gaudet wrote:

> BTW, if anyone wants to test a *BSD or other system to see what writev() 
> does I've included a test program.  Run it with the ip addr of a webserver
> and port 80 as args, and it fires 300 'x's at the port in 3 100 byte hunks
> using writev().  Watch the wire with tcpdump to see how many data packets
> are involved. 

FYI, from BSD to BSD I get:

08:28:02.394944 darkly.worldgate.com.1483 > valis.worldgate.com.1234: S 1126912000:1126912000(0)
win 16384 <mss 1460,nop,wscale 0,nop,nop,timestamp 281357 2466181682,opt-62:0600440000004a>
(DF)
08:28:02.395582 valis.worldgate.com.1234 > darkly.worldgate.com.1483: S 3516878142:3516878142(0)
ack 1126912001 win 8760 <mss 1460,nop,wscale 0,nop,nop,timestamp 265482 2466181682>
08:28:02.396036 darkly.worldgate.com.1483 > valis.worldgate.com.1234: . ack 1 win 17376
<nop,nop,timestamp 278200 278495> (DF)
08:28:02.396632 darkly.worldgate.com.1483 > valis.worldgate.com.1234: P 1:301(300) ack
1 win 17376 <nop,nop,timestamp 278200 278495> (DF)
08:28:02.397787 darkly.worldgate.com.1483 > valis.worldgate.com.1234: F 301:301(0) ack
1 win 17376 <nop,nop,timestamp 278200 278495> (DF)
08:28:02.398232 valis.worldgate.com.1234 > darkly.worldgate.com.1483: . ack 302 win 8460
<nop,nop,timestamp 278495 278200>
08:28:02.403382 valis.worldgate.com.1234 > darkly.worldgate.com.1483: F 1:1(0) ack 302
win 8760 <nop,nop,timestamp 278495 278200>
08:28:02.403849 darkly.worldgate.com.1483 > valis.worldgate.com.1234: . ack 2 win 17376
<nop,nop,timestamp 278200 278495> (DF)

Looks fine.


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