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We have downloaded your implementation of SCTP and compiled it. My
assignment is to write a ttcp-like application to measure the
thruput of SCTP. I am using the code from ttcp to do the calculations but
obviously I must not know where to put the prep_timer() and read_timer()
functions. I placed the prep_timer()--to begin timing--in the
communicationUpNotif() function and the read_timer() to get the time
elapsed in the shutdownCompleteNotif() function for both transmitter and
receiver. I modeled the receiver after your discard_server and the
transmitter is something like your echo_tool.
Following are the numbers using ttcp:
./ttcp -t -s 160.91.192.149
ttcp-t: buflen=8192, nbuf=2048, align=16384/0, port=5001 tcp ->
160.91.192.149
ttcp-t: socket
ttcp-t: connect
ttcp-t: 16777216 bytes in 1.85 real seconds = 69.24 Mbit/sec +++
ttcp-t: 16777216 bytes in 0.05 CPU seconds = 2560.00 Mbit/cpu sec
ttcp-t: 2048 I/O calls, msec/call = 0.92, calls/sec = 1107.90
ttcp-t: 0.0user 0.0sys 0:01real 2% 0i+0d 0maxrss 0+2pf 0+0csw
ttcp-t: buffer address 0x8050000

./ttcp -r -s -b 200000
ttcp-r: buflen=8192, nbuf=2048, align=16384/0, port=5001,
sockbufsize=200000 tcp
ttcp-r: socket
ttcp-r: rcvbuf
ttcp-r: accept from 160.91.192.165
ttcp-r: 16777216 bytes in 1.88 real seconds = 68.19 Mbit/sec +++
ttcp-r: 16777216 bytes in 0.80 CPU seconds = 160.00 Mbit/cpu sec
ttcp-r: 11210 I/O calls, msec/call = 0.17, calls/sec = 5971.92
ttcp-r: 0.0user 0.7sys 0:01real 42% 0i+0d 0maxrss 0+2pf 0+0csw
ttcp-r: buffer address 0x8050000

Following are the numbers using the SCTP implementation:
./scttcp -t -l 8192 -n 2048 -d 160.91.192.149 -s 160.91.192.165
sctp-t: 16777216 bytes in 44.03 real seconds = 2.91 Mbit/sec +++
sctp-t: 2048 I/O calls, msec/call = 22.01, calls/sec = 46.52

./scttcp -r -s 160.91.192.149
sctp-r: 16777216 bytes in 44.03 real seconds = 2.91 Mbit/sec +++
sctp-r: 2048 I/O calls, msec/call = 22.01, calls/sec = 46.52

Also, we were wondering how we might change/increase the socket buffer
sizes and the window sizes? I am not sure exactly how raw sockets act in
this regard. The SCTP implementation starts out fine but then more
than half-way thru it slows way down and begins to creep along. I just
want to make sure I am measuring things fairly and accurately.

Thank you.

Florence M Fowler

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• [SCTP-Discussion] SCTP & ttcp, Florence M Fowler, 11/07/2001
  • Re: [SCTP-Discussion] SCTP & ttcp, Michael Tuexen, 11/07/2001

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