TCP performance analysis

Discussion in 'Linux Networking' started by cranium.2003, May 26, 2005.

  1. cranium.2003

    cranium.2003 Guest

    Does anyone knows how to interpret results from TTCP performance
    I executed ttcp -r -s on PC1 and ttcp -t -s My results on
    PC1 is
    ttcp -r -s
    ttcp-r: buflen=8192, nbuf=2048, align=16384/0, port=5001 tcp
    ttcp-r: socket
    ttcp-r: accept from
    ttcp-r: 16777216 bytes in 14.89 real seconds = 1100.66 KB/sec +++
    ttcp-r: 11573 I/O calls, msec/call = 1.32, calls/sec = 777.46
    ttcp-r: 0.0user 0.0sys 0:14real 0% 0i+0d 0maxrss 0+2pf 0+0csw
    I am unable to get last two lines. can anybody help me to understand
    cranium.2003, May 26, 2005
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  2. cranium.2003

    Rick Jones Guest

    The second to last line claims that ttcp make 11573 I/O calls (eg
    send/recv), that each call took (on average I presume) 1.32
    milliseconds, and that it was making those calls at a rate of 777.46
    per second.

    The last like is (perhaps bogusly depending on what calls it made to
    get it) that there was 0.0 seconds of CPU time in user mode, 0.0
    seconds of CPU time in "system" (kernel) mode and 14 seconds of wall
    clock time. Alas I'm not familiar with the last bits on the last line.

    rick jones

    shameless plug time - you might want to look into netperf -
    Rick Jones, May 26, 2005
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