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Any recomendations for adjusting the TCP windows for the Bandwidth Delay Product of 12M in AIX 5.3?

  • 1.  Any recomendations for adjusting the TCP windows for the Bandwidth Delay Product of 12M in AIX 5.3?

    Posted Wed August 02, 2006 12:07 PM

    Originally posted by: SystemAdmin


    Any recomendations for adjusting the TCP windows for the Bandwidth Delay Product of 12M in AIX 5.3? I have check the performance tuning guide and the IBM redbooks, but can only find information for Linux (w/ auto-tuning).

    The IBM Web site http://publib.boulder.ibm.com/infocenter/pseries/v5r3/index.jsp?topic=/com.ibm.aix.doc/aixbman/prftungd/netperf3.htm
    only had recomenation for small RTT of 0.005ms

    I measure a RTT 84ms (ping) and computed for GigE adapter with at MTU of 9000 a BDP of 10.375MB.

    1000MBps * 0.083 sec / 8 = 10.375MB

    I set the following parameters with the "no"
    rfc1323 = 1
    tcp_recvspace = 10375000
    tcp_sendspace = 20750000
    sb_max = 41500000
    tcp_nodelayack = 1

    Most of the AIX recommandations for TCP/IP and Ethernet are for Local Area Networks (lans), this there any better tuning tips for Wide Area Networks (wans)?


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