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FTP Latency

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  • 15th March 2010 at 10:01 #61479
    Urgent
    Guest

    Dears,
    Help really appreciate; I need reasons of high FTP Latency time; the target is 800 ms but some time is higher than that value without performance issue at CS!!!

    17th March 2010 at 08:04 #61480
    sam
    Guest

    The FTP latency comes due to server or PDSN issue

    17th March 2010 at 12:08 #61481
    Urgent
    Guest

    More information will be highly appreciated; as we know latency is end to end then the reason could be any part of the syst.yes? how we can find the reason?

    Regards

    17th March 2010 at 13:44 #61482
    pix
    Guest

    hi urgent,

    ideally, you should do some traces on the Abis interface :
    check how long it takes to establish a UL TBF,
    how long it takes to send the RLC blocks,
    how long it takes before a reply is received from network,
    and how long it takes to establish a DL TBF.

    If TBF establishment is quick enough, then investigate the network side. Ping the GGSN, then ping a server located on same network as GGSN, then your gateway to get out of your packet CN, and then to a server on internet.

    See how the different servers generate different response times.

    Also, regarding the TBF estab, try doing several consecutive pings : the 1st ping takes more time because TBF must be established. The next ping should be much faster because the TBF are already established and “re-used” for the second ping.

    Cheers
    pix

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