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Latency too high with 6125XLG and 5900 ?

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  • 1.  Latency too high with 6125XLG and 5900 ?

    Posted Aug 08, 2017 11:18 AM

    Hello,

    I have a question about latency in my network, which include Blade servers for virtualization.

    Topology:   HP C7000 Blade server 1 , embedding HP 6125XLG ---10G--- HP 5900AF-48G-4XG-2QSFP+---10G---HP 6125XLG embedded in HP C7000 Blade server 2

    ping from one VM in Blade server 1 to one VM in Blade server 2 takes 0,3-0,6 ms.

    Do you think those are regular values for such a network ?

    I was expecting less, since data sheets for 6125XLG and HP 5900 resp. says "Latency 1us (store and forward mode", "10 Gbps Latency < 1.5 µs (64-byte packets)".   I know calculations are a bit complicated to go from latency to actual travel time, though.

    Between 6125XLG and 5900 , 40G to 4x10G splitter cables are actually used.  All interfaces are in auto mode.

    Do you think it is possible to decrease the RTT ?

    I've heard about InfiniBand but unfortunately it is to late to go for that...

    Thanks for your tips !

     

     


    #latency
    #RTT