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Thread: "Slow" GigE, switching to Intel card will solve?

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    YUKIKAZE arthurleung's Avatar
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    "Slow" GigE, switching to Intel card will solve?

    Since I got a Dell PC2616 switch I can't run jumbo frame on my network. I iSCSI-ed all HDDs to another machine on a network (Both sides with 4xRAID0 running), but due to the slow and flawed NF4, I could only reach a peak speed of 70MBytes/sec with about 85~90% CPU usage by NF4 LoM on the slower machine.

    I'm wondering if buying an Intel Pro/1000PT desktop card will help? No one do NIC review on the net, and I don't want to buy the card then to find out it won't improve my network performance / reduce CPU load.

    Many thanks,
    Arthur
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    HEXUS.social member Agent's Avatar
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    Could you tell us a bit more about your setup ?
    These NF4 boards ? which ones are they ?
    Quote Originally Posted by Saracen View Post
    And by trying to force me to like small pants, they've alienated me.

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    Here are some quick stats. Dual Opteron 246 (2Ghz, 1MB cache), 64 Bit SUSE

    1) From an Intel Pro 1000MT dual port GigE adapter to another.

    [ ID] Interval Transfer Bandwidth
    [ 3] 0.0-10.0 sec 1.10 GBytes 941 Mbits/sec

    real 0m10.005s
    user 0m0.035s
    sys 0m0.644s

    I never saw iperf on the sending machine use more than 7% of the CPU. On the receiving system, cpu utilization was around 23%.

    Second tests...

    Client system now Athlon64 X2 Dual Core 3800+ (2Ghz, 512MB cache). With Nvidia Nforce ethernet on motherboard.

    [ 3] 0.0-10.0 sec 902 MBytes 757 Mbits/sec

    real 0m10.017s
    user 0m0.012s
    sys 0m7.904s

    1) As a client sending to a box with the intel adapter, it consumed 75-80% of one of the cores.

    Now look at the receiving side of the pic.

    [ ID] Interval Transfer Bandwidth
    [ 3] 0.0-10.0 sec 1.03 GBytes 887 Mbits/sec

    And one of the two 3800+ cores was completely pegged.

    I haven't tried the nvidia proprietary drivers, but there you have it... and your mileage with windows will vary.

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    Senior Member kalniel's Avatar
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    I think the general rule is having a dedicated NIC will improve CPU utilization and speed over an onboard one. But I don't know the facts regarding NForce 4 ethernet.

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