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Thread: NIC Throughput

  1. #1
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    NIC Throughput

    Hi Philip!

    Under your NIC optimization recommendation, I have noticed that it is geared towards minimizing latency. How about “throughput”. What would be a good values for its parameters?

    Thanks a lot

  2. #2
    Administrator Philip's Avatar
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    Hello

    It really depends on what part of your system is loaded less, the NIC or the CPU. In most scenarios, it is better if the NIC does less packet/header manipulation and fewer calculations, i.e. the low-latency recommendations already do that.

    I would disable any "Offloads", leave only checksum calculations to the NIC. You can increase receive/transmit buffers to 512 if your NIC has the defaults at 256 and your system has enough RAM.

    Other than that, I wouldn't enable Gigabit jumbo frames for pure Internet throughput, because anything over 1500 bytes would have to be fragmented before being transmitted, likely by your modem/router.

  3. #3
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    Would you suggest:

    Interrupt Moderation = Adaptive (I can't see any effect)

    Flow Control = Enable (I'm able to maximize my speed with this "on" specially with VPN)
    Last edited by MagikMark; 03-13-18 at 11:41 PM.

  4. #4
    Administrator Philip's Avatar
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    Interrupt moderation (coalescing) - It allows the NIC to delay interrupting the CPU for new traffic. It adds some latency because of that, the benefit being a bit lower CPU utilization. If you are not CPU-bound it is better either disabled for low latency, or at a very conservative setting for pure throughput.

    Flow Control - the idea is to slow down the sending device when the recipient can't handle the speed of transfer. There are a number of issues with it, however:
    - it doesn't work well in mixed Gigabit/Megabit LAN environments, or if one port on a switch gets congested all links get slowed down
    - you must disable it if you plan on using QoS
    - some NICs drivers perform poorly with it
    - TCP/IP already implements a form of flow control
    It is generally better disabled for those reasons, but you'd have to test to see what works better in your environment.

  5. #5
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    How about

    Adaptive-InterFrame Spacing? On?

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    Adaptive InterFrame Spacing will only show noticeable difference where there are many packet collisions, typically in some Gigabit LANs. I don't think it will have any perceivable effect either way on your Internet connectivity, but I disable it on my personal machine to simplify and reduce unnecessary services.

  7. #7
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    Philip,

    1. When you're connected to a VPN, then you become part of its LAN (VPN Provider LAN). Am I right?

    Flow Control & Adaptive Interframe have immediate detrimental effect on speed when it's turned off. As low as 50%
    if Flow Control is off and Speed fluctuations when Adaptive Interframe is off

    2. I have noticed in BIOS setting of my Intel NIC has a maximum link speed of 100Mbps. On the other hand under
    Windows 10 it offers up to 1Gbps link speed. Which shall we follow?

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