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Solved: Slow-ish transfer speeds over network

Discussion in 'Networking' started by BigTobster, May 8, 2014.

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  1. BigTobster

    BigTobster Thread Starter

    Joined:
    Feb 26, 2011
    Messages:
    173
    Hi

    I am transferring some files over my network using the Python SimpleHTTPServer on a Xubuntu box.

    Code:
    Code:
    python -m SimpleHTTPServer
    The server is a mediocre, 4-5 year old machine AKA David. I don't have the exact specs to hand but it was bargain bucket in 2009

    The client is a big powerful monster of a machine. Big games rig. AKA Goliath.

    The router has a theoretical transfer speed of 300Mb/s. It's a TP-Link TL-WR841N.

    My actual non-concurrent download speed is ~ 4Mb/s.

    This isn't really my area and I was wondering if anyone can explain why this is? All connections are via Ethernet cable. David is connected via Ethernet. Goliath is connected via Ethernet to a Powerline Adapter which in turn is Ethernet connected. Over wireless, I am getting ~1.5Mb/s.

    I'm not expecting the full theoretical maximum but surely better than 4Mb/s? Is there anyway to improve this? Why am I getting such a slow connection? I'm interested in the academic side of things here as well as the technical solution (if any) :)

    My theory is that my rubbish-y old network card is throttling. Possible?

    Thanks
     
  2. Oddba11

    Oddba11

    Joined:
    May 12, 2011
    Messages:
    7,203
    First Name:
    Jim
    Several things here. First, the NIC(s) used can affect the speed, even the driver version can have an affect. Second, how each NIC is connected and configured (ie: 10half, 10Full, 100half, 100Full, etc.).

    Verify the configuration end to end. Also, the router itself, and in this configuration, the powerline adapter can/are likely further reducing the speed.

    Try moving everything to the same room and test. ie: David > short ethernet > router > short ethernet > Goliath

    That will give you the best possible results with your current hardware (assuming there aren't any configuration issues).
     
  3. BigTobster

    BigTobster Thread Starter

    Joined:
    Feb 26, 2011
    Messages:
    173
    Thanks for the response.

    I did as you suggested and then worked backwards.

    The powerline adapter was knocking about 20% throughput off the connection. On a straight through was getting only a few MB/s from the routers theoretical maximum :D

    On Wireless, the connection was getting battered. Over halved by moving up stairs. Not exactly surprising but still interesting.

    A fun exercise is to use wget on a big file and then run around the house with your laptop and watch what happens :)

    Working backwards I then ironed out a few issues. Mostly, my issues concerned me misreading MB/s and Mbps :)
    Human failure. The most common and troublesome computer fault!

    Interesting to know about the NIC stuff. Thanks for that.

    I'm solved :)
     
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