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Network/internet/tcp problem

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  • Network/internet/tcp problem

    I have a really weird problem on my work machine.

    on our 20mbit adsl download link I get only 8mbit in tcp but full with UDP?!?

    I have changed the nic, plugged directly into the dsl modem, changed the modem and I'm thinking about reinstalling

    freaking weird is that I get 30mbit to and from the server on our local net ?!?
    If there's artificial intelligence, there's bound to be some artificial stupidity.

    Jeremy Clarkson "806 brake horsepower..and that on that limp wrist faerie liquid the Americans call petrol, if you run it on the more explosive jungle juice we have in Europe you'd be getting 850 brake horsepower..."

  • #2
    Service provider throttling/shaping certain traffic based on packet type?

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    • #3
      Its in my machine

      the other computers get full speed.

      And I suspect the OS since it didnt help to change nic

      also tried with another cable..
      If there's artificial intelligence, there's bound to be some artificial stupidity.

      Jeremy Clarkson "806 brake horsepower..and that on that limp wrist faerie liquid the Americans call petrol, if you run it on the more explosive jungle juice we have in Europe you'd be getting 850 brake horsepower..."

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      • #4
        What OS?
        “Inside every sane person there’s a madman struggling to get out”
        –The Light Fantastic, Terry Pratchett

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        • #5
          Windows xp pro sp2
          If there's artificial intelligence, there's bound to be some artificial stupidity.

          Jeremy Clarkson "806 brake horsepower..and that on that limp wrist faerie liquid the Americans call petrol, if you run it on the more explosive jungle juice we have in Europe you'd be getting 850 brake horsepower..."

          Comment


          • #6
            TCP has extra overhead plus it can issue retries. This can cause some slowdown. UDP is connectionless and doesn't care if the data makes it to the other side. It just blasts everything out.

            Here is a quick explanation:

            TCP (Transmission Control Protocol) is the most commonly used protocol on the Internet. The reason for this is because TCP offers error correction. When the TCP protocol is used there is a "guaranteed delivery." This is due largely in part to a method called "flow control." Flow control determines when data needs to be re-sent, and stops the flow of data until previous packets are successfully transferred. This works because if a packet of data is sent, a collision may occur. When this happens, the client re-requests the packet from the server until the whole packet is complete and is identical to its original.

            UDP (User Datagram Protocol) is anther commonly used protocol on the Internet. However, UDP is never used to send important data such as webpages, database information, etc; UDP is commonly used for streaming audio and video. Streaming media such as Windows Media audio files (.WMA) , Real Player (.RM), and others use UDP because it offers speed! The reason UDP is faster than TCP is because there is no form of flow control or error correction. The data sent over the Internet is affected by collisions, and errors will be present. Remember that UDP is only concerned with speed. This is the main reason why streaming media is not high quality.
            Ladies and gentlemen, take my advice, pull down your pants and slide on the ice.

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            • #7
              Yes I know the difference between tcp and udp.

              The test software I'm using tests both tcp and udp.

              the workstation a foot to the right of mine get 98% tcp speed of the udp.

              As I wrote in my earlier posts I have tried that workstations cable, an other nic, tried different Adsl modem, router, cables, etcetera because we first fought it was a network problem since the whole network was slow.

              changing the nic's in the router (smoothwall box) fixed the problem for every computer in the house except mine, that is seemingly dropping every other tcp packet.

              On monday I'm going to plug my workstations hdd into the other one, If that works my new mobo is going to get RMA'd (the onboard vga is wonky, i wouldn't be surprised to know that the nic is wonky to), next step is a reinstall of the OS.
              If there's artificial intelligence, there's bound to be some artificial stupidity.

              Jeremy Clarkson "806 brake horsepower..and that on that limp wrist faerie liquid the Americans call petrol, if you run it on the more explosive jungle juice we have in Europe you'd be getting 850 brake horsepower..."

              Comment


              • #8
                Check the bios settings for the bus? I've seen write combining or delay transaction cause problems with certain NICs.

                Comment


                • #9
                  Good one!
                  You could also check the buffer settings for the NIC. I've seen terrible tcp performance on cheapo nic that lacked adequate buffer (long time ago - was the reason then to get decent branded nics).

                  Jörg
                  pixar
                  Dream as if you'll live forever. Live as if you'll die tomorrow. (James Dean)

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                  • #10
                    It was software

                    Clean install, 17,70mbit tcp 18,80 udp
                    If there's artificial intelligence, there's bound to be some artificial stupidity.

                    Jeremy Clarkson "806 brake horsepower..and that on that limp wrist faerie liquid the Americans call petrol, if you run it on the more explosive jungle juice we have in Europe you'd be getting 850 brake horsepower..."

                    Comment


                    • #11
                      Which software? Do you mean Windows?


                      Jörg
                      pixar
                      Dream as if you'll live forever. Live as if you'll die tomorrow. (James Dean)

                      Comment


                      • #12
                        Probably

                        But to be more exact, the problem was caused by some software (OS, driver, app, etcetera).
                        If there's artificial intelligence, there's bound to be some artificial stupidity.

                        Jeremy Clarkson "806 brake horsepower..and that on that limp wrist faerie liquid the Americans call petrol, if you run it on the more explosive jungle juice we have in Europe you'd be getting 850 brake horsepower..."

                        Comment


                        • #13
                          Bet you if you'd reset the TCP stack that would have fixed it.
                          Chief Lemon Buyer no more Linux sucks but not as much
                          Weather nut and sad git.

                          My Weather Page

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                          • #14
                            If I have time tomorrow I can always check that (ghost is your friend).

                            But I was on the third motherboard since the last reinstall on that machine and it had other "issues" that while not being showstoppers was beggining to annoy me
                            If there's artificial intelligence, there's bound to be some artificial stupidity.

                            Jeremy Clarkson "806 brake horsepower..and that on that limp wrist faerie liquid the Americans call petrol, if you run it on the more explosive jungle juice we have in Europe you'd be getting 850 brake horsepower..."

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