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PC to PC straight through performance 1000 full duplex

Discussion in 'Networks' started by moonoiuk, Jun 2, 2009.

  1. moonoiuk

    moonoiuk New Member

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    Hi there,
    a subject that i have never understood or asked but bugs me everytime i come across it. Can someone help?

    If i have two machine connected with a straight through cable (ie. no switch hub router) and both NIC's are set to 1000 full duplex...

    1/ why if i pull the file is it faster than sending/ pushing to the other machine?
    2/ if capability is supposed to be 1000Mb why does utilisation never seem to go over an average of say 70%.

    Assumptions, there is nothing wrong with the cable and it is only a short run of say 5 meters.

    Many thanks,
    Moonoi
     
  2. Fergal1982

    Fergal1982 Petabyte Poster

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    Why dont you head over to New Members, and introduce yourself. Its always nice to treat the members of the forum as a community, rather than just an encyclopedia.

    Im sure that you will get more detailed responses, but consider this:

    You own a bugatti veyron. Top speed of 255mph, but it doesnt operate at 255mph continuously does it? Thats just tha 'maximum' utilisation that it can operate at.

    More of an IT slant: if the connection operates at 100%, additional communications cannot take place. If your download consumes all 100%, then you will be unable to cancel the download, or continue browsing the other files on the computer until the download completes.
     
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  3. r.h.lee

    r.h.lee Gigabyte Poster

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    moonoiuk,

    Are you sure the two machines are connected with a straight through cable and not a crossover cable?

     
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  4. Qs

    Qs Semi-Honorary Member Gold Member

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    This! :p

    Qs
     
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  5. ThomasMc

    ThomasMc Gigabyte Poster

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    Doesn't most devices come with auto MDI/MDIX these days
     
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  6. Qs

    Qs Semi-Honorary Member Gold Member

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    You can't assume that the PCs have auto MDI/MDIX.

    Do you know what assume does?

    It makes an ass out of u and me. :p
     
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  7. ThomasMc

    ThomasMc Gigabyte Poster

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    Lmao, ok duely noted.
     
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  8. r.h.lee

    r.h.lee Gigabyte Poster

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    ThomasMc,

    Since the situation mentions PC to PC, do you know of any NICs out there that come with Auto-MDIX technology?

    Source:
    1. HP Auto-MDIX technology - http://www.hp.com/hpinfo/abouthp/iplicensing/automdix.html
     
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  9. ThomasMc

    ThomasMc Gigabyte Poster

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    No but if its not how is he managing to send files?

    Tx -> Tx
    Rx -> Rx

    = No connection, does it not
     
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  10. r.h.lee

    r.h.lee Gigabyte Poster

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    ThomasMc,

    So you'd rather assume that Auto-MDIX NICs are being used with the "...two machine connected with a straight through cable (ie. no switch hub router)..." in order to make file transfer possible than questioning if an appropriate cable was used?
     
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  11. ThomasMc

    ThomasMc Gigabyte Poster

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    Not at all, What I'm trying to understand is, if hes not using a crossover or one of the nics haven't got Auto MDI/MDIX then how can he transfer files, this is for my benefit as well as the OP
     
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  12. Bluerinse
    Honorary Member

    Bluerinse Exabyte Poster

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    As it is working, i would assume (yah i know, im an ass) the OP *is* using a crossover cable. Otherwise, it wouldnt work.. either way it doesnt address the question :)
     
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  13. moonoiuk

    moonoiuk New Member

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    That was an ass thing, i was supposed to write cross over! :-) although as most of you have mentioned most NICs can detected this and get on with it.....

    Likewise this does not answer the question.... :-)

    The cable is Crossover, and still the same thing applies, why slow one way and not the other, and why not more than say 60% taken up of all jobs that are going on not just the file copy, why would the whole bandwidth not be utilised.:eek:
     
  14. Qs

    Qs Semi-Honorary Member Gold Member

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    Bad cable? Try another. Crossover is annoying to say the least.

    Double check the NIC cards on both PCs. If the problem is only when sending data to a particular computer then check that card/PC first. Make sure it's not being restricted.

    Qs
     
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