Slow boot with USB hub connected + 100% CPU on one core.

Discussion in 'Computer Information' started by R. Giggs., May 21, 2011.

  1. R. Giggs.

    R. Giggs. Guest

    What I seem to have found is that it boots fine with one device in the hub.
    Also there seems to be a bad port or two on the compuer
    as neither device worked connected directly to the computer.
    I have always had problem with some of the ports.
    However the hub ports all work fine, but that has always been connected
    to the same usb port.
    Bit of a confusing picture. That is made worse by the fact it can be rather

    I prefere not using the computer port because the hub ones seem to work
    better and also I would rather damage or cause wear to theports on the hub
    the computer.

    Indeed I had a TV a while back with 5 port on it and they seemed to
    'wear out' ie the picture quality deterioated afer several insertions.

    Whilst trying to fix the problem I manager to break the TV which was
    just as well as it was underwarrenty, so I got my money back,
    and banned from the store in the process!!! ( for swearing at a guy
    who wanted to give me a gift voucher instead of my money back), I got a new
    TV from very same store as well, so so much for the ban.

    So I wonder if the ports could be worn or dirty?
    R. Giggs., May 23, 2011
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  2. R. Giggs.

    Paul Guest

    Based on the general design of the USB connector, I'd say it is
    designed for a high cycle count. Where a USB can sometimes foul
    up, is if the metal parts get "torqued" by a user pulling at
    an angle, instead of straight out. Since the metal parts may have
    a seam, you could pull the metal apart and make the connector loose.

    On USB flash sticks, the weak point seems to be where the USB connector
    is soldered to the PCB. You don't find very many designs with good strain
    relief, so the stress is all concentrated at one point, and that's where
    it can snap.

    But the connector design itself seems to be pretty good. It should have
    the same qualities as ESATA, which also uses metal for structural parts.

    OK, I found a manufacturer data sheet for one of their USB jacks
    and it was rated for 1500 cycles (insertion/removal). Whereas
    ESATA is rated for 5000. The internal SATA connector in your
    computer is rated for 50 cycles. The external interfaces
    generally have a higher rating than internal ones.


    Based on some of your ports being broken, I'd say you were
    definitely in the market for a PCI USB2 card.

    Here is a card for $12.

    "Cons: 4+1 is inaccurate and misleading. It is more accurately described
    as "3+1 split". The internal port is just a tap off one of the external
    ports. Only one of the split ports can be used at any given time. But
    then again, all of the 4+1 PCI to USB cards seem to work this way."

    That means, a 4+1 card is just a four port card. I can't find a user manual,
    so it's hard to guess which external connector shares electrical lines
    with the internal connector. It may be obvious by looking at the signal
    routing on the card itself. This is only a concern, if you insist on using
    the internal connector. I would expect the four externals to work as long
    as you aren't using the internal one.

    On the Koutech site, the chip brand is NEC. It's too hard to see in the Newegg picture.
    NEC Electronics merged with Renesys, so at some point the logo on the chip may
    be changed. The NEC chip is noted for good compatibility (the original
    Microsoft provided USB2 driver, was tested with their chip). On the
    other hand, the ports are susceptible to ESD, so if you have bad
    static zap habits (scuff over carpet and somehow touch D+, D- pins
    inside the connector), the ports blow out. If the faceplate of the
    card is grounded to the chassis, that tends to deflect some of that
    kind of energy (it goes into the ground shield instead).

    Paul, May 23, 2011
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  3. R. Giggs.

    R. Giggs. Guest

    Thanks for that,1500 cycles is really not that high, especially when as is
    the case with me, you have had problematic devices which meant several
    reinsertions a day on a fairly frequent basis. (the USB TV stick I had had
    a dodgy/broken connection to the TV aerial.
    So I should try and find which ports work properly, however that is a bit
    difficult when it is inconsistant.

    Also I noted on the TV I had that the USB connections were part of a small
    circuit board which probably got stressed..

    I am in the UK by the way but I can get this one from a local store

    for £12 which is about $18

    However I can also get one from Ebay from about £2!!
    Note one listed there is a staggering £98!!!

    They are a neater solution than my USB hub which dangles from a short lead.
    Here it is:- caPSDTXNNw==

    There are plenty of even cheaper ones on ebay, but if you go to cheap you
    wonder about quality.

    So I have some options there, but not really a clear diagnosis of the

    However I am in no great rush to sort it out as it is a pretty minor issue,
    but I will still look into it and try and get a better idea as to what is
    going on.

    I think I will use the UBS TV dongle to see which port work best, I think I
    can hot plug that. I would use the webcam but that seems to
    require rebots.
    R. Giggs., May 23, 2011
  4. R. Giggs.

    R. Giggs. Guest

    For reference, something about an interupt storm here, seems similar.]
    R. Giggs., May 23, 2011
  5. Not so fast, Grasshopper...

    I thought the problem was with re-awakening after the machine went to sleep.
    If so, then you have to let the maching boot normally, start an app, or two,
    walk away for a while and come back.
    Jeff Strickland, May 24, 2011

  6. Okay, something to consider is that the USB draw on voltage is high with the
    devices connected. USB specification is for 5vdc, but I forget the power
    (watts, or amps) that is supplied. If you added a non-powered hub, then
    populated it with devices, then the power draw can exceed the supply, the
    result will be a slow boot experience.

    They make USB hubs that have their own external power supply, this might
    solve your problem. If you machine boots properly with no devices connected
    to the hub, then this points to the power demands exceeding the supply -- a
    powered hub should solve this issue. A new power supply for the machine can
    solve this problem too... You have to know what the current power supply's
    specification is for the USB power, then be sure that the replacement power
    supply provides more power.

    You can connect one device and observe the response several times, then
    connect the OTHER device BY ITSELF and observe the response again. One of
    them might be okay, and the other is connected on demand. I suspect you have
    too many USB devices connected at once, and this indicates you need more
    power from the power supply, or that you need a powered hub that drives some
    of the devices so that the power supply is not called upon to drive
    Jeff Strickland, May 24, 2011
  7. R. Giggs.

    R. Giggs. Guest

    No other way round, putting the machine to sleep and then waking it
    again woudl *cure* the 100% cpu on one core problem.

    Any how I noticed recently that the problem seem to have disappeared!!
    I have not made any changes.
    Maybe a virus fixed it. I noticed I hd more stuff running at startup,
    some adobe stuff (which I installed) and some 'pixelart' stuff from
    a screen rular, don't know why that is there as I have not touched it
    to my knowledge.

    I will let you know it it returns
    R. Giggs., May 29, 2011
  8. R. Giggs.

    R. Giggs. Guest

    Oh I just remembered oneother thing I changed, I switched from a USB
    internet connection to a ethernet one. Not sure if that coincided with the

    The usb internet connection never went via the hub rather straight from a PC
    USB port.

    Might have been that, could tally in with power consmption perhaps.
    R. Giggs., May 29, 2011
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