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Author Topic: IRQ sharing???  (Read 1562 times)

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vaporbrother

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IRQ sharing???
« on: 11-November-03, 05:22:45 »

Hi guys!!!!!  just want to ask about IRQ sharing.... i've noticed that my VGA and USB are sharing the same IRQ. Is that normal?

Thanks Again Much!!!!!! :lol_anim:
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Richard

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« Reply #1 on: 11-November-03, 06:01:21 »
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  • vaporbrother,

    The Geforce4 Ti Series and the GeforceFX Series do not like to share IRQs Period.

    Try disabling the USB Controller if you start having problems.

    Take Care,

    Richard
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    Richard J. Gentil, Pres.
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    vaporbrother

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    « Reply #2 on: 11-November-03, 06:03:54 »

    thanks a lot aqain DEATHSTALKER !!!!!!!!!
    But i don't have any problems experiencing right now,  but if i do i will try your advice ..... But is this normal to have one IRQ shared?
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    conio

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    « Reply #3 on: 11-November-03, 07:36:51 »
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  • IRQ sharing is a normal process as the system can use the IO port range to identify the actual device that requested the IRQ.
    It is only the IO port and memory range that can`t be shared among devices.
    Usualy IRQ sharing is employed between devices that are conected toghether(video and AGP port) or between devices that are on the same bus(two boards on the PCI bus).
    Having IRQ`s shared does have a degrading effect on performance as the system must query all devices that sare a IRQ in order to determine with one has requested it witch means a lot of overhead compared to a no IRQ sharing scenario.
    As such having a fast video card sharing it`s IRQ will lead to a small performance drop and posibly some stability issues with some hardware drivers.
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    vaporbrother

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    « Reply #4 on: 11-November-03, 08:20:34 »

    thanks!!!! But how about my IRQ 16 is being shared by VGA and USB? Is that a conflict or affecting the performance of my VGA ? Thus also disabling my USBs will help like Deathstalker is saying?
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    conio

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    « Reply #5 on: 12-November-03, 07:39:48 »
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  • As long as you don`t see any exclamation icons on any of the devices there is no conflict but if you do not use the USB you should disable it as it simply eats up resources.
    Also because the USB is a asynchronous device the performance of the video should be only very sligthy affected as the video trafic will take precedence over the USB.
    So the best solution is either to disable the USB or, if and only if you use it,  to see if you can change the IRQ assignment from the computer BIOS.
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    vaporbrother

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    « Reply #6 on: 14-November-03, 02:10:32 »

    conio my man thanks a lot!!! but how can i change the IRQs ?
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