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    SubjectRe: [PATCH] #2 VIA Rhine stalls: TxAbort handling
    On Thu, 16 May 2002, 'Roger Luethi' wrote:

    > On Thu, 16 May 2002 18:03:25 +0800, Shing Chuang wrote:
    > > As following three error conditions occurred, the VT6102 & VT86C100A
    > > chip are designed to shutdown TX for driver to examine the error frame.
    > >
    > > 1. Tx fifo underrun.
    > >
    > > 2. Tx Abort (Too many collisions occurred).
    > >
    > > 3. TxDescriptors status write back error. (Only on VT6102 chip)
    > Hey, thanks! That's exactly the piece of information I've been looking for.
    > > All the three conditions caused the TXON bit of CR1 went off. the
    > > driver must wait a little while until the bit go off, reset the pointer of
    > > [...]
    > > do {} while (BYTE_REG_BITS_IS_ON(CR0_TXON,&pMacRegs->byCR0));
    > The driver "waits a little" in the interrupt handler? How long can that
    > take, worst case?


    > I don't know of many places where the kernel stops to
    > wait for an external device to change some value.

    Yep... should never wait inside an ISR, to say nothing about
    the potential wait-forever.

    Even if the chip never breaks, you end up with reports like..
    "Strange, I make frisbees when buring CDs while M$ machines do
    backups over the network..."

    Or, I can't play ".wav" files anymore unless I unplug from the

    Stuff has to play together. Sometimes this means you can't get
    the maximum-theoretical-possible through-put from your connected

    The worse-case driver is where the programmer decided to turn
    interrupts back on in the ISR.... to let higher-priority interrupts
    occur... FYI, there are always higher-priority interrupts that
    will take the CPU away... you lose big-time.

    Dick Johnson

    Penguin : Linux version 2.4.18 on an i686 machine (797.90 BogoMips).

    Windows-2000/Professional isn't.

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