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SubjectRe: 2.6.24 says "serial8250: too much work for irq4" a lot.
Rob Landley wrote:
>
> Specifically, qemu isn't paravirtualized, it's fully virtualized. The same
> kernel can run on real hardware just fine. (Sort of the point of the
> project...)
>
> I can yank the warning for the kernels I build (or set PASS_LIMIT to 9999999),
> but I'd rather not carry any more patches than I can avoid...
>

The right thing to do is to add virtual FIFO exhaustion into the Qemu
device model. It really isn't a valid emulation of a UART that it has
an infinite FIFO behind it that can flood the interrupt handler for an
arbitrary number of fetches.

I was going to give a technical description of how to do it here, but
then I realized I might as well just write it up as a patch. Stay tuned.

-hpa



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