Messages in this thread |  | | | Date | Thu, 07 Feb 2008 12:53:43 -0800 | | From | "H. Peter Anvin" <> | | Subject | Re: 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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