Rob Landley wrote:
When running a 2.6.24 kernel built for x86-64 under qemu via serial console,
doing CPU-intensive things that also produce a lot of output (such as
compiling software) tends to produce the error message in the title.
Anybody have a clue why? It doesn't seem to cause an actual problem, but it's
kind of annoying.
(If it's a qemu issue, I can go bother them. It's possible that qemu isn't
delivering interrupts as often as it expects, since that's limited by the
granularity of the host timer; I know the clock in qemu can run a bit slow
because it only gets clock interrupts when the host system isn't too busy to
schedule the emulator. But this doesn't usually cause a problem. I _think_
the message is just a "this should never happen" type warning, which is
happening to me. But I break stuff. :)
This is because Qemu spews data to the serial port without any rate
limiting; this causes the in-kernel serial port driver to think the port
is stuck. The serial port emulation needs to make it possible to drain
the virtual FIFO every now and then, as opposed to filling it again
immediately.
-hpa
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