Re: [PATCH] serial: 8250, increase PASS_LIMIT

[Alan Cox]

On Sun,  5 Jun 2011 22:51:49 +0200
Jiri Slaby <jslaby@xxxxxxx> wrote:

> From: Jiri Slaby <jirislaby@xxxxxxxxx>
> 
> With virtual machines like qemu, it's pretty common to see "too much
> work for irq4" messages nowadays. This happens when a bunch of output
> is printed on the emulated serial console. This is caused by too low
> PASS_LIMIT. When ISR loops more than the limit, it spits the message.
> 
> I've been using a kernel with doubled the limit and I couldn't see no
> problems. Maybe it's time to get rid of the message now?

We need a limit to deal with hangs caused by misconfiguration /
mis-detection on ISA ports in particular but we can certainly bump the
limit to handle poor emulations.
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