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Date: Mon, 6 Jun 2011 13:09:45 +0100
From: Alan Cox <alan@...ux.intel.com>
To: Jiri Slaby <jslaby@...e.cz>
Cc: gregkh@...e.de, jirislaby@...il.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] serial: 8250, increase PASS_LIMIT
On Sun, 5 Jun 2011 22:51:49 +0200
Jiri Slaby <jslaby@...e.cz> wrote:
> From: Jiri Slaby <jirislaby@...il.com>
>
> 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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