linux-kernel - Re: [PATCH] serial: 8250, increase PASS

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Date:	Mon, 06 Jun 2011 15:49:25 +0200
From:	Jiri Slaby <jslaby@...e.cz>
To:	Alan Cox <alan@...ux.intel.com>
CC:	gregkh@...e.de, jirislaby@...il.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] serial: 8250, increase PASS_LIMIT

On 06/06/2011 02:09 PM, Alan Cox wrote:
> 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.

Yeah, I meant it that way (get rid of the message by bumping the limit
-- this patch).

thanks,
-- 
js
suse labs
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