linux-kernel - Re: Unhandled IRQs on AMD E-450

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Message-ID: <4F9E61FC.8070409@ladisch.de>
Date:	Mon, 30 Apr 2012 11:57:16 +0200
From:	Clemens Ladisch <clemens@...isch.de>
To:	Jeroen Van den Keybus <jeroen.vandenkeybus@...il.com>
CC:	Josh Boyer <jwboyer@...il.com>,
	Borislav Petkov <borislav.petkov@....com>, andymatei@...il.com,
	"Huang, Shane" <Shane.Huang@....com>,
	Borislav Petkov <bp@...64.org>, linux-kernel@...r.kernel.org
Subject: Re: Unhandled IRQs on AMD E-450

Jeroen Van den Keybus wrote:
> - Detect stuck interrupts after a number (5) of consecutive unhandled
> IRQs within a specified time frame (100ms).

Why 5?  This threshold is likely to be too low; fast consecutive interrupts
can easily happen more often with a very busy device, while an actual stuck
interrupt will call the handler in an endless loop and very quickly result
in many thousands of calls.

> --- linux-3.2.16.orig/include/linux/irqdesc.h	2012-04-23
> 00:31:32.000000000 +0200

Your mailer wraps lines; see Documentation/email-clients.txt.


Regards,
Clemens
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