linux-kernel - Re: [PATCH] X86: Suppress hundreds of Intel thermal MCE messages on high temps

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Date:	Fri, 23 Oct 2009 10:01:53 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Thomas Renninger <trenn@...e.de>
Cc:	linux-tip-commits@...r.kernel.org, linux-kernel@...r.kernel.org,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: Re: [PATCH] X86: Suppress hundreds of Intel thermal MCE messages
	on high temps


* Thomas Renninger <trenn@...e.de> wrote:

> This is against 2.6.31, but it should still patch, tell me if not. 
> Should this also go to stable@...nel.org?
> 
> Thanks,
> 
>        Thomas
> 
> ---------
> This (introduced by Ingo some time ago):
>    if (!(was_throttled ^ is_throttled) &&
>         time_before64(tmp_jiffs, __get_cpu_var(next_check)))
> does not help much.
> The interrupts happening and the read out MSR seem to tell that
> the CPU gets throttled and unthrottled all the time.
> Thus current implementation results in hundreds (thousands?) of "above threshold"
> messages per minute.
> 
> This patch is more or less a revert back to the implementation in
> older kernels.
> The message:
>     printk(KERN_INFO "CPU%d: Temperature/speed normal\n", cpu);
> is not needed as it is suppressed anyway.
> 
> Reference of an affected Core 2 and a Celeron machine:
> http://bugzilla.novell.com/show_bug.cgi?id=533556
> 
> Signed-off-by: Thomas Renninger <trenn@...e.de>

Have you seen these upstream commits:

 b417c9f: x86: mce: Fix thermal throttling message storm
 3967684: x86: mce: Clean up thermal throttling state tracking code

?

If they solve the problem for you then please forward them to 
stable@...nel.org.

Thanks,

	Ingo
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