linux-kernel - Re: latest -git: WARNING: at arch/x86/kernel/ipi.c:123 send_IPI_mask

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Date:	Mon, 25 Aug 2008 22:36:49 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Dave Jones <davej@...hat.com>, Andi Kleen <andi@...stfloor.org>,
	Vegard Nossum <vegard.nossum@...il.com>,
	"H. Peter Anvin" <hpa@...nel.org>,
	the arch/x86 maintainers <x86@...nel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Rusty Russell <rusty@...tcorp.com.au>
Subject: Re: latest -git: WARNING: at arch/x86/kernel/ipi.c:123 send_IPI_mask_bitmask+0xc3/0xe0()

> On some systems (for which there aren't BIOS updates) the trip points are
> set too low.  

There were patches floating to make this configurable. I was always
a little sceptical of them, but they exist.

> If we get a thermal event that was caused by temporary
> increased workload, temperature will drop off again when that workload
> is complete.

But none of the cpufreq governours do this. They only care about
load, not about temperature.

> For sustained workloads we'd get additional thermal events, at which
> time we make a decision "ok, we've throttled as far as we can, and
> things are still going badly, power off".

That is what the ACPI driver does when the trip point is reached.

> In the event of a failed fan or similar, shutting down is obviously
> the right thing to do, and we'd get further thermal events after
> throttling which would allow us to do so.

So you're saying processor_thermal should let the system cook
for some time first before really taking action?

-Andi
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