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Date: Tue, 6 Sep 2011 15:42:28 -0700
From: Andi Kleen <ak@linux.intel.com>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: Andi Kleen <andi@firstfloor.org>, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 1/3] clockevents: Use an atomic RCU notifier for
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> The idle code, at least the one in drivers/idle/intel_idle.c, does
> _NOT_ call into that code at all when a reliable lapic timer is
> available:

But the ACPI idle doesn't check that, so it still has a scalability problem.

Hmm ok so could add that check into acpi idle too I guess, but then ACPI
idle doesn't normally know anything about CPUs.

> Either you are using different code or your machine does not have that
> ARAT flag set.

The second test was using ACPI idle.

-Andi