linux-kernel - Re: [BUG] cpufreq: constant cpu

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Date:	Mon, 25 Aug 2008 13:35:06 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	linux-kernel <linux-kernel@...r.kernel.org>
Cc:	cpufreq@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	davej <davej@...emonkey.org.uk>
Subject: Re: [BUG] cpufreq: constant cpu_khz

On Mon, 2008-08-25 at 08:33 +0200, Peter Zijlstra wrote:
> Hi,
> 
> 
> I noticed that my sched_clock() was slow on a number of machine, so I
> started looking at cpufreq.

The below seems to fix the problem for me, but I don't have enough clue
to know if its the correct fix, please advise.

diff --git a/arch/x86/kernel/tsc.c b/arch/x86/kernel/tsc.c
index 46af716..2f10f8c 100644
--- a/arch/x86/kernel/tsc.c
+++ b/arch/x86/kernel/tsc.c
@@ -314,7 +319,7 @@ static int time_cpufreq_notifier(struct
notifier_block *nb, unsigned long val,
 			mark_tsc_unstable("cpufreq changes");
 	}
 
-	set_cyc2ns_scale(tsc_khz_ref, freq->cpu);
+	set_cyc2ns_scale(tsc_khz, freq->cpu);
 
 	return 0;
 }


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