Re: [Bugme-new] [Bug 8811] New: us3_cpufreq not working on blade

Re: [Bugme-new] [Bug 8811] New: us3_cpufreq not working on blade

[Andrew Morton]

On Wed, 25 Jul 2007 14:27:00 -0700 (PDT)
bugme-daemon@bugzilla.kernel.org wrote:

> http://bugzilla.kernel.org/show_bug.cgi?idˆ11
> 
>            Summary: us3_cpufreq not working on blade 2000 with 2xUltraSPARC
>                     IIIcu 900MHz
>            Product: Platform Specific/Hardware
>            Version: 2.5
>      KernelVersion: 2.6.22.1
>           Platform: All
>         OS/Version: Linux
>               Tree: Mainline
>             Status: NEW
>           Severity: normal
>           Priority: P1
>          Component: SPARC64
>         AssignedTo: platform_sparc64@kernel-bugs.osdl.org
>         ReportedBy: vallesroc@gmail.com
> 
> 
> Most recent kernel where this bug did not occur: -
> Distribution: Gentoo/Linux
> Hardware Environment: Sun Blade 2000, 2xUltraSPARC IIIcu 900MHz 8mb cache, 4GB
> RAM
> Software Environment: cpufrequtils-002 from
> http://www.kernel.org/pub/linux/utils/kernel/cpufreq/cpufrequtils.html,
> installed from gentoo ebuild.
> 
> Problem Description:
> cpufreq-info reports frequency ranges just fine, and after setting the governor
> to "powersave" will report current cpufreq as the minimum one, yet the cpu
> frequency is definitivelly not lowered, because it'll take the same time to do
> an mplayer -noaudio -benchmark movie.avi
> 
> Steps to reproduce:
> 1. Load the us3_cpufreq kernel module
> 2. Set the governor to powersave
> 

Re: [Bugme-new] [Bug 8811] New: us3_cpufreq not working on blade

[David Miller]

From: Andrew Morton <akpm@linux-foundation.org>
Date: Wed, 25 Jul 2007 16:14:40 -0700

> > Steps to reproduce:
> > 1. Load the us3_cpufreq kernel module
> > 2. Set the governor to powersave

What does the kernel print in the logs during these attempted
cpufreq changes with the following debugging patch applied?

diff --git a/arch/sparc64/kernel/us3_cpufreq.c b/arch/sparc64/kernel/us3_cpufreq.c
index 47e3aca..521d865 100644
--- a/arch/sparc64/kernel/us3_cpufreq.c
+++ b/arch/sparc64/kernel/us3_cpufreq.c
@@ -141,6 +141,10 @@ static void us3_set_cpu_divider_index(unsigned int cpu, unsigned int index)
 	cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
 
 	set_cpus_allowed(current, cpus_allowed);
+#if 1
+	printk(KERN_ERR "US3: Wrote %lx (index %x) to SAFARI_CFG on cpu %u\n",
+	       reg, index, cpu);
+#endif
 }
 
 static int us3_freq_target(struct cpufreq_policy *policy,