From: Knut Petersen <Knut_Petersen@t-online.de>
To: Linus Torvalds <torvalds@osdl.org>
Cc: Dave Jones <davej@redhat.com>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Andrew Morton <akpm@osdl.org>
Subject: Re: [BUG] wrong bogomips values with kernel 2.6.16
Date: Wed, 22 Mar 2006 18:35:46 +0100 [thread overview]
Message-ID: <44218AF2.90003@t-online.de> (raw)
In-Reply-To: <Pine.LNX.4.64.0603220717270.26286@g5.osdl.org>
Linus Torvalds wrote:
>On Wed, 22 Mar 2006, Knut Petersen wrote:
>
>
>>All Pentium M, Xeon up to model 2 and the P6 family increment with every
>>internal processor cycle.
>>
>>
>
>Just to humor me. Try the bogomips loop in user space with something like
>the appended (make sure the frequency is fixed to the lowest frequency).
>
> Linus
>
>
No problem ...
linux:~ # cat
/sys/devices/system/cpu/cpu0/cpufreq/scaling_available_frequencies
1867000 1600000 1333000 1067000 800000
linux:~ # echo 800000 >
/sys/devices/system/cpu/cpu0/cpufreq/scaling_setspeed;cat
/proc/cpuinfo;./test
processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 13
model name : Intel(R) Pentium(R) M processor 1.86GHz
stepping : 8
cpu MHz : 800.000
cache size : 2048 KB
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 2
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge
mca cmov pat clflush dts acpi mmx fxsr sse sse2 ss tmpbe nx est tm2
bogomips : 3730.27
TSC: 798.307872 MHz
linux:~ # echo 1067000 >
/sys/devices/system/cpu/cpu0/cpufreq/scaling_setspeed;cat
/proc/cpuinfo;./test
processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 13
model name : Intel(R) Pentium(R) M processor 1.86GHz
stepping : 8
cpu MHz : 1067.000
cache size : 2048 KB
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 2
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge
mca cmov pat clflush dts acpi mmx fxsr sse sse2 ss tmpbe nx est tm2
bogomips : 4975.25
TSC: 1064.407897 MHz
linux:~ # echo 1333000 >
/sys/devices/system/cpu/cpu0/cpufreq/scaling_setspeed;cat
/proc/cpuinfo;./test
processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 13
model name : Intel(R) Pentium(R) M processor 1.86GHz
stepping : 8
cpu MHz : 1333.000
cache size : 2048 KB
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 2
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge
mca cmov pat clflush dts acpi mmx fxsr sse sse2 ss tmpbe nx est tm2
bogomips : 6215.57
TSC: 1330.511688 MHz
linux:~ # echo 1600000 >
/sys/devices/system/cpu/cpu0/cpufreq/scaling_setspeed;cat
/proc/cpuinfo;./test
processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 13
model name : Intel(R) Pentium(R) M processor 1.86GHz
stepping : 8
cpu MHz : 1600.000
cache size : 2048 KB
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 2
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge
mca cmov pat clflush dts acpi mmx fxsr sse sse2 ss tmpbe nx est tm2
bogomips : 7460.55
TSC: 1596.612533 MHz
linux:~ # echo 1867000 >
/sys/devices/system/cpu/cpu0/cpufreq/scaling_setspeed;cat
/proc/cpuinfo;./test
processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 13
model name : Intel(R) Pentium(R) M processor 1.86GHz
stepping : 8
cpu MHz : 1867.000
cache size : 2048 KB
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 2
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge
mca cmov pat clflush dts acpi mmx fxsr sse sse2 ss tmpbe nx est tm2
bogomips : 8705.53
TSC: 1862.715048 MHz
I tried kernel _2.6.15_ too - it´s even more broken:
linux:~ # cat /proc/cpuinfo;./test
processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 13
model name : Intel(R) Pentium(R) M processor 1.86GHz
stepping : 8
cpu MHz : 4347.853
cache size : 2048 KB
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 2
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge
mca cmov pat clflush dts acpi mmx fxsr sse sse2 ss tmpbe nx est tm2
bogomips : 8702.35
TSC: 1863.086854 MHz
Isn´t that nice? I´m able to overclock my 1.86 MHz cpu to stable 4.35 MHz
with just a passive heatsink ;-)))
cu,
Knut
prev parent reply other threads:[~2006-03-22 17:44 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-03-21 13:10 [BUG] wrong bogomips values with kernel 2.6.16 Knut Petersen
2006-03-21 18:10 ` Linus Torvalds
2006-03-22 5:19 ` Knut Petersen
2006-03-22 15:30 ` Linus Torvalds
2006-03-22 17:35 ` Knut Petersen [this message]
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