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Date: Wed, 18 Apr 2007 12:15:31 +0200 From: "Stefan Prechtel" <stefan.prechtel@...glemail.com> To: "Mircea Bardac" <dev.list@...cea.bardac.net> Cc: linux-kernel@...r.kernel.org, "Rusty Russell" <rusty@...tycorp.com.au>, "Srivatsa Vaddagiri" <vatsa@...ibm.com>, "Zwane Mwaikambo" <zwane@....linux.org.uk>, "Ashok Raj" <ashok.raj@...el.com> Subject: Re: CPU off-on-off: lost CPU management? Hello, I have the same "problems" with CPU-Hotplug. Whenever I turn off the second core and turn it back on, /proc/cpuinfo shows that the second core is on, but at a different speed. # cat /proc/cpuinfo processor : 0 vendor_id : AuthenticAMD cpu family : 15 model : 72 model name : AMD Turion(tm) 64 X2 Mobile Technology TL-60 stepping : 2 cpu MHz : 800.000 cache size : 512 KB physical id : 0 siblings : 1 core id : 0 cpu cores : 1 fdiv_bug : no hlt_bug : no f00f_bug : no coma_bug : no fpu : yes fpu_exception : yes cpuid level : 1 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt rdtscp lm 3dnowext 3dnow pni cx16 lahf_lm cmp_legacy svm extapic cr8legacy ts fid vid ttp tm stc bogomips : 1596.96 clflush size : 64 processor : 1 vendor_id : AuthenticAMD cpu family : 15 model : 72 model name : AMD Turion(tm) 64 X2 Mobile Technology TL-60 stepping : 2 cpu MHz : 1995.071 fdiv_bug : no hlt_bug : no f00f_bug : no coma_bug : no fpu : yes fpu_exception : yes cpuid level : 1 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt rdtscp lm 3dnowext 3dnow pni cx16 lahf_lm cmp_legacy svm extapic cr8legacy ts fid vid ttp tm stc bogomips : 3990.71 clflush size : 64 dmesg shows the following after resume from s2disk (only the first time, then "CPU: Vendor unknown../Your system my be unstable" doesn't appear): Disabling non-boot CPUs ... Cannot set affinity for irq 0 CPU 1 is now offline SMP alternatives: switching to UP code CPU1 is down Intel machine check architecture supported. Intel machine check reporting enabled on CPU#0. Enabling non-boot CPUs ... SMP alternatives: switching to SMP code Booting processor 1/1 eip 3000 Initializing CPU#1 Calibrating delay using timer specific routine.. 3990.61 BogoMIPS (lpj=1995306) CPU: Vendor unknown, using generic init. CPU: Your system may be unstable. CPU: After generic identify, caps: 178bfbff ebd3fbff 00000000 00000000 00002001 00000000 0000001f CPU: After all inits, caps: 178bfbff ebd3fbff 00000000 00000000 00002001 00000000 0000001f CPU1: AuthenticAMD AMD Turion(tm) 64 X2 Mobile Technology TL-60 stepping 02 CPU1 is up Switched to high resolution mode on CPU 1 But I don't noticed a shorter batterylife or more cpu hotness, so I think the second core is running at the same speed as CPU0 and /proc/cpuinfo (and possibly other files) doesn't update correctly. Regards, Stefan 2007/4/8, Mircea Bardac <dev.list@...cea.bardac.net>: > Hi everyone, > > After reading "CPU offline but power consumption increased?" lkml thread I > wanted to test CPU on-off on my Turion 64 X2. > > I found out something strange, related to the way CPU is turned off and back > on. I don't know if this is a kernel bug, but looks pretty suspicious. > > > **** The initial situation, both cores running at 1.6 GHz, full info displayed > **** /proc/cpuinfo > > # cat /proc/cpuinfo > processor : 0 > vendor_id : AuthenticAMD > cpu family : 15 > model : 72 > model name : AMD Turion(tm) 64 X2 Mobile Technology TL-52 > stepping : 2 > cpu MHz : 1600.000 > cache size : 512 KB > physical id : 0 > siblings : 2 > core id : 0 > cpu cores : 2 > fdiv_bug : no > hlt_bug : no > f00f_bug : no > coma_bug : no > fpu : yes > fpu_exception : yes > cpuid level : 1 > wp : yes > flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca > cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt lm > 3dnowext 3dnow pni cx16 lahf_lm cmp_legacy svm cr8legacy ts fid vid ttp tm > stc > bogomips : 3195.47 > clflush size : 64 > > processor : 1 > vendor_id : AuthenticAMD > cpu family : 15 > model : 72 > model name : AMD Turion(tm) 64 X2 Mobile Technology TL-52 > stepping : 2 > cpu MHz : 1600.000 > cache size : 512 KB > physical id : 0 > siblings : 2 > core id : 1 > cpu cores : 2 > fdiv_bug : no > hlt_bug : no > f00f_bug : no > coma_bug : no > fpu : yes > fpu_exception : yes > cpuid level : 1 > wp : yes > flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca > cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt lm > 3dnowext 3dnow pni cx16 lahf_lm cmp_legacy svm cr8legacy ts fid vid ttp tm > stc > bogomips : 3195.47 > clflush size : 64 > > > > **** The initial situation, both cores running at 1.6 GHz, full info displayed > **** cpufreq-info > > # cpufreq-info > cpufrequtils 002: cpufreq-info (C) Dominik Brodowski 2004-2006 > Report errors and bugs to linux@...do.de, please. > analyzing CPU 0: > driver: powernow-k8 > CPUs which need to switch frequency at the same time: 0 1 > hardware limits: 800 MHz - 1.60 GHz > available frequency steps: 1.60 GHz, 800 MHz > available cpufreq governors: powersave, performance > current policy: frequency should be within 800 MHz and 1.60 GHz. > The governor "performance" may decide which speed to use > within this range. > current CPU frequency is 1.60 GHz (asserted by call to hardware). > analyzing CPU 1: > driver: powernow-k8 > CPUs which need to switch frequency at the same time: 0 1 > hardware limits: 800 MHz - 1.60 GHz > available frequency steps: 1.60 GHz, 800 MHz > available cpufreq governors: powersave, performance > current policy: frequency should be within 800 MHz and 1.60 GHz. > The governor "performance" may decide which speed to use > within this range. > current CPU frequency is 1.60 GHz (asserted by call to hardware). > > > > **** 2nd core is shut down > > # echo 0 > /sys/devices/system/cpu/cpu1/online > > > > **** Only 2nd core is now running, at 800 MHz, half bogomips > **** /proc/cpuinfo > > # cat /proc/cpuinfo > processor : 0 > vendor_id : AuthenticAMD > cpu family : 15 > model : 72 > model name : AMD Turion(tm) 64 X2 Mobile Technology TL-52 > stepping : 2 > cpu MHz : 800.000 > cache size : 512 KB > physical id : 0 > siblings : 1 > core id : 0 > cpu cores : 1 > fdiv_bug : no > hlt_bug : no > f00f_bug : no > coma_bug : no > fpu : yes > fpu_exception : yes > cpuid level : 1 > wp : yes > flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca > cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt lm > 3dnowext 3dnow up pni cx16 lahf_lm cmp_legacy svm cr8legacy ts fid vid ttp tm > stc > bogomips : 1597.73 > clflush size : 64 > > > > **** Only 2nd core is now running, at 800 MHz, half bogomips > **** cpufreq-info > > # cpufreq-info > cpufrequtils 002: cpufreq-info (C) Dominik Brodowski 2004-2006 > Report errors and bugs to linux@...do.de, please. > analyzing CPU 0: > driver: powernow-k8 > CPUs which need to switch frequency at the same time: 0 > hardware limits: 800 MHz - 1.60 GHz > available frequency steps: 1.60 GHz, 800 MHz > available cpufreq governors: powersave, performance > current policy: frequency should be within 800 MHz and 1.60 GHz. > The governor "performance" may decide which speed to use > within this range. > current CPU frequency is 800 MHz (asserted by call to hardware). > > > > **** Turning 2nd core back on > > # echo 1 > /sys/devices/system/cpu/cpu1/online > > > > **** /proc/cpuinfo shows again info about 2nd core > **** but some details are missing about 2nd core, such as "cache size" > **** (others might also be missing) - this makes me think something might not > **** be working right (cache not used maybe?) > **** Bogomips is still half (I'm not sure if this is directly proportional > **** with CPU frequency or with number of cores) > > # cat /proc/cpuinfo > processor : 0 > vendor_id : AuthenticAMD > cpu family : 15 > model : 72 > model name : AMD Turion(tm) 64 X2 Mobile Technology TL-52 > stepping : 2 > cpu MHz : 800.000 > cache size : 512 KB > physical id : 0 > siblings : 1 > core id : 0 > cpu cores : 1 > fdiv_bug : no > hlt_bug : no > f00f_bug : no > coma_bug : no > fpu : yes > fpu_exception : yes > cpuid level : 1 > wp : yes > flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca > cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt lm > 3dnowext 3dnow pni cx16 lahf_lm cmp_legacy svm cr8legacy ts fid vid ttp tm > stc > bogomips : 1597.73 > clflush size : 64 > > processor : 1 > vendor_id : AuthenticAMD > cpu family : 15 > model : 72 > model name : AMD Turion(tm) 64 X2 Mobile Technology TL-52 > stepping : 2 > cpu MHz : 1596.093 > fdiv_bug : no > hlt_bug : no > f00f_bug : no > coma_bug : no > fpu : yes > fpu_exception : yes > cpuid level : 1 > wp : yes > flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca > cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt lm > 3dnowext 3dnow pni cx16 lahf_lm cmp_legacy svm cr8legacy ts fid vid ttp tm > stc > bogomips : 1596.01 > clflush size : 64 > > > **** cpufreq-info shows info only about 1st core > > # cpufreq-info > cpufrequtils 002: cpufreq-info (C) Dominik Brodowski 2004-2006 > Report errors and bugs to linux@...do.de, please. > analyzing CPU 0: > driver: powernow-k8 > CPUs which need to switch frequency at the same time: 0 > hardware limits: 800 MHz - 1.60 GHz > available frequency steps: 1.60 GHz, 800 MHz > available cpufreq governors: powersave, performance > current policy: frequency should be within 800 MHz and 1.60 GHz. > The governor "performance" may decide which speed to use > within this range. > current CPU frequency is 800 MHz (asserted by call to hardware). > analyzing CPU 1: > no or unknown cpufreq driver is active on this CPU > > > > **** reloading powernow-k8 driver, to check if cpufreq-info gets back working > > # rmmod powernow-k8 > > # modprobe powernow-k8 > FATAL: Error inserting powernow_k8 > (/lib/modules/2.6.20-ARCH/kernel/arch/i386/kernel/cpu/cpufreq/powernow-k8.ko): > No such device > > > Many thanks, > Mircea > > -- > http://mircea.bardac.net > - > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@...r.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/ > - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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