[opensuse] Problem with Dual 2 Core T7200
OK, someone from SUSE at the Linuxtag told me that both Cores on my T7200 can run at different frequencies, thats what i've read everywhere too! I have a Thinkpad Z61p with one of these CPUs. cpufre-info says: CPUs which need to switch frequency at the same time: 0 1 OK, what the hell is going on here, i've bought a laptop with an T7200 Dual Core CPU!? Is there another CPU installed? But "cat /proc/cpuinfo": processor : 0 vendor_id : GenuineIntel cpu family : 6 model : 15 model name : Intel(R) Core(TM)2 CPU T7200 @ 2.00GHz stepping : 6 cpu MHz : 1000.000 cache size : 4096 KB physical id : 0 siblings : 2 core id : 0 cpu cores : 2 fpu : yes fpu_exception : yes cpuid level : 10 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm syscall nx lm constant_tsc pni monitor ds_cpl vmx est tm2 cx16 xtpr lahf_lm bogomips : 3995.88 clflush size : 64 cache_alignment : 64 address sizes : 36 bits physical, 48 bits virtual power management: processor : 1 vendor_id : GenuineIntel cpu family : 6 model : 15 model name : Intel(R) Core(TM)2 CPU T7200 @ 2.00GHz stepping : 6 cpu MHz : 1000.000 cache size : 4096 KB physical id : 0 siblings : 2 core id : 1 cpu cores : 2 fpu : yes fpu_exception : yes cpuid level : 10 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm syscall nx lm constant_tsc pni monitor ds_cpl vmx est tm2 cx16 xtpr lahf_lm bogomips : 3990.12 clflush size : 64 cache_alignment : 64 address sizes : 36 bits physical, 48 bits virtual power management: -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org For additional commands, e-mail: opensuse+help@opensuse.org
On Saturday 02 June 2007 03:50, Frank Fiene wrote:
OK, someone from SUSE at the Linuxtag told me that both Cores on my T7200 can run at different frequencies, thats what i've read everywhere too! I have a Thinkpad Z61p with one of these CPUs.
cpufre-info says:
CPUs which need to switch frequency at the same time: 0 1
Perhaps the person who told you they CPUs could operate at different frequencies was mistaken?
OK, what the hell is going on here, i've bought a laptop with an T7200 Dual Core CPU!? Is there another CPU installed?
Programmatically, a dual-core CPU is very similar to two single-core CPUs. On recent Linux kernels, even a HyperThreading CPU looks like two separate CPUs at the user level.
But "cat /proc/cpuinfo":
... [ two virtually identical CPUs ] ...
Randall Schulz -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org For additional commands, e-mail: opensuse+help@opensuse.org
On Samstag, 2. Juni 2007, Randall R Schulz wrote:
On Saturday 02 June 2007 03:50, Frank Fiene wrote:
OK, someone from SUSE at the Linuxtag told me that both Cores on my T7200 can run at different frequencies, thats what i've read everywhere too! I have a Thinkpad Z61p with one of these CPUs.
cpufre-info says:
CPUs which need to switch frequency at the same time: 0 1
Perhaps the person who told you they CPUs could operate at different frequencies was mistaken?
Yes, perphaps you're right. I've read the spec pdf from Intel and it says both cores have independent MSRs for controlling Speedstep but both cores must operate at the same frequency. I remember something different from some newspaper but anyway. But this would be fine for power enhancements, right? Or turning off one core would also be nice for battery life?
OK, what the hell is going on here, i've bought a laptop with an T7200 Dual Core CPU!? Is there another CPU installed?
Programmatically, a dual-core CPU is very similar to two single-core CPUs. On recent Linux kernels, even a HyperThreading CPU looks like two separate CPUs at the user level.
Not for forking processes like in a Linux environment, HT is not very good on this issue. ;-) Thx. Frank -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org For additional commands, e-mail: opensuse+help@opensuse.org
On Saturday 02 June 2007 10:16, Frank Fiene wrote:
On Samstag, 2. Juni 2007, Randall R Schulz wrote:
...
Programmatically, a dual-core CPU is very similar to two single-core CPUs. On recent Linux kernels, even a HyperThreading CPU looks like two separate CPUs at the user level.
Not for forking processes like in a Linux environment, HT is not very good on this issue. ;-)
I'm not commenting on the performance characteristics of dual-CPU vs. dual-core vs. HT, just the fact that the Linux kernel papers over the differences, for the most part, merging them all under the SMP (symmetric multiprocessing) rubric.
Thx. Frank
Randall Schulz -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org For additional commands, e-mail: opensuse+help@opensuse.org
participants (2)
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Frank Fiene
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Randall R Schulz