Has the 11.2 RC2 kernel stolen a CPU?

hcvv · #1 (**permalink**) 29-Oct-2009, 14:31

On openSUSE 10.3 using cat /proc/cpuinfo I get::

Code:

processor       : 0
vendor_id       : GenuineIntel
cpu family      : 6
model           : 15
model name      : Genuine Intel(R) CPU            2140  @ 1.60GHz
stepping        : 2
cpu MHz         : 1600.000
cache size      : 1024 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     : 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 pbe nx lm constant_tsc pni monitor ds_cpl est tm2 ssse3 cx16 xtpr lahf_lm
bogomips        : 3203.51
clflush size    : 64

processor       : 1
vendor_id       : GenuineIntel
cpu family      : 6
model           : 15
model name      : Genuine Intel(R) CPU            2140  @ 1.60GHz
stepping        : 2
cpu MHz         : 1600.000
cache size      : 1024 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     : 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 pbe nx lm constant_tsc pni monitor ds_cpl est tm2 ssse3 cx16 xtpr lahf_lm
bogomips        : 3200.93
clflush size    : 64

and on 11.2 RC2:

Code:

processor       : 0
vendor_id       : GenuineIntel
cpu family      : 6
model           : 15
model name      : Genuine Intel(R) CPU            2140  @ 1.60GHz
stepping        : 2
cpu MHz         : 1200.000
cache size      : 1024 KB
physical id     : 0
siblings        : 1
core id         : 0
cpu cores       : 1
apicid          : 0
initial apicid  : 0
fdiv_bug        : no
hlt_bug         : no
f00f_bug        : no
coma_bug        : no
fpu             : yes
fpu_exception   : yes
cpuid level     : 10
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx lm constant_tsc arch_perfmon pebs bts pni dtes64 monitor ds_cpl est tm2 ssse3 cx16 xtpr pdcm lahf_lm
bogomips        : 3200.95
clflush size    : 64
power management:

And this is of course mirrored in places like My Computer.

Is the 11.2 kernel not seeing (and worse: not using) my hyperthreading or is there some other explanation?

Knurpht · #2 (**permalink**) 30-Oct-2009, 04:00

Henk, mine shows everything normal, on both systems. If it's all over the place, could it be a degrading condition of the CPU?

Akoellh · #3 (**permalink**) 30-Oct-2009, 04:04

Fact is:

All openSUSE kernels since 10.2 have SMP activated by default, the last version still having an extra "kernel-smp" was 10.1.

hcvv · #4 (**permalink**) 30-Oct-2009, 04:28

@Knurpht
I do not think something being wrong in the hardware. I am now constanly rebooting between 10.3 and 11.2 and both are very consistent in what they say: two on 10.3 and one on 11.2.

@Akoellh
Kernel in my 10.3: 2.6.22.19-0.4-default.
Kernel in my 11.2 RC2: 2.6.31.5-0.1-desktop.
All rather normal I think. I originaly installed 11.2 RC1 from DVD and went to RC2 with zypper dup. This would give me the correct kernel would it?

Akoellh · #5 (**permalink**) 30-Oct-2009, 07:30

Code:

zgrep SMP /proc/config.gz

hcvv · #6 (**permalink**) 30-Oct-2009, 07:59

Same system running 10.3:

Code:

CONFIG_SMP=y
# CONFIG_X86_BIGSMP is not set
CONFIG_SUSPEND_SMP=y
CONFIG_X86_FIND_SMP_CONFIG=y
CONFIG_X86_SMP=y

and 11.2

Code:

CONFIG_USE_GENERIC_SMP_HELPERS=y
CONFIG_X86_32_SMP=y
CONFIG_SMP=y
CONFIG_X86_BIGSMP=y
CONFIG_PM_SLEEP_SMP=y
CONFIG_SCSI_SAS_HOST_SMP=y
CONFIG_VIDEO_VP27SMPX=m

Thanks for looking into this.

Akoellh · #7 (**permalink**) 30-Oct-2009, 09:14

Just installed "kernel-desktop" on my 11.2 test installation (i586, x86_64 is still updating to rc2) and it shows me both CPUs.

Although "only" a VM, the cpus are "passed through", so my result is accurate and as expected.

The kernel itself is certainly not the problem.

P.S.

A simple "uname -a" will also confirm SMP support.

lwfinger · #8 (**permalink**) 30-Oct-2009, 10:15

Please post the output of 'dmesg | grep CPU'.

hcvv · #9 (**permalink**) 30-Oct-2009, 10:59

All below when running under 11.2.

uname -a:

Code:

Linux boven 2.6.31.5-0.1-desktop #1 SMP PREEMPT 2009-10-26 15:49:03 +0100 i686 i686 i386 GNU/Linux

dsmesg | grep CPU:

Code:

[    0.000000]   Transmeta TransmetaCPU
[    0.000000] Processor #0 (Bootup-CPU)
[    0.000000] SMP: Allowing 2 CPUs, 0 hotplug CPUs
[    0.000000] NR_CPUS:128 nr_cpumask_bits:128 nr_cpu_ids:2 nr_node_ids:8
[    0.000000] PERCPU: Embedded 14 pages at c1a25000, static data 34204 bytes
[    0.000000] Initializing CPU#0
[    0.032061] CPU: L1 I cache: 32K, L1 D cache: 32K
[    0.032065] CPU: L2 cache: 1024K
[    0.032069] CPU: Physical Processor ID: 0
[    0.032071] CPU: Processor Core ID: 0
[    0.032076] mce: CPU supports 6 MCE banks
[    0.032087] CPU0: Thermal monitoring enabled (TM2)
[    0.052039] Brought up 1 CPUs
[    0.052089] CPU0 attaching NULL sched-domain.
[    0.500998] Switched to high resolution mode on CPU 0
[    1.455278] processor LNXCPU:00: registered as cooling_device0
[   19.243956] powernow: This module only works with AMD K7 CPUs
[   55.014525] CPU0 attaching NULL sched-domain.
[   55.014601] CPU0 attaching NULL sched-domain.

hcvv · #10 (**permalink**) 30-Oct-2009, 11:12

And below when under10.3

uname -a

Code:

Linux boven 2.6.22.19-0.4-default #1 SMP 2009-08-14 02:09:16 +0200 i686 i686 i386 GNU/Linux

dmesg | grep CPU

Code:

Initializing CPU#0
CPU: After generic identify, caps: bfebfbff 20100000 00000000 00000000 0000e39d 00000000 00000001
CPU: L1 I cache: 32K, L1 D cache: 32K
CPU: L2 cache: 1024K
CPU: Physical Processor ID: 0
CPU: Processor Core ID: 0
CPU: After all inits, caps: bfebfbff 20100000 00000000 00003940 0000e39d 00000000 00000001
Intel machine check reporting enabled on CPU#0.
CPU0: Intel Genuine Intel(R) CPU            2140  @ 1.60GHz stepping 02
Initializing CPU#1
CPU: After generic identify, caps: bfebfbff 20100000 00000000 00000000 0000e39d 00000000 00000001
CPU: L1 I cache: 32K, L1 D cache: 32K
CPU: L2 cache: 1024K
CPU: Physical Processor ID: 0
CPU: Processor Core ID: 1
CPU: After all inits, caps: bfebfbff 20100000 00000000 00003940 0000e39d 00000000 00000001
Intel machine check reporting enabled on CPU#1.
CPU1: Intel Genuine Intel(R) CPU            2140  @ 1.60GHz stepping 02
checking TSC synchronization [CPU#0 -> CPU#1]: passed.
Brought up 2 CPUs
Switched to NOHz mode on CPU #0
Switched to NOHz mode on CPU #1
powernow: This module only works with AMD K7 CPUs

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