Re: All kernels after 2.6.32-git10 show only 1 CPU

From: Sid Boyce
Date: Fri Dec 25 2009 - 13:33:39 EST

On 25/12/09 07:38, Yinghai Lu wrote:
> On Wed, Dec 23, 2009 at 8:55 AM, Sid Boyce <sboyce@xxxxxxxxxxxxxxxx> wrote:
>> On the 4P box, 2.6.32-git10 boots and shows 4 CPU's, 2.6.32-git12 boots
>> and shows 1 CPU, 2.6.32-git15 to 2.6.33-rc1-git3 1 CPU and lots of oops,
>> continues with something like "Sending NMI interrupts to CPU's",
>> [udev] unexpectedly returned with status 0x0100
>> [udev] failed while handling /devices/pci000:00 -----etc--- same for
>> other devices.
>> Unable to capture via serial console as USB doesn't come ready.
>>
>> On 2P laptop, up to 2.6.33-rc1 boots, 1 CPU and boot option "acpi=noirq"
>> needed, without it boot hangs, I think from 2.6.32-git15.
>> Building kernels, I have used the .config from previous kernel and
>> "make oldconfig".
>>
>> # uname -r
>> 2.6.32-git12-smp
>> slipstream:~ # cat /proc/cpuinfo
>> processor : 0
>> vendor_id : AuthenticAMD
>> cpu family : 16
>> model : 4
>> model name : AMD Phenom(tm) II X4 940 Processor
>> stepping : 2
>> cpu MHz : 3013.597
>> cache size : 512 KB
>> physical id : 0
>> siblings : 1
>> core id : 0
>> cpu cores : 1
>> apicid : 0
>> initial apicid : 0
>> fpu : yes
>> fpu_exception : yes
>> cpuid level : 5
>> wp : yes
>> flags : fpu vme de pse tsc msr pae mce cx8 sep mtrr pge mca
>> cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt
>> pdpe1gb rdtscp lm 3dnowext 3dnow constant_tsc up rep_good nonstop_tsc
>> pni monitor cx16 popcnt lahf_lm cmp_legacy svm extapic cr8_legacy abm
>> sse4a misalignsse 3dnowprefetch osvw ibs skinit wdt
>> bogomips : 6027.18
>> TLB size : 1024 4K pages
>> clflush size : 64
>> cache_alignment : 64
>> address sizes : 48 bits physical, 48 bits virtual
>> power management: ts ttp tm stc 100mhzsteps hwpstate
>>
>> # uname -r
>> 2.6.32-git10-smp
>>
>> # cat /proc/cpuinfo
>> processor : 0
>> vendor_id : AuthenticAMD
>> cpu family : 16
>> model : 4
>> model name : AMD Phenom(tm) II X4 940 Processor
>> stepping : 2
>> cpu MHz : 3013.774
>> cache size : 512 KB
>> physical id : 0
>> siblings : 4
>> core id : 0
>> cpu cores : 4
>> apicid : 0
>> initial apicid : 0
>> fpu : yes
>> fpu_exception : yes
>> cpuid level : 5
>> 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 pdpe1gb rdtscp lm 3dnowext 3dnow constant_tsc rep_good
>> nonstop_tsc extd_apicid pni monitor cx16 popcnt lahf_lm cmp_legacy svm
>> extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw ibs skinit wdt
>> bogomips : 6027.53
>> TLB size : 1024 4K pages
>> clflush size : 64
>> cache_alignment : 64
>> address sizes : 48 bits physical, 48 bits virtual
>> power management: ts ttp tm stc 100mhzsteps hwpstate
>>
>> processor : 1
>> vendor_id : AuthenticAMD
>> cpu family : 16
>> model : 4
>> model name : AMD Phenom(tm) II X4 940 Processor
>> stepping : 2
>> cpu MHz : 3013.774
>> cache size : 512 KB
>> physical id : 0
>> siblings : 4
>> core id : 1
>> cpu cores : 4
>> apicid : 1
>> initial apicid : 1
>> fpu : yes
>> fpu_exception : yes
>> cpuid level : 5
>> 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 pdpe1gb rdtscp lm 3dnowext 3dnow constant_tsc rep_good
>> nonstop_tsc extd_apicid pni monitor cx16 popcnt lahf_lm cmp_legacy svm
>> extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw ibs skinit wdt
>> bogomips : 6027.27
>> TLB size : 1024 4K pages
>> clflush size : 64
>> cache_alignment : 64
>> address sizes : 48 bits physical, 48 bits virtual
>> power management: ts ttp tm stc 100mhzsteps hwpstate
>>
>> etc., up to processor 4.
>>
>> On a 2P laptop
>> ===============
>> tindog:~ # uname -r
>> 2.6.33-rc1-smp
>>
>> tindog:~ # cat /proc/cpuinfo
>> processor : 0
>> vendor_id : AuthenticAMD
>> cpu family : 15
>> model : 67
>> model name : AMD Athlon(tm) 64 X2 Dual Core Processor 6000+
>> stepping : 3
>> cpu MHz : 1000.000
>> cache size : 1024 KB
>> physical id : 0
>> siblings : 1
>> core id : 0
>> cpu cores : 1
>> apicid : 0
>> initial apicid : 0
>> fpu : yes
>> fpu_exception : yes
>> cpuid level : 1
>> wp : yes
>> flags : fpu vme de pse tsc msr pae mce cx8 sep mtrr pge mca
>> cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt
>> rdtscp lm 3dnowext 3dnow up rep_good pni cx16 lahf_lm cmp_legacy svm
>> extapic cr8_legacy
>> bogomips : 2009.33
>> TLB size : 1024 4K pages
>> clflush size : 64
>> cache_alignment : 64
>> address sizes : 40 bits physical, 48 bits virtual
>> power management: ts fid vid ttp tm stc
>>
>> The .config for the 4P and 2.6.33-rc1-git3 attached.
>
> Can you disable MAXSMP?
>
> YH
>
>
tindog:/usr/src/linux-2.6.33-rc2 # grep MAXSMP .config
# CONFIG_MAXSMP is not set

tindog:/usr/src/linux-2.6.33-rc2 # grep NUMA .config
# CONFIG_NUMA is not set
tindog:/usr/src/linux-2.6.33-rc2 # grep NUMA
/usr/src/linux-2.6.33-rc1-git2/.config
CONFIG_NUMA=y
CONFIG_K8_NUMA=y
CONFIG_X86_64_ACPI_NUMA=y
CONFIG_NUMA_EMU=y
CONFIG_ACPI_NUMA=y
tindog:/usr/src/linux-2.6.33-rc2 #
tindog:/usr/src # grep NUMA linux-2.6.33-rc2/.config
CONFIG_NUMA=y
CONFIG_K8_NUMA=y
CONFIG_X86_64_ACPI_NUMA=y
# CONFIG_NUMA_EMU is not set
CONFIG_ACPI_NUMA=y
The above is the 2P box showing just 1 CPU.
Booting from an install DVD into rescue or booting the openSUSE kernel
2.6.32-3-default I have 2 CPU's.
-----------------------------------------------------------------------
Below is the 4P box which shows 4 CPU's.
slipstream:/usr/src/linux-2.6.33-rc2 # grep MAXSMP .config
# CONFIG_MAXSMP is not set

slipstream:/usr/src/linux-2.6.33-rc2 # grep NUMA .config
CONFIG_NUMA=y
CONFIG_K8_NUMA=y
CONFIG_X86_64_ACPI_NUMA=y
# CONFIG_NUMA_EMU is not set
CONFIG_ACPI_NUMA=y
slipstream:/usr/src/linux-2.6.33-rc2 #

I decided to use the config from the openSUSE kernel as the basis of a
new .config and 2.6.33-rc2 now shows 2 CPU's. Later I shall do a diff to
see if anything stands out.
tindog:~ # uname -r
2.6.33-rc2-smp
tindog:~ # cat /proc/cpuinfo
processor : 0
vendor_id : AuthenticAMD
cpu family : 15
model : 67
model name : AMD Athlon(tm) 64 X2 Dual Core Processor 6000+
stepping : 3
cpu MHz : 1000.000
cache size : 1024 KB
physical id : 0
siblings : 2
core id : 0
cpu cores : 2
apicid : 0
initial apicid : 0
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 rep_good extd_apicid pni cx16 lahf_lm
cmp_legacy svm extapic cr8_legacy
bogomips : 2009.06
TLB size : 1024 4K pages
clflush size : 64
cache_alignment : 64
address sizes : 40 bits physical, 48 bits virtual
power management: ts fid vid ttp tm stc

processor : 1
vendor_id : AuthenticAMD
cpu family : 15
model : 67
model name : AMD Athlon(tm) 64 X2 Dual Core Processor 6000+
stepping : 3
cpu MHz : 1000.000
cache size : 1024 KB
physical id : 0
siblings : 2
core id : 1
cpu cores : 2
apicid : 1
initial apicid : 1
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 rep_good extd_apicid pni cx16 lahf_lm
cmp_legacy svm extapic cr8_legacy
bogomips : 2009.06
TLB size : 1024 4K pages
clflush size : 64
cache_alignment : 64
address sizes : 40 bits physical, 48 bits virtual
power management: ts fid vid ttp tm stc
tindog:/usr/src/linux-2.6.33-rc2 # grep MAXSMP .config
# CONFIG_MAXSMP is not set
tindog:/usr/src/linux-2.6.33-rc2 # grep NUMA .config
CONFIG_NUMA_IRQ_DESC=y <<====== One difference.
CONFIG_NUMA=y
CONFIG_K8_NUMA=y
CONFIG_X86_64_ACPI_NUMA=y
CONFIG_NUMA_EMU=y
CONFIG_ACPI_NUMA=y

Regards
Sid.
--
Sid Boyce ... Hamradio License G3VBV, Licensed Private Pilot
Emeritus IBM/Amdahl Mainframes and Sun/Fujitsu Servers Tech Support
Specialist, Cricket Coach
Microsoft Windows Free Zone - Linux used for all Computing Tasks

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