Intel Woodcrest Crash under heavy load with FC5 and MySql

[Albert Graham]

Hi Phil,

Phil Meyer wrote:
> Albert Graham wrote:
>> Hello all (especially the very technical),
>> ...
>>
>> The crashes ONLY happen if we enable all 4 Cores in the BIOS (Dual 
>> core = enabled)
>
> This makes me wonder.  Are you enabling dual core from the mother 
> board?  This is not a common option.  What is common is enabling and 
> disabling HT on the mother board.  With HT enabled and 2 dual core 
> CPUs you should see 8 CPUs in Linux.  (I don't know if the 5160 is HT 
> capable).
>
> Some motherboards don't like Hyper Threading with multiple CPUs.
>
> So my question is:  Is Hyper Threading turned off on the mother board?
>
As far as I can find out, these CPU's don't support HT at all!

However, you maybe on to something here because the "ht" flag is listed 
in cpiinfo, yet I have been told these cpus support ht.

Thanks phil, I'll investigate this with Supermicro tomorrow.

Albert.



processor       : 0
vendor_id       : GenuineIntel
cpu family      : 6
model           : 15
model name      : Intel(R) Xeon(R) CPU            5160  @ 3.00GHz
stepping        : 6
cpu MHz         : 3000.653
cache size      : 4096 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 mtrr pge mca 
cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe lm 
constant_tsc pni monitor ds_cpl vmx est tm2 cx16 xtpr lahf_lm
bogomips        : 6009.77

processor       : 1
vendor_id       : GenuineIntel
cpu family      : 6
model           : 15
model name      : Intel(R) Xeon(R) CPU            5160  @ 3.00GHz
stepping        : 6
cpu MHz         : 3000.653
cache size      : 4096 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 mtrr pge mca 
cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe lm 
constant_tsc pni monitor ds_cpl vmx est tm2 cx16 xtpr lahf_lm
bogomips        : 6000.65

processor       : 2
vendor_id       : GenuineIntel
cpu family      : 6
model           : 15
model name      : Intel(R) Xeon(R) CPU            5160  @ 3.00GHz
stepping        : 6
cpu MHz         : 3000.653
cache size      : 4096 KB
physical id     : 3
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 mtrr pge mca 
cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe lm 
constant_tsc pni monitor ds_cpl vmx est tm2 cx16 xtpr lahf_lm
bogomips        : 6000.70

processor       : 3
vendor_id       : GenuineIntel
cpu family      : 6
model           : 15
model name      : Intel(R) Xeon(R) CPU            5160  @ 3.00GHz
stepping        : 6
cpu MHz         : 3000.653
cache size      : 4096 KB
physical id     : 3
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 mtrr pge mca 
cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe lm 
constant_tsc pni monitor ds_cpl vmx est tm2 cx16 xtpr lahf_lm
bogomips        : 6000.73