Dotaz: 2x Core 2 Xeon - kolik polozek v /proc/cpuinfo

[Martin Beránek]

mam masinu na otestovani ($sub). jsou tam 2 procesory Core 2 Xeon (2 jadra a na kazdem HyperThreading).

ocekaval jsem tedy v /proc/cpuinf 8 polozek, ale jsou tam jenom 4, je to tak spravne?

Odpovědi

[diverman]

4

[Nikola Ciprich]

no tak to je fakt hodnotna odpoved :-/. proc 4?

z mych dosavadnich zkusenosti bych rekl ze by opravdu melo byt videt 8 polozek. takze dotaz na tazatele: mate HT opravdu zapnuty v biosu? pripadne jak vypada /proc/cmdline?

[pzad]

Core 2 nema HT.

[petr]

2 jádra * 2 procesory = 4 záznamy

[AloneInTheDark]

pastni sem prosim vypis z cat /proc/cpuinfo

jestli kernel detekoval vsechny cpu spravne a poznal ze jsou ht. take by me to zajimalo, nebot me podobne zelezo asi take brzy bude cekat - diky.

[brano]

ja ich mam 8; nezabudol si nahodou na polozku CONFIG_X86_HT=y ?

cat /proc/cpuinfo

processor       : 0
vendor_id       : GenuineIntel
cpu family      : 15
model           : 6
model name      :                   Intel(R) Xeon(TM) CPU 3.00GHz
stepping        : 4
cpu MHz         : 2992.632
cache size      : 2048 KB
physical id     : 0
siblings        : 4
core id         : 0
cpu cores       : 2
fpu             : yes
fpu_exception   : yes
cpuid level     : 6
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 cid cx16 xtpr lahf_lm
bogomips        : 5991.68
clflush size    : 64
cache_alignment : 128
address sizes   : 36 bits physical, 48 bits virtual
power management:

processor       : 1
vendor_id       : GenuineIntel
cpu family      : 15
model           : 6
model name      :                   Intel(R) Xeon(TM) CPU 3.00GHz
stepping        : 4
cpu MHz         : 2992.632
cache size      : 2048 KB
physical id     : 1
siblings        : 4
core id         : 0
cpu cores       : 2
fpu             : yes
fpu_exception   : yes
cpuid level     : 6
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 cid cx16 xtpr lahf_lm
bogomips        : 5985.30
clflush size    : 64
cache_alignment : 128
address sizes   : 36 bits physical, 48 bits virtual
power management:

processor       : 2
vendor_id       : GenuineIntel
cpu family      : 15
model           : 6
model name      :                   Intel(R) Xeon(TM) CPU 3.00GHz
stepping        : 4
cpu MHz         : 2992.632
cache size      : 2048 KB
physical id     : 0
siblings        : 4
core id         : 1
cpu cores       : 2
fpu             : yes
fpu_exception   : yes
cpuid level     : 6
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 cid cx16 xtpr lahf_lm
bogomips        : 5985.27
clflush size    : 64
cache_alignment : 128
address sizes   : 36 bits physical, 48 bits virtual
power management:

processor       : 3
vendor_id       : GenuineIntel
cpu family      : 15
model           : 6
model name      :                   Intel(R) Xeon(TM) CPU 3.00GHz
stepping        : 4
cpu MHz         : 2992.632
cache size      : 2048 KB
physical id     : 1
siblings        : 4
core id         : 1
cpu cores       : 2
fpu             : yes
fpu_exception   : yes
cpuid level     : 6
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 cid cx16 xtpr lahf_lm
bogomips        : 5985.17
clflush size    : 64
cache_alignment : 128
address sizes   : 36 bits physical, 48 bits virtual
power management:

processor       : 4
vendor_id       : GenuineIntel
cpu family      : 15
model           : 6
model name      :                   Intel(R) Xeon(TM) CPU 3.00GHz
stepping        : 4
cpu MHz         : 2992.632
cache size      : 2048 KB
physical id     : 0
siblings        : 4
core id         : 0
cpu cores       : 2
fpu             : yes
fpu_exception   : yes
cpuid level     : 6
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 cid cx16 xtpr lahf_lm
bogomips        : 5985.23
clflush size    : 64
cache_alignment : 128
address sizes   : 36 bits physical, 48 bits virtual
power management:

processor       : 5
vendor_id       : GenuineIntel
cpu family      : 15
model           : 6
model name      :                   Intel(R) Xeon(TM) CPU 3.00GHz
stepping        : 4
cpu MHz         : 2992.632
cache size      : 2048 KB
physical id     : 0
siblings        : 4
core id         : 1
cpu cores       : 2
fpu             : yes
fpu_exception   : yes
cpuid level     : 6
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 cid cx16 xtpr lahf_lm
bogomips        : 5985.20
clflush size    : 64
cache_alignment : 128
address sizes   : 36 bits physical, 48 bits virtual
power management:

processor       : 6
vendor_id       : GenuineIntel
cpu family      : 15
model           : 6
model name      :                   Intel(R) Xeon(TM) CPU 3.00GHz
stepping        : 4
cpu MHz         : 2992.632
cache size      : 2048 KB
physical id     : 1
siblings        : 4
core id         : 0
cpu cores       : 2
fpu             : yes
fpu_exception   : yes
cpuid level     : 6
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 cid cx16 xtpr lahf_lm
bogomips        : 5985.17
clflush size    : 64
cache_alignment : 128
address sizes   : 36 bits physical, 48 bits virtual
power management:

processor       : 7
vendor_id       : GenuineIntel
cpu family      : 15
model           : 6
model name      :                   Intel(R) Xeon(TM) CPU 3.00GHz
stepping        : 4
cpu MHz         : 2992.632
cache size      : 2048 KB
physical id     : 1
siblings        : 4
core id         : 1
cpu cores       : 2
fpu             : yes
fpu_exception   : yes
cpuid level     : 6
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 cid cx16 xtpr lahf_lm
bogomips        : 5984.75
clflush size    : 64
cache_alignment : 128
address sizes   : 36 bits physical, 48 bits virtual
power management:

[Martin Beránek]

cat /proc/cpuinfo
processor       : [0-3]
vendor_id       : GenuineIntel
cpu family      : 6
model           : 15
model name      : Genuine Intel(R) CPU                  @ 2.66GHz
stepping        : 4
cpu MHz         : 14169.864
cache size      : 4096 KB
physical id     : 0
siblings        : 1
core id         : 0
cpu cores       : 1
fpu             : yes
fpu_exception   : yes
cpuid level     : 10
wp              : yes
flags           : fpu tsc msr pae mce cx8 apic mtrr mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm syscall lm constant_tsc pni monitor ds_cpl vmx est tm2 cx16 xtpr lahf_lm
bogomips        : 28216.99
clflush size    : 64
cache_alignment : 64
address sizes   : 36 bits physical, 48 bits virtual
power management:

[Roman DAVID]

ma tam byt 8

[pzad]

Pokial je to xeon 50xx tak 8.
Pokial je to xeon 51xx tak 4.

[Dan Ohnesorg]

Hm, zrovna resim jaky Xeon mam koupit a tahle diskuze me zaujala, puvodne jsem si rikal, ze kdyz stoji 5060 stejne jako 5130, takze bude lepsi vzit 5130 ze min topi a je modernejsi a ma dve jadra misto jednoho jadra s HT. Ale ted mi to prijde, ze 5060 ma teda dve jadra s HT? Stroj bude uplne cisty mysql server, zadna jina aplikace na nem. Serverove sasi umi obe varianty, budou tam dva procesory.

Co byste poradili?

[Martin Beránek]

Tak je to 5150, takze by tam melo byt 8 "polozek". Az to doresim dam vedet. Ted je tam standardni jadro z RHEL 4.

[Martin Beránek]

teda pisu blbosti... takze maji byt 4 plozky - ok... co tedy ten procesor nema? HT, nebo DualCore?

[Marek Pasovsky]

nema HT

Marek

[AloneInTheDark]

Pokud je v /proc/cpuinfo v polozce flags uvedeno ht tak procesor podporuje hyperthreading. Tedy 2 cpu dualcore HT - 2 cpu kazde s dvema jadry a kazde jadro diky ht vystupujici jako dve - celkem tedy 8 polozek.

Z manualu ktery mam od Dellu :

Processor Terminology Socket: a physical package containing a processor with one or more cores. Core: an individual processor within a socket. The new Intel processors can contain two cores per socket. Hyper-Threading Module: an individual software thread that simulates a unique processor for the task scheduler. The new Intel processors allow two threads per core.

Linux-based Operating Systems In general, the Linux kernel can support up to 32 processors on the Intel x86 architecture, and is aware of multiple cores and Hyper-Threading. For example, with a Linux kernel running on a system with two dual-core processors, each with Hyper-Threading, the processors will be presented as follows in /proc/cpuinfo:

CPU ID 0: Socket 1, Core 1, HT Module 1;
CPU ID 1: Socket 1, Core 1, HT Module 2;
CPU ID 2: Socket 1, Core 2, HT Module 1;
CPU ID 3: Socket 1, Core 2, HT Module 2;
CPU ID 4: Socket 2, Core 1, HT Module 1;
CPU ID 5: Socket 2, Core 1, HT Module 2;
CPU ID 6: Socket 2, Core 2, HT Module 1;
CPU ID 7: Socket 2, Core 2, HT Module 2;

This behavior, however, varies across Linux distributions depending upon the support provided in the kernel by the vendor.

Novell/SUSE Linux SUSE Linux Enterprise Server 9 is based on the 2.6.5 kernel, but will support up to 32 processors for both the x86 and x86_64 architectures with Service Pack 2 and above. Licenses are provided per CPU socket.

Red Hat Red Hat® Enterprise Linux 3 x86 provides support for up to 16 processors, and Red Hat Enterprise Linux 4 x86 provides support for up to 32 processors; however, both Red Hat Enterprise Linux 3 and 4 x86_64 only provide support for up to 8 processors. Licensing is provided per CPU socket.

[pzad]

Yes, but also the 'siblings' field is relevant.
It's possible to have a ht CPU with no siblings. (Ie, only shows up
as single CPU)

[pzad]

Dave Jones

[AloneInTheDark]

Sibling (cesky sourozenec ) je, pokud si dobre pamatuju, "Logicke CPU na tom samem fyzickem jadre" . Tedy pocet o kterem mluvi polozka siblings, je u daneho jadra pocet jeho HT subjader. Tento termin byl zaveden proto, protoze kdyz scheduler ( planovac ) jadra potrebuje prevezt kontext procesu na jiny procesor, prevadi ho prioritne na sveho vlastniho sourozence ( tedy druhe HT jadro na tom samem fyzickem CPU ) a to prototoze je to efektivnejsi - usetri se rezije s nahravanim dat do cache CPU. Pri prevedeni da jine fyzicke CPU se musi obsah cache zahodit.

Takze pokud je siblings = 0 a zaroven procesor HT podporuje tak bych se domnival, ze HT neni v jadre aktivovano. Kernel musi byt kompilovan jako SMP , v poctu procesoru musi byt odpovidajici cislo, musi byt povoleno a funkcni acpi ( jak v biosu desky tak v "linuxu" ) a HT nesmi byt pochopitelne vypnute v biosu. Atd.

Bohuzel s nejnovejsimi CPU doposud nemam prakticke zkusenosti, takze jak by rekl Madr - Pravda je nekde venku ...

[Martin Beránek]

Pokud je v /proc/cpuinfo v polozce flags uvedeno ht tak procesor podporuje hyperthreading.

rekl bych ze to neni pravda - empericky: mam Core Duo, ktery podle specifikace HT nema, ale ve flags ht mam...

zacinam v tom mit totalni zmatek (a to sem si myslel ze to mu jakz takz rozumim). zadne oficialni specifikace nemuzu poradne najit.

[AloneInTheDark]

Core Duo a Core Duo 2 jsou DualCore procesory - maji dve jadra v jednom fyzickem CPU. Kazde jedno z techto jader uz dal nepodporuje Hyper Threading.( nevim tedy proc definuji flag ht - jsem taky ztracen )

Core Duo Xeon ... jsou serverovy cpu, ktery umeji DualCore a zaroven HT. ftp://download.intel.com/products/processor/xeon/dc5kplatbrief.pdf

Proc pouze stanicovy CPU ( Core Duo a Core Duo 2 maji definovany ht flag netusim - mam v tom evidentne taky zmatek ).

Jen tak pro zajimavost - jak vypada vypis /proc/cpuinfo z Core Duo ? Diky za kazde info.

Porovnani vlastnosti jednotlivych Intel CPU

[diverman]

processor       : 0
vendor_id       : GenuineIntel
cpu family      : 6
model           : 14
model name      : Genuine Intel(R) CPU           T2300  @ 1.66GHz
stepping        : 8
cpu MHz         : 1667.000
cache size      : 2048 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 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx constant_tsc pni monitor est tm2 xtpr
bogomips        : 3328.23

processor       : 1
vendor_id       : GenuineIntel
cpu family      : 6
model           : 14
model name      : Genuine Intel(R) CPU           T2300  @ 1.66GHz
stepping        : 8
cpu MHz         : 1667.000
cache size      : 2048 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 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx constant_tsc pni monitor est tm2 xtpr
bogomips        : 3325.05

[-nd-]

mate nekdo odkaz na tyhle zkratky co znamenaji?? kdysi sem to hledal a nenasel sem nic relevantniho

takovy ty zkratky sse apod clovek jeste snad chape ale treba fxsr, cx8 a dalsi mne rozhodne nic nerikaji

[pzad]

ht flag znamena len tolko, ze tam hyper threading moze byt, ale nie, ze tam aj je.

[Martin Beránek]

podle tohoto pdf z FI ma HT a Dualcore napriklad Petntium Extreme Edition

[Martin Beránek]

a podle teto tabulky se jich da najit jeste par u xeonu

takze uz v tom zrejme jasno

diky vsem