Re: [gentoo-user] Detecting 64 bit Intel chips
On Wednesday 05 March 2008 18:08:33 Neil Bothwick wrote: Run lshw and look at the width value for the CPU. I'd forgotten about lshw - thanks for the reminder. At the risk of a thread hijack, what should I do about this, which is shown for both CPU's: *-cache:2 DISABLED Does that mean the hardware feature is unavailable in these Opteron 246s, or that I've overlooked a kernel config parameter? I don't remember any motherboard jumpers for it. -- Rgds Peter -- gentoo-user@lists.gentoo.org mailing list
Re: [gentoo-user] Detecting 64 bit Intel chips
O/H Alan McKinnon έγραψε: Hi all, Sometime in the last month someone posted (in a thread that went wildly OT) a definite way to determine if an Intel cpu is 32 or 64 bit. Unfortunately I can't find the post anymore. It involved checking the cpu-family, model and flags fields in cpuinfo. Could that same kind soul please repost the info? And if possible the same for AMD? gentoo-wiki's article about safe cflags has the information you want... http://gentoo-wiki.com/Safe_Cflags for pentium4, the ones with the prescott core are 64bit... at /proc/cpuinfo you should see with a prescott: cpu_family:15 model : 3 or 4 you could also look for the pni cpuflag... -- Stratos Psomadakis [EMAIL PROTECTED] signature.asc Description: OpenPGP digital signature
Re: [gentoo-user] Detecting 64 bit Intel chips
Alan McKinnon wrote: Hi all, Sometime in the last month someone posted (in a thread that went wildly OT) a definite way to determine if an Intel cpu is 32 or 64 bit. Unfortunately I can't find the post anymore. It involved checking the cpu-family, model and flags fields in cpuinfo. Could that same kind soul please repost the info? And if possible the same for AMD? cat /proc/cpuinfo and look for lm, which stands for long mode, under the flags. I'm pretty sure that works for Intel and AMD. kashani -- gentoo-user@lists.gentoo.org mailing list
Re: [gentoo-user] Detecting 64 bit Intel chips
another way to test is to run a livecd in amd64 mode on new intel chips if it doesn't work, try the ia64 version if it doesn't work ... your intel is a 32 bits version :) Le Wednesday 05 March 2008 16:47:10 kashani, vous avez écrit : Alan McKinnon wrote: Hi all, Sometime in the last month someone posted (in a thread that went wildly OT) a definite way to determine if an Intel cpu is 32 or 64 bit. Unfortunately I can't find the post anymore. It involved checking the cpu-family, model and flags fields in cpuinfo. Could that same kind soul please repost the info? And if possible the same for AMD? cat /proc/cpuinfo and look for lm, which stands for long mode, under the flags. I'm pretty sure that works for Intel and AMD. kashani signature.asc Description: This is a digitally signed message part.
Re: [gentoo-user] Detecting 64 bit Intel chips
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Here is the output of my cpuinfo, I'll point out where it will mean 64bit. For the sake of this demonstration, I have only pasted one (1) CPU. [EMAIL PROTECTED] ~ $ cat /proc/cpuinfo processor : 0 vendor_id : AuthenticAMD cpu family : 15 model : 75 model name : AMD Athlon(tm) 64 X2 Dual Core Processor 4200+ -- Here will be your first indication. 64 bit processors, weather they are SPARC, AMD or intel, must identify themselves clearly in the model name field. stepping: 2 cpu MHz : 1000.000 -- forgive this, my cpu's are idle at the moment and speedstep droped me down for the moment. cache size : 512 KB physical id : 0 siblings: 2 core id : 0 cpu cores : 2 -- If you are a multi-core CPU, this will tell you how many cores per processor. All cores are identical, so if you have a 64-bit Dual/Quad-Core CPU, then all cores are 64bit. 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 pni cx16 lahf_lm cmp_legacy svm extapic cr8_legacy -- you can look for flags that may give away 64bit, such as lahf_lm, lm and nx. bogomips: 2010.67 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 For reference, this is a good read talking about 64 Bit processors and how to identify them. http://en.wikipedia.org/wiki/X86-64 -BEGIN PGP SIGNATURE- Version: GnuPG v2.0.7 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iD8DBQFHzswf8hUIAnGfls4RArR2AJ9X+BYt338vuPAK6Pa0Lmcbtp6GLgCcDAn4 QaXGbnhOKYx2PMKhVBpu5I8= =9QKB -END PGP SIGNATURE- -- gentoo-user@lists.gentoo.org mailing list
Re: [gentoo-user] Detecting 64 bit Intel chips
O/H cypherstrong έγραψε: another way to test is to run a livecd in amd64 mode on new intel chips if it doesn't work, try the ia64 version if it doesn't work ... your intel is a 32 bits version :) no need for the ia64... it's for intel's itanium cpus... ia64 is not compatible with x86... if he had an itanium machine, he would definitely know it... -- Stratos Psomadakis [EMAIL PROTECTED] signature.asc Description: OpenPGP digital signature
Re: [gentoo-user] Detecting 64 bit Intel chips
Of course :) the test for amd64 could be fast with a livecd ... or with cpuinfo and good knowledge of flags Le Wednesday 05 March 2008 17:45:16 Stratos Psomadakis, vous avez écrit : O/H cypherstrong έγραψε: another way to test is to run a livecd in amd64 mode on new intel chips if it doesn't work, try the ia64 version if it doesn't work ... your intel is a 32 bits version :) no need for the ia64... it's for intel's itanium cpus... ia64 is not compatible with x86... if he had an itanium machine, he would definitely know it... signature.asc Description: This is a digitally signed message part.
Re: [gentoo-user] Detecting 64 bit Intel chips
+++ Chris Brennan [gentoo-user] [Wed, Mar 05, 2008 at 11:36:47AM -0500]: Here is the output of my cpuinfo, I'll point out where it will mean 64bit. For the sake of this demonstration, I have only pasted one (1) CPU. [EMAIL PROTECTED] ~ $ cat /proc/cpuinfo processor : 0 vendor_id : AuthenticAMD cpu family: 15 model : 75 model name: AMD Athlon(tm) 64 X2 Dual Core Processor 4200+ -- Here will be your first indication. 64 bit processors, weather they are SPARC, AMD or intel, must identify themselves clearly in the model name field. They do identify themselves, but they may not indicate 64 vs. 32 bit. From my Core2 running 64-bit: processor : 3 vendor_id : GenuineIntel cpu family : 6 model : 15 model name : Intel(R) Core(TM)2 Quad CPUQ6600 @ 2.40GHz stepping: 11 cpu MHz : 2400.000 cache size : 4096 KB physical id : 0 siblings: 4 core id : 3 cpu cores : 4 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 syscall nx lm constant_tsc arch_perfmon pebs bts rep_good pni monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr lahf_lm bogomips: 4799.96 clflush size: 64 cache_alignment : 64 address sizes : 36 bits physical, 48 bits virtual power management: -- // Andrew MacKenzie | http://www.edespot.com // GPG public key: http://www.edespot.com/~amackenz/public.key // You will remember, Watson, how the dreadful business of the // Abernetty family was first brought to my notice by the depth which the // parsley had sunk into the butter upon a hot day. // -- Sherlock Holmes pgpZMoR2s4YHf.pgp Description: PGP signature
Re: [gentoo-user] Detecting 64 bit Intel chips
On 3/5/08, Andrew MacKenzie [EMAIL PROTECTED] wrote: They do identify themselves, but they may not indicate 64 vs. 32 bit. Something one can always do is cat /proc/cpuinfo and then check the family and model at http://gentoo-wiki.com/Safe_Cflags . If it indicates 64-bit profile and Cflags for it, then it is a 64-bit capable processor. :-) -- Ricardo Saffi Marques Laboratório de Administração e Segurança de Sistemas (LAS/IC) Universidade Estadual de Campinas (UNICAMP) Cell: +55 (19) 8128-0435 Skype: ricardo_saffi_marques Website: http://www.rsaffi.com
Re: [gentoo-user] Detecting 64 bit Intel chips
On Wednesday 05 March 2008, Chris Brennan wrote: Here is the output of my cpuinfo, I'll point out where it will mean 64bit. For the sake of this demonstration, I have only pasted one (1) CPU. [EMAIL PROTECTED] ~ $ cat /proc/cpuinfo processor : 0 vendor_id : AuthenticAMD cpu family: 15 model : 75 model name: AMD Athlon(tm) 64 X2 Dual Core Processor 4200+ -- Here will be your first indication. 64 bit processors, weather they are SPARC, AMD or intel, must identify themselves clearly in the model name field. stepping : 2 cpu MHz : 1000.000 -- forgive this, my cpu's are idle at the moment and speedstep droped me down for the moment. cache size: 512 KB physical id : 0 siblings : 2 core id : 0 cpu cores : 2 -- If you are a multi-core CPU, this will tell you how many cores per processor. All cores are identical, so if you have a 64-bit Dual/Quad-Core CPU, then all cores are 64bit. 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 pni cx16 lahf_lm cmp_legacy svm extapic cr8_legacy -- you can look for flags that may give away 64bit, such as lahf_lm, lm and nx. bogomips : 2010.67 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 I am a bit confused now. I always thought my CPU was 32bit. Here are the relevant two lines from my /proc/cpuinfo: model name : Intel(R) Pentium(R) 4 CPU 3.00GHz 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 pebs bts sync_rdtsc pni monitor ds_cpl cid cx16 xtpr lahf_lm So the model name does not indicate anything 64bit while the flags contain lm, nx and lahf_lm. What gives? Uwe -- Informal Linux Group Namibia: http://www.linux.org.na/ SysEx (Pty) Ltd.: http://www.SysEx.com.na/ -- gentoo-user@lists.gentoo.org mailing list
Re: [gentoo-user] Detecting 64 bit Intel chips
On 3/5/08, Uwe Thiem [EMAIL PROTECTED] wrote: I am a bit confused now. I always thought my CPU was 32bit. Here are the relevant two lines from my /proc/cpuinfo: So the model name does not indicate anything 64bit while the flags contain lm, nx and lahf_lm. Like I said, take the family and model and check Gentoo Safe Cflags website. -- Ricardo Saffi Marques Laboratório de Administração e Segurança de Sistemas (LAS/IC) Universidade Estadual de Campinas (UNICAMP) Cell: +55 (19) 8128-0435 Skype: ricardo_saffi_marques Website: http://www.rsaffi.com
Re: [gentoo-user] Detecting 64 bit Intel chips
On Wednesday 05 March 2008, Stratos Psomadakis wrote: O/H cypherstrong έγραψε: another way to test is to run a livecd in amd64 mode on new intel chips if it doesn't work, try the ia64 version if it doesn't work ... your intel is a 32 bits version :) no need for the ia64... it's for intel's itanium cpus... ia64 is not compatible with x86... if he had an itanium machine, he would definitely know it... More like the accountant would definitely know it. I might still have a lingering doubt :-) -- Alan McKinnon alan dot mckinnon at gmail dot com -- gentoo-user@lists.gentoo.org mailing list
Re: [gentoo-user] Detecting 64 bit Intel chips
On Wednesday 05 March 2008, cypherstrong wrote: Of course :) the test for amd64 could be fast with a livecd That might suit someone who's sitting with a new and unknown box on the desk in front of them. I usually have to discover this for machines that are in some unknown location and to which I only have ssh access. Rebooting is most certainly not an option, even if i could get a CD into them. If I do that, the SLA kicks in and that will bankrupt the company... ... or with cpuinfo and good knowledge of flags The combination of what flags does what and which model number is which actual cpu product is much much more complex than I ever thought :-) -- Alan McKinnon alan dot mckinnon at gmail dot com -- gentoo-user@lists.gentoo.org mailing list
Re: [gentoo-user] Detecting 64 bit Intel chips
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Stratos Psomadakis wrote: | O/H cypherstrong έγραψε: | another way to test is to run a livecd in amd64 mode on new intel chips | if it doesn't work, try the ia64 version | | if it doesn't work ... your intel is a 32 bits version :) | | no need for the ia64... | it's for intel's itanium cpus... | ia64 is not compatible with x86... | | if he had an itanium machine, he would definitely know it... | indeed ... -BEGIN PGP SIGNATURE- Version: GnuPG v2.0.7 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iD8DBQFHztg78hUIAnGfls4RApxNAJ9Z2g0kBxZ7SZk4s7rhVKdBWxOSzgCgguz8 lbSGfmbmxDQhK8OLylVy/HE= =eMlf -END PGP SIGNATURE- -- gentoo-user@lists.gentoo.org mailing list
Re: [gentoo-user] Detecting 64 bit Intel chips
On Wed, 5 Mar 2008 15:23:55 +0200, Alan McKinnon wrote: Could that same kind soul please repost the info? And if possible the same for AMD? Run lshw and look at the width value for the CPU. -- Neil Bothwick If all the world is a stage, where is the audience sitting? signature.asc Description: PGP signature
Re: [gentoo-user] Detecting 64 bit Intel chips
On Wednesday 05 March 2008, Neil Bothwick wrote: On Wed, 5 Mar 2008 15:23:55 +0200, Alan McKinnon wrote: Could that same kind soul please repost the info? And if possible the same for AMD? Run lshw and look at the width value for the CPU. Aaaahhh. That has to be the most useful app I've emerged in at least 2 months :-) Very very useful, thanks Neil -- Alan McKinnon alan dot mckinnon at gmail dot com -- gentoo-user@lists.gentoo.org mailing list
Re: [gentoo-user] Detecting 64 bit Intel chips
from what you pasted, you have a 32bit cpu. But you have a flag I do as well, and that is 'ht'. Hyper-Threading is a whole different beast I know very little about, it's more of an Intel thing for there first generation dual-core cpu's. Uwe Thiem wrote: On Wednesday 05 March 2008, Chris Brennan wrote: Here is the output of my cpuinfo, I'll point out where it will mean 64bit. For the sake of this demonstration, I have only pasted one (1) CPU. [EMAIL PROTECTED] ~ $ cat /proc/cpuinfo processor : 0 vendor_id : AuthenticAMD cpu family : 15 model : 75 model name : AMD Athlon(tm) 64 X2 Dual Core Processor 4200+ -- Here will be your first indication. 64 bit processors, weather they are SPARC, AMD or intel, must identify themselves clearly in the model name field. stepping: 2 cpu MHz : 1000.000 -- forgive this, my cpu's are idle at the moment and speedstep droped me down for the moment. cache size : 512 KB physical id : 0 siblings: 2 core id : 0 cpu cores : 2 -- If you are a multi-core CPU, this will tell you how many cores per processor. All cores are identical, so if you have a 64-bit Dual/Quad-Core CPU, then all cores are 64bit. 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 pni cx16 lahf_lm cmp_legacy svm extapic cr8_legacy -- you can look for flags that may give away 64bit, such as lahf_lm, lm and nx. bogomips: 2010.67 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 I am a bit confused now. I always thought my CPU was 32bit. Here are the relevant two lines from my /proc/cpuinfo: model name : Intel(R) Pentium(R) 4 CPU 3.00GHz 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 pebs bts sync_rdtsc pni monitor ds_cpl cid cx16 xtpr lahf_lm So the model name does not indicate anything 64bit while the flags contain lm, nx and lahf_lm. What gives? Uwe -- gentoo-user@lists.gentoo.org mailing list
Re: [gentoo-user] Detecting 64 bit Intel chips
On Wednesday 05 March 2008, Chris Brennan wrote: Here is the output of my cpuinfo, I'll point out where it will mean 64bit. For the sake of this demonstration, I have only pasted one (1) CPU. model name: AMD Athlon(tm) 64 X2 Dual Core Processor 4200+ -- Here will be your first indication. 64 bit processors, weather they are SPARC, AMD or intel, must identify themselves clearly in the model name field. In my case must equates to should. but doesn't The box on my desk identifies the cpu as Pentium4. But it's running 64 bit SLES, so something got omitted on the chip 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 pni cx16 lahf_lm cmp_legacy svm extapic cr8_legacy -- you can look for flags that may give away 64bit, such as lahf_lm, lm and nx. Is there a list somewhere of which flags are definitely 64 bit capabilities only, and which might be found on 32 bit chips? It would not surprise me if a manufacturer announced they had implemented ssse3 on 32 bit silicon for example address sizes : 40 bits physical, 48 bits virtual How about this? Current amd64 implements 48 bit addressing, how wide is it for 32 bit? OTOH my Core2 Duo notebook does not have this field at all For reference, this is a good read talking about 64 Bit processors and how to identify them. http://en.wikipedia.org/wiki/X86-64 I see it's vastly more complex than I ever imagined. Thanks for the link though, learned a lot! -- Alan McKinnon alan dot mckinnon at gmail dot com -- gentoo-user@lists.gentoo.org mailing list
Re: [gentoo-user] Detecting 64 bit Intel chips
On Wednesday 05 March 2008, Chris Brennan wrote: from what you pasted, you have a 32bit cpu. But you have a flag I do as well, and that is 'ht'. Hyper-Threading is a whole different beast I know very little about, it's more of an Intel thing for there first generation dual-core cpu's. HT is an abomination that should not be suffered to live. It's Intel's attempt to implement application level threading in silicon and it simply does not work in practice. I've yet to benchmark any reasonably complex app that runs better with hyper-threading enabled. In fact when I still worked support at a certain database vendor we simply refused to support any of our apps running on machines where HT was enabled. Note that it wasn't you should not do this, it was go away and phone back when you have rebooted with sane kernel options :-) -- Alan McKinnon alan dot mckinnon at gmail dot com -- gentoo-user@lists.gentoo.org mailing list
Re: [gentoo-user] Detecting 64 bit Intel chips
well said ... Alan McKinnon wrote: On Wednesday 05 March 2008, Chris Brennan wrote: from what you pasted, you have a 32bit cpu. But you have a flag I do as well, and that is 'ht'. Hyper-Threading is a whole different beast I know very little about, it's more of an Intel thing for there first generation dual-core cpu's. HT is an abomination that should not be suffered to live. It's Intel's attempt to implement application level threading in silicon and it simply does not work in practice. I've yet to benchmark any reasonably complex app that runs better with hyper-threading enabled. In fact when I still worked support at a certain database vendor we simply refused to support any of our apps running on machines where HT was enabled. Note that it wasn't you should not do this, it was go away and phone back when you have rebooted with sane kernel options :-) -- gentoo-user@lists.gentoo.org mailing list
