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> How to check if your processor is 32 bits or 64 bits
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redman
 Posted: Jun 14 2011, 06:15 PM
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If you are unsure if your system/processor is 32 bits or 64 bits, give the following command:
CODE
$ grep flags /proc/cpuinfo

And that outcome will reveal it.

For example, if you get this:
QUOTE
$ grep flags /proc/cpuinfo
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 arch_perfmon pebs bts aperfmperf pni dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm xsave lahf_lm tpr_shadow vnmi flexpriority
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 arch_perfmon pebs bts aperfmperf pni dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm xsave lahf_lm tpr_shadow vnmi flexpriority

Then the system is capable of running SL 64 bits.
You need to check if among the flags there is "lm".
The "lm" flag means "Long Mode" cpu -> 64 bits

Anything else, without "lm", means that you can only install SL 32 bits.

For example:
QUOTE
$ grep flags /proc/cpuinfo
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 pebs bts cid xtpr
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 pebs bts cid xtpr

QUOTE
$ grep flags /proc/cpuinfo
flags  : fpu vme de pse tsc msr pae mce cx8 mtrr pge mca cmov pat pse36 mmx fxsr sse up



Note: using "uname" will not work since uname only gives information on the used OS.
That means that installing SL 32 bits on a 64 bits system will reveal i386/i686 when using uname.


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