On Fri, Sep 27, 2013 at 05:04:00PM +0200, Helmut Hullen wrote: > I want to detect the existence of an SMP CPU (multi core CPU). I've > tried the contents of "/proc/cpuinfo" and the output of "lscpu". > > Both ways only showed the existence of both processors of my AMD CPU > when I run them under a kernel which was compiled with the option > "SMP=Y". > > The "help" for this kernel option proposes to set this option only if > the kernel really runs on such a CPU. > > Is there any way to detect a multi core CPU under a kernel which is > compiled with "SMP=n"? If you don't want to rely on kernel information than you probably have to use CPUID and some assembler magic to get CPU topology http://wiki.osdev.org/Detecting_CPU_Topology_(80x86) or maybe you can use CPU flags from /proc/cpuinfo (I guess the flags does not depend on SMP=y/n. It's probably better to ask at lkml :-) Karel -- Karel Zak <kzak@xxxxxxxxxx> http://karelzak.blogspot.com -- To unsubscribe from this list: send the line "unsubscribe util-linux" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
