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Output of /proc/cpuinfo shows different Physical-id`s (0,0,3,3). what does this mean ?
why it is displaying physical id 3 in next two logical processor.If it is taking slotwise then it should display 1.
Except, kernels don't always include support for more then 2 cpu's. Any extra cpu makes the kernel a little bit bigger in memory. There's no easy way to found out. But if you want, download the kernel sources from your distrubution and kernel version and variant, then do a make config, and tell it to use the existing .config file, then peruse the options until you get to the one that defines how many cpu's are supported. Tedious at best, and as long as you don't do a make followed by a make install, there is no risk of messing up your system in any way, except to take up 200+MB of disk space.