information, although in the 2.6 kernel much of that information moved to a separate pseudo-file system, sysfs, mounted under : depending on the mode of power management (if at all), either directory, or , which predate sysfs and contain various bits of information about the state of power management. , information about the buddy algorithm that handles memory fragmentation. , containing directories representing various buses on the computer, such as PCI/USB. This has been largely superseded by sysfs under /sys/bus which is far more informative. , a list of the available framebuffers , giving the boot options passed to the kernel , containing information about the CPU, such as its vendor (and CPU family, model and model names which should allow users to identify the CPU) and its speed (CPU clockspeed), cache size, number of siblings, cores, and CPU flags. includes a value for "bogomips", frequently misconstrued as a measure of CPU speed, like a benchmark, but it does not actually measure any sensible (for end-users) value at all. It occurs as a side-effect of kernel timer calibration and yields highly varying values depending on CPU type, even at equal clock speeds. On multi-core CPUs, /proc/cpuinfo contains the fields for "siblings" and "cpu cores" which represent the following calculation is applied: "siblings" = (HT per CPU package) * (# of cores per CPU package) "cpu cores" = (# of cores per CPU package) A CPU package means physical CPU which can have multiple cores (single core for one, dual core for two, quad core for four). This allows a distinction between hyper-threading and dual-core, i.e. the number of hyper-threads per CPU package can be calculated by siblings / CPU cores. If both values for a CPU package are the same, then hyper-threading is not supported. For instance, a CPU package with siblings=2 and "cpu cores"=2 is a dual-core CPU but does not support hyper-threading. , a list of available cryptographic modules , a list of character and block devices sorted by device ID but giving the major part of the name too , giving some information (including device numbers) for each of the logical disk devices , a list of the file systems supported by the kernel at the time of listing , , and the directory , giving some details about the devices (physical or logical) using the various system resources , holding messages output by the kernel ,