Proc cpuinfo flags4/15/2023 ![]() ![]() The ability to use one physical CPU as two separate logical CPUs by taking advantage of unused CPU registers during typical operation in an attempt to make the CPU more efficient. Hyper-Transport (AMD CPUs) or Hyper-Threading (Intel CPU) The destination is a 512-byte memory location. (The FXSAVE instruction writes the current state of the x87 FPU, MMX technology, Streaming SIMD Extensions, and Streaming SIMD Extensions 2 data, control, and status registers to the destination operand. All Pentium CPUs and later have this functionality built in.įXSAVE/FXRSTOR. Used to be a separate chip on the 80486SX and earlier (called the 80487 or 80387, etc. This is where most mathematically intense calculations take place. X87 Floating Point Unit built into the CPU. Uses 64bit CPU registers and 64bit physical RAM addresses (page addresses) to support up to 1 tebibyte of RAM, which can later be extended (through future processor revisions) to 1 Pebibyte. Intel’s derivative of AMD’s 64bit CPU technology. Without CMPXCHG16B the only way to perform such an operation is by using a critical section.) This is useful for high resolution counters that could be updated by multiple processors (or cores). (CMPXCHG16B allows for atomic operations on 128-bit double quadword (or oword) data types. Also known as f00f (pronounced “foof”), an abbreviation of f0 0f c7 c8, is the hexadecimal encoding of an instruction that exhibits a design flaw in the majority of Intel Pentium, Pentium MMX, and Pentium OverDrive processors).ĬMPXCHG16B Instruction. On Intel P-4s, the TSC runs with constant frequency independent of cpu frequency when EST is used.ĬMPXCHG8B Instruction. Register showing the CPU is not Hyper-Threading capable. (A certification for experienced PCB design professionals.) Most probably this stands for Certified Interconnect Designer. Could also pertain to AMD’s 3DNow! Enhanced/Extended.Īdvanced Configuration and Power Interface.Īdvanced Programmable Interrupt Controller. Here is what I found:Ī multimedia extension created by AMD for its processors – enhancemend of MMX.ģDNOW Extensions. Most of the output is self explained, but flags is little bit difficult. Model name : Intel(R) Xeon(TM) CPU 3.06GHzįlags : fpu tsc msr pae mce cx8 apic mtrr mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe cid xtpr flags – Defines a number of different processor attributes, such as the presence of a floating-point unit (FPU) and the ability to process MMX instructions.I was looking to find a good explanation what are the meanings of CPU flags (shown by cat /proc/cpuinfo), but did not find full explanation.cache size – Tells you the amount of level 2 memory cache available to the processor.cpu MHz – Shows the processor’s precise speed, in megahertz, to the thousandth decimal point.model name – Gives you the common name of the processor, including the project name.This is helpful to determine the type of architecture of an older system and is helpful in determining which compiled RPM package would best suit that system. If your computer is an Intel-based system, simply place the number in front of “86” to determine the value. cpu family – Authoritatively tells you the type of processor you have in the system.If you have more than one processor it will display all processor information separately counting the processors using zero notation. If you have one processor it will display a 0. processor – Provides each processor with an identifying number.Model name : Intel(R) Xeon(R) CPU E5-2660 0 2.20GHzįlags : 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 pdpe1gb rdtscp lm constant_tsc arch_perfmon pebs bts rep_good xtopology nonstop_tsc aperfmperf pni pclmulqdq dtes64 monitor ds_cpl vmx smx est tm2 ssse3 cx16 xtpr pdcm pcid dca sse4_1 sse4_2 x2apic popcnt tsc_deadline_timer aes xsave avx lahf_lm ida arat epb pln pts dtherm tpr_shadow vnmi flexpriority ept vpid xsaveoptĪddress sizes : 46 bits physical, 48 bits virtualīelow is the various items you would see in the output and their respective explanations.
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