PAE is the second method supported to access memory above 4 GB (PSE36 being the first) this method has been widely implemented. PAE is the added ability of the IA32 processor to address more than 4 GB of physical memory using Intel’s 36bit page addresses instead of the standard 32bit page addresses to access a total of 64gibibytes of RAM. It is rumoured to stand for MultiMedia eXtension or Multiple Math or Matrix Math eXtension, but officially it is a meaningless acronym trademarked by Intel. If multiple programs use the same registers by both logical CPUs, Hyper-threading can actually be known to slow down overall performance in some cases. 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 #Proc cpuinfo flags fullHowever, uname -a returns: Linux compname 3.2.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. My first thought was that a non-SMP kernel was installed. Model name : Intel(R) Core(TM) i7 CPU 920 2.67GHzįlags : 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 rdtscp lm constant_tsc up arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc aperfmperf pni dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm sse4_1 sse4_2 popcnt lahf_lm ida dts tpr_shadow vnmi flexpriority ept vpidĪddress sizes : 36 bits physical, 48 bits virtualįrom my recollection of previous installs with SMP working, there should be multiple entries in /proc/cpuinfo-one per processor. I have an i7 920 (quad core with hyperthreading), so I should be seeing 8 processors, but I only see one in the System Monitor graph. #Proc cpuinfo flags installI just upgraded my system and did a clean install of Ubuntu when I did (Installed Oneiric Ocelot from the CD last week but yesterday upgraded to 12.04 LTS).
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