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| | Cache - Wikipedia, the free encyclopedia |
 | | In computer science, a cache (pronounced cash) is a collection of data duplicating original values stored elsewhere or computed earlier, where the original data is expensive (usually in terms of access time) to fetch or compute relative to reading the cache. | | | Caches have proven extremely effective in many areas of computing because access patterns in typical computer applications have locality of reference. | | | In this sense, the phrases disk cache and cache buffer are misnomers, and the embedded computer's memory is more appropriately called the disk buffer. |
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http://en.wikipedia.org/wiki/Cache
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| | PC Architecture. Chapter 10. The cache |
| | The cache system tries to ensure that relevant data is constantly being fetched from RAM, so that the CPU (ideally) never has to wait for data. | | | For example, an Athlon processor may have a 32 KB data cache and a 32 KB instruction cache. | | | The CPU’s cache is “intelligent”, so that it can reduce the data traffic on the front side bus. |
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http://www.karbosguide.com/books/pcarchitecture/chapter10.htm
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| | Theories About Modern CPU Cache |
| | The caches may be big, but the data and code L1 caches and even the L2 cache are only 2 way associative. | | | For example, the K5 CPU has a 16Kb data cache with 4-way association so the CPU can have 4-4Kb blocks of the main memory in the L1 cache. | | | Now in the new CPU's, like the Coppermine and Athlon, if the CPU has to go to the main memory, it can mean that the CPU slows down to the speed of the main memory. |
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http://www.overclockers.com/articles139
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| | HDD Cache Vs CPU Cache - Neowin.net |
| | HDD cache follows a similar principle in that it stores data from the platters based on what the operating system is doing (and the cache is of course much faster than reading/writing from the platters). | | | Generally, the first CPU cache is an instruction cache that is designed to help branch prediction in order to prevent the performance loss that comes with the long pipelines of the new CPUs when they encounter a branch. | | | The second cache is a high speed buffer between the CPU and the RAM memory that's on the motherboard. |
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http://www.neowin.net/forum/index.php?showtopic=192160
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| | Design of CPU Cache Memories |
| | Our stress is on those issues of greatest concern to cache designers and builders, including line size, associativity, real vs. virtual addressing, main memory up date algorithm, split (data/instructions) cache vs. unified cache, cache consistency mechanisms, cache size and number of cache levels. | | | The Fairchild CLIPPERtm is used as an example of modern cache memory design. | | | Abstract: We present an overview of the current issues in the design of CPU cache memories. |
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http://techreports.lib.berkeley.edu/accessPages/CSD-87-357.html
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| | ChannelWeb Encyclopedia |
| | Today, the CPUs of almost all computers are contained on a single chip. | | | Computer professionals involved with mainframes and minicomputers often refer to the whole computer as the CPU, in which case, CPU refers to the processor, memory (RAM) and I/O architecture (channels or buses). | | | The CPU, clock and main memory make up a computer. |
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http://www.channelweb.com/encyclopedia/defineterm.jhtml?term=CPU
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| | CPU Director |
| | CPU Director is not compatible with earlier versions of Mac OS X. If you are running a version of Mac OS X below 10.2, you should upgrade using the "Software Update" System Preference panel. | | | Note that with later versions of Mac OS X, the text "Probing L2 Cache" may not be displayed while CPU Director is initially configuring the cache. | | | You may disable or enable the cache at will, however, which is useful for benchmarking purposes. |
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http://www.powerlogix.com/products/cpudirector
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| | AnandTech - CPU Cache Difference - Opteron vs Athlon 64 |
| | cache is memory that the cpu has enbedded in its die. | | | larger cache size means that the cpu can store more information locally, where it is ready to be processed rather than calling data from the ram. | | | this means that a large cache size means squat, unless you are running a dual core processor, or literally multiple processors. |
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http://forums.anandtech.com/messageview.cfm?catid=28&threadid=1787162
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| | X-Setup Pro Forum - CPU Cache Mod |
| | This entry is designed as a secondary source of cache size information for computers on which the HAL cannot detect the L2 cache. | | | This is not related to the hardware; it is only useful for computers with direct-mapped L2 caches. | | | I have a Pentium 4 Prescott 3.4GHz with 1Mb L2 cache running at 4.01GHz, and everything I have read on various forums says that by physically specifying the L2 cache size in the XP registry there is a noticeable speed improvement. |
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http://www.x-setup.net/forum/printthread.php?t=372
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| | How do i change P4 CPU Cache level - Dev Hardware |
| | Is there a way to change the CPU Cache level. | | | Discuss How do i change P4 CPU Cache level in the CPU Overclocking forum on Dev Hardware. |
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http://www.devhardware.com/forums/cpu-overclocking-19/how-do-i-change-p4-cpu-cache-level-31642.html
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| | CPU-Z |
| | The cache latency computation tool allows to gather information about the cache hierarchy of the system. | | | Please notice that code caches are not reported. | | | For each cache level, it provides its size and its latency. |
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http://www.cpuid.com/cpuz.php
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| | An illustrated Guide to CPU improvements |
| | Today, bigger and better CPU cache is a natural step in the development of new CPUs. | | | cache integrated to the CPU and working at the full clock speed. | | | These two features help minimize the data flow in and out of the CPU. |
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http://www.karbosguide.com/hardware/module3b2.htm
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| | Centralized Shared-Memory Architectures |
| | The caches are usually on a shared memory bus. | | | Since it is popular to use multi-level caches in multiprocessors (to reduce memory bandwidth), this solution is usually adopted. | | | With multiple caches, one CPU can modify memory at locations that other CPUs have cached. |
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http://www.cs.umbc.edu/~plusquel/611/slides/chap8_2.html
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| | VMTN Discussion Forums: ESX and CPU Cache? ... |
| | The reason larger caches in the Intel market have actually been better than clockspeed in enhancing ESX performance is that with the amount of memory IO being performed for ESX to do its thing, low latency memory access such as that provided by large caches will perform better. | | | Yes, The more processor cache the better the VM performance will be. | | | Also the AMD architecture, which I realize Dell has rejected, performs better at lower clockspeeds (and no L3 cache) than Intel with a high cache, because of the embeded Memory controller on the AMD chip and HT (Hyper Transport) which provides such low memory access latencies to all memory that L3 cache is unnecessary. |
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http://www.vmware.com/community/message.jspa?messageID=141366
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| | CPU cache MOD ? - Neowin.net |
| | the stuff you think are cache are actually capacitors, not cache, cache in the celeron processor had always been embedded into the core logic. | | | The cache is in the processor die, which is under the metal plate in the center. | | | If so, the cache IS embedded in the core and no way to remove it. |
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http://www.neowin.net/forum/index.php?act=findpost&pid=584771145
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| | What is L2 cache? |
| | An on-die L2 cache is a faster alternative to an SRAM cache, particularly as CPU clock speeds continue to increase. | | | Although the BSB can run at the same speed as the CPU, cache memory capable of such speeds is much more expensive. | | | Therefore, in the Pentium-II, the more economical half-speed cache is used (for a full-speed BSB, check out Intel's Xeon line). |
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http://www.cpuscorecard.com/cpufaqs/oct99a.htm
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| | CPU cache MOD ? - Neowin.net |
| | The part that all other 0.18-micron Intel CPUs have been derived from is the Pentium III based on the Coppermine core with 256KB of on-die L2 cache operating at clock speed. | | | Internally, they are based on a core known as the Coppermine128, which refers to the 128KB of on-die L2 cache they are outfitted with versus the 256KB that is on the regular Coppermine Pentium III core. | | | Further reading into that Anadtech article reveals that the Coppermine Celerons are not P3 rejects and do not have the cache disabled, the extra cache is just not there and there is NO way to put it there. |
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http://www.neowin.net/forum/index.php?s=51a86e8684f0553cd79c37154f43a246&showtopic=233147&st=15&p=584771283&
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| | CPUSpy - CPUID and Cache Test Utility |
| | This can be used to compare between processors features such as bus speed, maximum frequency, cache sizes, release dates, codename, and transistor count. | | | Later processors also support extended features such as cache details, processor features, design speed and processor name. | | | Most x86 processors support the CPUID instruction which returns data describing the make and model of the CPU. |
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http://www.sinnercomputing.com/CPUSpy.htm
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| | Change Cpu L2 Cache |
| | L2, and is the first place the CPU looks for its data. | | | Want information on change cpu l2 cache, we can help. | | | Remember the camera needs time to focus on objects, make sure enough time is spent on each scene before moving the camera to another subject. |
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http://video-camcorders.com/change-cpu-l2-cache.html
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| | pcwiz inc PC Diagnostics & Data Recovery Software: WhatCPU CPU and Cache Detection Software, the easy way to see the ... |
| | Possibly not, but CPU makers work hard to make their chips reliable, and a remarked CPU might not be as reliable because of going through extra handling and other reasons. | | | MODERN CPUID DETECTION BUILT IN As you might know, all the most modern CPUs contain a special CPU ID instruction by which the CPU tells application software who and what the CPU is. WhatCPU uses that instruction to its fullest and gives you complete information about the CPU as a result. | | | We slaved over our hot software stove to cook up a CPU detector that works FAST and sure to show you what CPU you have in your computer, ranging from the latest to the oldest. |
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http://www.datadepo.com/whatcpu.htm
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| | [No title] |
| | There are two + * requirements for safe access to the per-CPU cache: (1) the thread + * accessing the cache must not be preempted or yield during access, + * and (2) the thread must not migrate CPUs without switching which + * cache it accesses. | | | * @@ -626,12 +599,20 @@ int cpu; /* - * We have to lock each cpu cache before locking the zone + * XXX: It is safe to not lock the per-CPU caches, because we're + * tearing down the zone anyway. | | | - * - * I may rewrite this to set a flag in the per cpu cache instead of - * locking. |
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http://www.watson.org/~robert/freebsd/netperf/20050417-uma-critical.diff
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| | Cpu cache? what the hell - TechSpot OpenBoards |
| | The higher the cache the better it is basically information stored on the chip is a pretty good not techie explanation.... | | | I don't understand the l1 cache, look at this. | | | Level 1 Cache: 8 KB Level 2 Cache: 512 KB this has got me very confoosed |
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http://www.techspot.com/vb/topic22735.html
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| | Latest News. CPU Rightmark |
| | This release solves an issue with "Invalid CPU database header" error message at the program startup. | | | The RightMark Team is pleased to announce the new RAMTester tool that is meant for checking memory modules reliability under MS Windows (x86 and x64) on the example of virtual addresses. | | | Added CPU load level determination on Intel Pentium II/III/M/4 family CPUs. |
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http://cpu.rightmark.org
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| | MAChSpeed G4 PISMO - Mac CPU Upgrade for Performance Proccessor Upgrades in PowerBook G3 systems. |
| | Real Time CPU Speed Modifications: On PowerPC 750fx and 750gx systems (iBook G3) and upgrades, it allows users to dynmically change their speed (these are the 800-1100 MHz G3 CPUs). | | | This feature aChange the CPU speed on the fly via software (750 fx/gx only). | | | Smart Recovery: The software will lower the cache speed when it detects a cache system crash. |
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http://daystartechnology.com/Apple_Mac_Products/XLR8_Macintosh_Products/Mac_CPU_Cache_Control_Software_PS.html
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| | CPU Cache? - MajorGeeks Support Forums |
| | I want a 3.0 ghz, I found 2 P4 3.0s but one has 512K cache and the other is double that. | | | a larger cache will make your computer run faster. | | | Get the 512k, that core, despite having less cache, is: |
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http://forums.majorgeeks.com/showthread.php?t=32797
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| | How to find CPU Cache ? (apart from dmesggrep CPU) - LinuxQuestions.org |
| | If you use /proc/cpuinfo you only get the Level 2 cache shown and I'd like to ALSO show the Level 1 caches and any Level 3 caches that there may be... | | | I would agree that cpuinfo, or something similar, should display a break down of L1/L2/L3 cache. | | | Switching off a CPU of a multiple CPU machine |
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http://www.linuxquestions.org/questions/showthread.php?p=2012586#post2012586
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| | Internal CPU cache problem - PC-Media Tech Forums |
| | Usually, this option pertains to the Cyrix class of CPU because of its cache design. | | | Installed Windows 98 and still if I enable internal cpu cache, it will boot as far as "verifying DMI pool" and stop. | | | If you are overclocking, set the system to spec while the O/S is loaded. |
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http://www.pcmech.com/forum/showthread.php?threadid=23578
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| | PCTechTalk - CPU cache |
| | When selecting the chip for you, its important to take into account the sort of things you plan to do on the machine. | | | Soo, I'm wondering is the Pent folks just dont mention these, or its a totally different thing, me brain is boggled on this one, and would really like some input before i go blow a few hundred bucks on a cpu i dont really understand,! | | | I guess i noticed this doing the AMD vs Pentium, lots of the AMDs i saw the two lvls of cache, where the Pentium only had the one,... |
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http://www.pctechtalk.com/forums/showthread.php?t=17982
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| | L1/L2 CPU cache - dBforums |
| | The biggest diffrence (i can see) is that the Xeon uses 8/512 L1/L2 cache and Opteron uses 128/1024 L1/L2 cache. | | | dBforums > Database Server Software > PostgreSQL > L1/L2 CPU cache | | | Im wondering if a database server relies (heavily) on L1/L2 cache because if it does, i reckon im better off with Opteron, if not.. |
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http://www.dbforums.com/t989464.html
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| | CPU & Cache R&R Service |
| | This product includes the labor required to remove and replace any standard PowerPC 750/7400/7410/7450/7455 CPU and Cache with a new CPU and Cache | | | It is intended as a repair service for systems and upgrade cards requiring a CPU replacement for operation. | | | This labor charge does not include the CPU part required for the operation. |
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http://daystar-store.com/browseproducts/CPU---Cache-R-R-Service.html
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| | NodeWorks - Encyclopedia: L1 |
| | The term L1 may refer to The Level-1 CPU cache in a computer The first lumbar vertebra in Human anatomy The first Lagrange Point in an astronomical Solar System L1 (protein), a cell adhesion molecule. |
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http://pedia.nodeworks.com/L/L1
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| | hardCOREware Forum - upgrading cpu cache |
| | That cache was running at 50% of the Pentium 3's CPU speed. | | | Why is it that my 5 year old Pentium 3 processor has 512 L2 cache and 16k L1 cache when brand new P4/1.6ghz cpus are made with 256 L2 and 8 L1?? | | | Take some basic economics courses man, demand has to match supply enough to cover cost of manufacturing and make a profit. |
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http://www.hardcoreware.net/forum/printthread.php?t=5035
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