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Topic: L1 cache

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	CPU cache - Wikipedia, the free encyclopedia
		A CPU cache is a cache used by the central processing unit of a computer to reduce the average time to access memory.
		A victim cache is a cache used to hold blocks evicted from a CPU cache due to a conflict or capacity miss.
		This cache is generally implemented on a separate chip from the CPU, and, as of 2004, may range in size from 2 to 256 megabytes.
	en.wikipedia.org /wiki/CPU_cache (6989 words)

	Caching
		Cache يک مفهوم کامپيوتری است که بر روی هر نوع کامپيوتر با يک شکل خاص وجود دارد.
		Caching يک نکنولوژی استفاده شده برای زير سيستم های حافظه ، در کامپيوتر است.
		بهرحال استفاده از Cache اثرات مثبت خود را بدنبال داشته و باعث بهبود کارآئی پردازنده می گردد.اگر مقدار L2 Cache معادل 256 کيلو بايت و ظرفيت حافظه اصلی معادل 64 مگابايت باشد ، 256000 بايت مربوط به Cache با استفاده از روش های موجود قادر به Cache نمودن 64000000 بايت حافظه اصلی خواهند بود.
	www.zendagi.com /caching.htm (1002 words)

	What is a L1 cache?
		L1 cache is a small, fast memory cache that is built in to a CPU and helps speed access to important and frequently-used data.
		L1 cache is typically smaller and faster than L2 cache.
		L1 cache is an abbreviation of Level 1 cache.
	www.tech-faq.com /l1-cache.shtml (64 words)

	FAQ Cache, Snoop & Long Bursts (Site not responding. Last check: 2007-09-30)
		If the data to be written is not in the cache, the cache manager frees a cache entry with the same algorithm as in reading mode, then the entire input is loaded into cache from the memory, so the data is in the cache.
		The L2 cache works more or less the same way as the L1 cache, except that it is a victim of the L1 cache, it means that an entry can be allocated to the L2 cache only when a L1 entry has been freed.
		The cache intervention is a mechanism that for instance during a read cycle of a DIRTY data from the PCI, allows the host bridge to fetch the data directly from the processor cache rather than from memory.
	www.cetia.com /FAQs/FAQ-16.htm (2750 words)

	Cache Memory
		Intel Corp.'s Pentium III processor has 32KB of L1 cache on the processor chip and either 256KB of L2 on-chip or 512KB of L2 off-chip.
		When the CPU finds data in one of its cache locations, it's called a "hit"; failure to find it is a "miss." Every miss introduces a delay, or latency, as the processor tries a slower level.
		Caches are more important in servers than in desktop PCs because servers have so much traffic between processor and memory generated by client transactions.
	www.computerworld.com /printthis/2000/0,4814,44333,00.html (809 words)

	What is Cache Memory (Site not responding. Last check: 2007-09-30)
		In simplest terms, cache memory is a special type of super fast memory built onto or next to the processor.
		L1 cache is also known as onboard or primary cache and is built into the CPU itself.
		L1 cache is typically very small in size (for most computers it is 16KB although this is changing rapidly) but it is very fast.
	www.ecscolorado.com /faqs/cache.htm (356 words)

	Glossary Search Results
		L2 cache (Level 2 Cache) - A piece of fast memory that sits between the L1 cache of the processor and main memory.
		It is usually larger than L1 cache, and the L1 cache checks the L2 cache before going to main memory for data (unless the L1 and L2 caches are unified--see unified cache).
		L3 cache is then the extra cache that sits on the motherboard between the processor and main memory, since the processor already contains L1 and L2 cache.
	www.geek.com /glossary/glossary_search.cgi?l (2831 words)

	L1 Cache (Site not responding. Last check: 2007-09-30)
		A memory cache, sometimes called a cache store or RAM cache, is a portion of memory made of high-speed static RAM (SRAM) instead of the slower and cheaper dynamic RAM (DRAM) used for main memory.
		Disk caching can dramatically improve the performance of applications, because accessing a byte of data in RAM can be thousands of times faster than accessing a byte on a hard disk.
		When data is found in the cache, it is called a cache hit, and the effectiveness of a cache is judged by its hit rate.
	bugclub.org /eric/memory/l1cache.html (340 words)

	The Elements of Cache Programming Style
		Cache line misses, page faults and HTTP requests are the same thing at different levels of this hierarchy.
		The Pentium II L1 cache is a Harvard, or split instruction/data cache.
		So for the 4-way set associative L1 cache on a Pentium II there are 4 cache lines available for the scheduling related cache line for all of the task_structs.
	www.linuxshowcase.org /2000/2000papers/papers/sears/sears_html (6220 words)

	Dynamic Exclusion Replacement Policy
		Whenever an instruction is not in the L1 cache, the next level cache (L2) or the lower level of memory hierarchy holds its hit-last bit.
		As the cache size increases, the chance of potential conflict misses drops down and hence the performance gap between the Dynamic Exclusion and the conventional direct-mapped cache reduces.
		At the L1 cache size of 8KB, we observe a maximum reduction of 38% for 'gs' and a minimum reduction of 11% for 'video_play'.
	www.cs.cmu.edu /~dongw/ghosh (3063 words)

	Memory and Alignment
		Caches are small segments of extremely fast memory that are used to hold recently used data and instructions.
		In some cases there is a level 3 cache that may be as large as 2 megabytes, as on the PPC 7450.
		The L1 data cache on the 7400, 7410, 7450 and 7455 is eight way set associative.
	developer.apple.com /hardware/ve/caches.html (3351 words)

	The Definitive Guide On L2 Cache Latency
		The next level of cache, called L2 or secondary cache, is situated outside the core and usually runs at a lower clockspeed than the core though it may also run as fast as the core itself.
		However, the size of the L2 cache is always much larger than the L1 cache and if it runs fast enough, its throughput can come close to that of the L1 cache.
		That means working down the L2 cache latency values one by one and stressing the processor (which stress the L2 cache also) each time to ensure it will work with such a latency.
	www.adriansrojakpot.com /Speed_Demonz/L2_Cache_Latency/L2_Cache_Latency_02.htm (484 words)

	Cache hierarchy parameters
		The cache uses an LRU-like replacement policy within each set (the policy uses LRU ages, but prefers to evict lines held in shared state rather than lines held in exclusive state, and unmodified lines rather than modified lines).
		If a write-through L1 cache is used, this parameter specifies the number of cache lines in the coalescing write-buffer.
		With a write-back L1 cache, this parameter is ignored.
	www-ece.rice.edu /~rsim/Manual/node40.html (398 words)

	Cache
		Much like a pirate’s cache of his gold and jewels, a processor cache is the part of the processor where valuable data and program segments are kept.
		L2 cache is similar to the shelves behind the desk.
		Exclusive cache, and the effective cache size is the combination of the L1 and L2 cache.
	www.amd.com /gb-uk/Processors/SellAMDProducts/0,,30_177_4458_4513^1413^2128,00.html (471 words)

	An illustrated Guide to CPU improvements
		Cache RAM becomes especially important in clock doubled CPUs, where internal clock frequency is much higher than external.
		Then the cache RAM enhances the "horsepower" of the CPU, by allowing faster receipt or delivery of data.
		The next layer is the L2 cache, which are small SRAM chips on the motherboard.
	www.karbosguide.com /hardware/module3b2.htm (419 words)

	More L1 Cache? - Discussion@SR
		The question he asked me was: "Why the heck don't they bother adding L1 cache instead?" Stunned at simply the thought of this, I just kinda stared at him trying to think of an answer.
		long pipeline, trace cache, instruction handling etc. the L1 cache on the P4 chip will not be useful in the same way that it is on, say, an athlon chip.
		The Advanced Transfer Cache on the P4 can transfer data on every clock cycle (as opposed to the P3's every 2nd cycle), so i guess Intel could afford to reduce the L1 cache size because it was faster anyway.
	forums.storagereview.net /index.php?showtopic=8971 (353 words)

	Hardware Analysis - Forum - Pentium4 L1 cache (Dan or Sander)
		If you make the cache bigger, it (a) takes longer to sort/find your data, and (b) is physically further away on the die of the processor, which means electrons have to travel further.
		I thought the Katmai to Coppermine cache design change was the same as when AMD went from the original Athlon core to the Thunderbird core......
		That being, the cache went from being off die at speeds being at some divisor of the processor speed to on-die cache at the same speed as the processor.
	www.hardwareanalysis.com /content/topic/141 (1383 words)

	Building the General Matrix Multiply From the L1 Cache-contained Multiply
		Once in block-major format, the blocks are contiguous, which eliminates TLB problems, minimizes cache thrashing and maximizes cache line use.
		The non-copy L1 matmul will generally not be as efficient as the copy L1 matmul; at this problem size the main drawback is the additional pointer arithmetic required in order to support the user-supplied leading dimension.
		To handle this problem, ATLAS simply compares the speed of the copy and non-copy L1 matmul for variously shaped matrices, varying the problem size until the copying provides a speedup (on some platforms, and with some shapes, this point is never reached).
	www.netlib.org /atlas/developer/atlas_contrib/node11.html (581 words)

	L1 Cache Faulty? - TechSpot Troubleshooting
		i disabled the L1 cpu cache and it will boot normally into windows and will navigate and stay on as long as i've allowed it (although slow as molasses in january is an understatement....totally not useable in this state).
		I should mention that when i did boot up with L1 cache* off, it came up with a LSA shell (export version) error, and later that it recovered from a serious error on nov 2/04........
		Turning the L1 cache off will starve the CPU so it will work only at a fraction of its capacity.
	www.techspot.com /vb/all/windows/t-16658-L1-Cache-Faulty.html (438 words)

	Scott Sanders :: blog :: L1/L2 Cache object for django
		I started hacking on an L1/L2 cache implementation for django, and since I won’t be able to finish it anytime soon, I am posting it here for someone else to pick up and use.
		I tested with _LocMemCache as the L1, and both _MemCache and _FileCache as the backend.
		Well, if you wanted to use it in django, you would need to register it in the cache infrastructure, add a parser to create an L1 and L2 instance, etc. If anyone wants to put it into django, you are more than welcome.
	dotnot.org /blog/archives/2005/12/21/l1l2-cache-object-for-django (224 words)

	why L1 and L2 cache
		L1 and L2 caches, it cannot be possible.
		So everybody but HP uses a fast but small L1 cache, and a large but slow L2 cache.
		cache with somewhat longer latency (but still less than memory latency).
	www.castalk.com /ftopic11403.html (1614 words)

	Measuring L1 I-cache misses on P4
		I'm interested in measuring L1 I-cache hits/misses for a program of
		The P4 doesn't have an instruction cache, it has a trace cache.
		cache misses occur in your code, to help you tune it.
	www.castalk.com /ptopic23.html (362 words)

	Shopping.com - Find, Compare, and Buy Anything in Seconds
		Processor, 2048 KB Cache Memory, For Socket 940, 1000 MHz Bus Speed
		Processor, 2048 KB Cache Memory, For Socket 939, 1000 MHz Bus Speed
		Processor, 1024 KB Cache Memory, For Socket 940, 1000 MHz Bus Speed
	www.shopping.com /xGS-L1_Cache (784 words)

	L1 Cache (Site not responding. Last check: 2007-09-30)
		All new processors has L1 and L2 caches embeded.
		Some old processors (Intel Pentium, AMD K6) don t have integrated L2 cache and this type of...
		larger than L1 cache, and the L1 cache checks the L2 cache before going to main memory for data (unless the L1 and L2 caches are...
	www.fantomcd.net /L1-Cache.html (93 words)

	L1 Cache Faulty? - TechSpot OpenBoards
		Insertional mutagenesis of nodSU drastically decreases Nod factor production, but with the exception of sulfated factors (which are partially N-methylated and mono-carbamoylated), they are identical to those of the wild-type strain.
		HDs with 02 MB and 8 MB memory cache...
		Discovery as to soundfont cache problem on Audigy
	www.techspot.com /vb/topic16658.html (581 words)

	CPU decoder ring - The Tech Report (Site not responding. Last check: 2007-09-30)
		At first, you could sort of crib up a cheat sheet by starting with 1533MHz for the 1800+, then adding 66MHz for every additional 100 in the model number.
		Pretty soon, however, there were multiple chips with the same model number that differed in clock speed, cache size, and bus speed.
		Today, AMD and Intel have abandoned clock speed entirely on some chips in favor of three-digit model number systems that are more or less arbitrary.
	techreport.com /cpu/index.x?sort=l1cache (474 words)

	Hardware Analysis - Forum - AMD CPU GUILD Update
		AMD Athlon 64 3000+ (socket 939) 90nm - SOI - L1 cache 128k - L2 cache 512k @ 1.80GHz (Venice) w/ DSL Technology and SSE3
		AMD Athlon 64 3200+ (socket 939) 90nm - SOI - L1 cache 128k - L2 cache 512k @ 2.00GHz (Venice) w/ DSL Technology and SSE3
		AMD Athlon 64 3500+ (socket 939) 90nm - SOI - L1 cache 128k - L2 cache 512k @ 2.20GHz (Venice) w/ DSL Technology and SSE3
	www.hardwareanalysis.com /content/topic/43619 (1099 words)

	Processing L1 cache actions (Site not responding. Last check: 2007-09-30)
		Next: Handling REQUEST type Up: Cache Hierarchy Previous: Processing the cache pipelines
		processes messages that have reached the head of the L1 cache pipeline.
		The following sections describe the manner in which each type of message is processed.
	rsim.cs.uiuc.edu /rsim/Manual/node102.html (47 words)

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