LongHaul

LongHaul

VIA LongHaul is a CPU speed throttling and power saving technology developed by VIA Technologies. By executing specialized instructions, software can exercise fine control on the bus-to-core frequency ratio and CPU core voltage. When the system first boots, the ratio and voltage are set to hardware defaults. While the operating system runs, a "CPU driver" controls the throttling according to how much load is put on the CPU.

This fine control over the CPU's operating parameters brings LongHaul in contrast to other competing technologies, where a CPU is typically allowed to switch between only two states - one that is fast but power-consuming and one that is slow but uses less power. However LongHaul is considered similar to Transmeta's LongRun technology.

There are 3 versions of LongHaul:
* Version 1 only supports dynamic frequency scaling and is implemented in the Cyrix III Samuel (C5A) core and C3 Samuel 2 (C5B) stepping 0 core.
* Version 2 adds voltage scaling and is implemented in the C3 Samuel 2 (C5B) stepping 1-7 and Ezra (C5C) cores.
* Version 3 was renamed to PowerSaver and is implemented in the C3 Ezra-T (C5N) and Nehemiah cores as well as the C7 Esther (C5J) core. Some variants of the C7-D do not support PowerSaver.

Processors supporting LongHaul

* Cyrix III - some models [http://www.cpuscorecard.com/cpuprices/vc3.htm]
* VIA C3
* VIA C7 (PowerSaver)
* VIA Nano (PowerSaver)

External links

* [http://www.via.com.tw/download/mainboards/6/13/VIA_C3_EBGA%20datasheet110.pdf VIA C3 in EBGA Datasheet]
* [http://www.halfhill.com/terms.html Tom's Computer Dictionary] - "LongHaul" entry


Wikimedia Foundation. 2010.

Игры ⚽ Нужно сделать НИР?

Look at other dictionaries:

  • longhaul — long haul n. 1. A long distance: It is a long haul from New York to Los Angeles. 2. A long period of time: Over the long haul the candidates performed well.   longʹ haulʹ (lôngʹhôlʹ, lŏngʹ ) adj. * * * …   Universalium

  • JetConnect — Infobox Airline airline = Jetconnect logo size = 250 fleet size = 8 destinations = 5 domestic 3 international IATA = QF ICAO = QNZ callsign = QANTAS parent = Qantas Airways Limited company slogan = founded = 2002 headquarters = Auckland, New… …   Wikipedia

  • Tomas Andersson — Infobox Musical artist Name = Tomas Andersson Img capt = Img size = Background = non vocal instrumentalist Origin = Stockholm, Sweden Genre = Electronica Occupation = Musician, DJ Years active = 1999–present Label = Average (1999–present) Inkfish …   Wikipedia

  • EDEN ESP — VIA Technologies bezeichnet mit VIA Eden eine Serie von PC Prozessoren, die passiv gekühlt werden und auf einer x86 Architektur aufbauen. Dabei wird zwischen VIA Eden ESP, VIA Eden N, VIA Eden ULV und VIA Eden unterschieden. Die Unterschiede sind …   Deutsch Wikipedia

  • VIA Eden — VIA Technologies bezeichnet mit VIA Eden eine Serie von PC Prozessoren, die passiv gekühlt werden und auf einer x86 Architektur aufbauen. Dabei wird zwischen VIA Eden ESP, VIA Eden N, VIA Eden ULV und VIA Eden unterschieden. Die Unterschiede sind …   Deutsch Wikipedia

  • Condor Flugdienst — This article incorporates information from the equivalent article on the German Wikipedia. Condor …   Wikipedia

  • KLM — Infobox Airline airline = KLM Royal Dutch Airlines Koninklijke Luchtvaart Maatschappij logo size = 200 fleet size = 163 (+70 orders) including KLM Asia destinations = 177 IATA = KL ICAO = KLM callsign = KLM parent = Air France KLM company slogan …   Wikipedia

  • Scape One — Inappropriate tone|date=December 2007Scape One (full name Kurt William Baggaley, born April 20, 1967) is an electro producer and recording artist from the South Coast of England, one of the most prolific producers of the underground UK Electro… …   Wikipedia

  • Organized Crime Agency of British Columbia — Abbreviation OCABC OCABC Logo …   Wikipedia

  • Decepticons — Saltar a navegación, búsqueda Decepticons son en la serie animada Transformers, la raza de robots que juega el rol de villanos. Dirigidos por su líder Megatron, y posteriormente por Galvatron, buscan acrecentar su dominio sobre el Universo y por… …   Wikipedia Español

Share the article and excerpts

Direct link
… Do a right-click on the link above
and select “Copy Link”