Wikipedia

Loongson

Loongson(simplified Chinese:Long tâm;traditional Chinese:Long tâm;pinyin:Lóngxīn;lit.'Dragon Core')[1]is the name of a family of general-purpose,MIPS architecture-compatible, later in-house LoongArch architecturemicroprocessors,as well as the name of the Chinesefablesscompany (Loongson Technology) that develops them. The processors are alternately calledGodsonprocessors,[2]which is described as its academic name.[3]

Loongson Technology Corporation Limited
Native name
Long tâm trung khoa học kỹ thuật thuật công ty hữu hạn
Company typePublic,Mixed ownership enterprise
SSE:688047
IndustrySemiconductor technology industry
FoundedApril 2010;14 years ago(2010-04)
FounderHu Weiwu[zh]
HeadquartersPeople's Republic of China
Loongson Industrial Park, Building 2, Zhongguancun Environmental protection park, Haidian District, Beijing, China
Area served
Global
Key people
Hu Weiwu
(Chairman)
ServicesChip design, motherboard design, operating system and kernel maintenance, important software and library maintenance
Number of employees
More than 400 (estimate)
Websitewww.loongson.cnEdit this at Wikidata
Loongson
General information
Marketed byLoongson Technology,Jiangsu Lemote Tech Co., Ltd,Dawning Information Industry,and others
Designed byInstitute of Computing Technology (ICT),Chinese Academy of Sciences,Loongson Technology,Jiangsu Lemote Tech Co., Ltd
Common manufacturer
Performance
Max.CPUclock rate800 MHz to 2.0 GHz
HyperTransportspeeds800 MHz to 3.0 GHz
Architecture and classification
ApplicationDesktop, Server,Supercomputer,Industrial Device, Embedded Device, Aerospace
Technology node180 nm to 12 nm
Microarchitecturesee text
Instruction set
  • MIPS64(with LoongISA extensions)
  • LoongArch
Physical specifications
Cores
  • 1–8

History

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TheGodsonprocessors, based onMIPS architecture,were initially developed at theInstitute of Computing Technology(ICT),Chinese Academy of Sciences(CAS).[4]The chief architect wasHu Weiwu[zh].[5]The development of the first Loongson chip was started in 2001.[5][6]The aim of the Godson project was to develop "high performance general-purpose microprocessors in China",[2]and to become technologically self-sufficient as part of theMade in China 2025plan.[5]The development was supported by funding via theChinese Communist Party's10thand11th Five-Year Plans.[7][8]

In 2010 the company was commercialized as a separate entity,[5]and in April 2010Loongson Technology Corporation Limitedwas formally established and settled inZhongguancun,Beijing,China.[citation needed]The company is apublic–private partnershipbetween ICT and Beijing-based chip designer BLX IC Design Corporation.[6]BLXitself was a spin-off from ICT, and was founded in 2002 with Jiangsu Zhongyi Group. As Loongson is afablessdesigner, at least some processors were fabricated and marketed bySTMicroelectronics.[6][5]

TheSouth China Morning Postreported that since 2020 Loongson has been partnering with UnionTech andSunwayto develop and promote theDebian-Linux-basedDeepinoperating system in order to reduce China's dependency onMicrosoft Windows.[9][10]

In 2021, Loongson filed for aninitial public offeringon theShanghai Stock Exchange STAR Market.[5][11]The company was seeking to raise US$500 million.[11]Details from this IPO suggested Loongson had needed RMB 400 million annual funding in its first 10 years of existence and that the company had only broken even in 2015.[12]

In April 2024 Loongson processors got a large boost when a school district in the city ofHebicommenced a trial of 10,000 PCs powered by computers featuring theLoongson 3A5000processor and theDeepin-basedUnity Operating System.[13][14]According toThe Register,this trial project is to be used to promote the use of Loongson-and-Linux computers within the Chinese school system, which could potentially result in 50 million Loongson-based computers being sold to Chinese schools every year until 2030.[13]

U.S. sanctions

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Further information:United States sanctions against ChinaandMilitary-civil fusion

In March 2023, theUnited States Department of Commerceadded Loongson to theBureau of Industry and Security'sEntity Listfor acquisition of American technology to support thePeople's Liberation Army(PLA).[15][16]

Instruction set architectures

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MIPS

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Loongson began by using theMIPS64instruction set architecture(ISA). The internalmicroarchitecturewas independently developed byICT.[citation needed]Early implementations of the family lacked four instructions patented byMIPS Technologies(US4814976A, unaligned load-store) to avoid legal issues.[17][18]

In 2007, a deal was reached by MIPS Technologies and ICT. STMicroelectronics bought a MIPS license for Loongson, and thus the processor can be promoted asMIPS-basedorMIPS-compatibleinstead ofMIPS-like.[19][20][21]

In June 2009, ICT licensed the MIPS32 and MIPS64 architectures directly fromMIPS Technologies.[22]

In August 2011, Loongson Technology Corp. Ltd. licensed the MIPS32 and MIPS64 architectures from MIPS Technologies, Inc. for continued development of MIPS-based Loongson CPU cores.[23][24]

In January 2024, Loongson won a case over rights to use MIPS architecture.[25]

LoongISA

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The Loongson 3A2000 in 2015 saw the adoption ofLoongISA1.0, an expanded instruction set that is a superset of MIPS64 release 2.[26][8]It can be broken down into:

  • LoongEXT, general-purpose extensions, 148 instructions
  • LoongVZ, virtualisation extensions to the "VZ" system introduced in MIPS64 release 5, 5 instructions
  • LoongBT, faster x86 andARMbinary translation, 213 instructions
  • LoongSIMD, formerly LoongMMI (in Loongson 2E/F), for 128-bit SIMD, 1014 instructions
  • MIPS SIMD Architecture (MSA), DSP, and VZ modules from MIPS Release 5

The LoongISA instructions were introduced as part of the GS464E cores.[8]The binary translation instructions have the specific benefit of speeding upIntel x86CPU emulation at a cost of 5% of the totaldiearea. The new instructions help aQEMUhypervisor translate instructions from x86 to MIPS with only a reported 30% performance penalty.[27][28]

LoongArch

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Loongson moved to their own processorinstruction set architecture(ISA) in 2021 with the release of the Loongson 3 5000 series.[29][30]A Loongson developer described it as "...a newRISCISA, which is a bit like MIPS orRISC-V.LoongArch includes a reduced 32-bit version (LA32R), a standard 32-bit version (LA32S) and a 64-bit version (LA64) ".[31]The stated rationale was to make Loongson and China not dependent on foreign technology or authorisation to develop their processor capability, whilst not infringing on any technology patents.[32]

The ISA has been referred to as "a fork of MIPS64r6" due to a perceived lack of changes judging from instruction listings.[33][34]The Registerreported in November 2021 that LoongArch might combine the best parts of MIPS and RISC-V, along with custom instructions.[35]

Cores

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Loongson has three main families of processor cores, some of which are available asIP cores:[36]

  • GS464 series: MIPS64 core with four-waysuperscalarout-of-order issue.[37]The design originated from the Loongson 2F processor.[8]It was first widely used in the Loongson 3A processor, before also being used in the Loongson 2 series.[37][38]
    • GS464V was first introduced in 2010 with the Godson 3B, and is a GS464 with vector capabilities.[7][39]
    • GS464E is an improved version of the GS464.[40]Development had started in 2012 after shortcomings were found in the GS464 processor.[8]The core has multiple improvements, including larger caches and better branch prediction amongst others, and was better optimised.[8]The core was extended to support LoongISA (extending the MIPS64 R2 architecture).[40]
    • GS464EV is a development of the GS464 series, first used by the 3A4000 processor[41]
    • LA464 is the development of the GS464 to support LoongArch. Whilst the initial core of the 3A5000 was noted to be GS464, due to incompatible instruction sets Loongson renamed the 3A5000 core to LA464 in their documentation in August 2021.[42]
    • LA664 is the architecture for the 3A6000 series processors.

It has been noted by the community that the naming of the Loongson microarchitectures is not consistent, with different products being noted to have the same processor core, even though the instructions sets might not be exactly compatible.[42]

Processor families

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Loongson has built 3 processor families from their architectural cores.[28]These are the:[28]

  • Godson-1, for consumer electronics and embedded applications
  • Godson-2, single core processors for embedded applications and low performance personal computers[note 1]
  • Godson-3, multi-core processors for higher performance computers, high-performance computing and servers[note 2]

Godson-1

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The first Loongson processor, the Godson-1, was designed in 2001, released in 2002, and is a32-bitCPU running at a clock speed of 266MHz.[6][3][28]It is fabricated with0.18 micron CMOS process,has 8 KB of data cache, 8 KB of instruction cache and a 64-bit floating-point unit, capable of 200 double-precision MFLOPS.[43]Godson-1 series chips either use the GS132 or GS232 cores.[44]

Loongson X is a radiation hardened version of the GS232 core used in the Godson-1.[8]

Godson-2 / Loongson 2

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Loongson 2F CPU fromSTMicroelectronicsin aGdiumlaptop

The Loongson 2 is a family of MIPS III compatible processors.[45][3]It adds 64-bit ability to the Loongson architecture.[6][28]Later Loongson 2 processors migrated to being MIPS64 compatible, due to sharing the GS464 core with the Loongson 3 series.[8]

The development plan for the Godson-2 was to develop it from a CPU to a SOC.[3][7]The 2E (2006) was a CPU, the 2F (2007) integrated the north bridge, the 2G (2008) had a hyper transport link between the CPU/north bridge and an integrated GPU/south bridge, and the 2H (2009) integrated all these functions into a SOC.[3][7]The design of the 2F was the basis of the GS464 core.[8]The 2G uses a single GS464 core;[7]the 2H uses the GS464V core, as a single-core version of the initial Godson 3B.[39]

Godson 3 / Loongson 3 MIPS processors

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Loongson 3B1500E CPU
Lemote-A1310mini-ITXmotherboard(with Loongson 3B1500E)
Loongson 3A3000 CPU

The Loongson 3 family of processors are "...multi-core CPU[s] designed for high performance desktops, servers and clusters".[46][28]They were designed as the first Loongson processors that had multiple cores.[37]The processors were initially designed to use LoongISA - i.e. the MIPS64 release 2 ISA with additional extensions.[37]The designers also attempted to optimise x86 translation on the chip.[3]

1000 series

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The first production processor was the Loongson 3A, which used 4 GS464 cores.[37][27]

The designers noted that they would produce a 3B chip with enhanced processing and vector capabilities, with 8 cores, and a 3C for server applications with up to 16 cores.[7][28]The 8-core Loongson 3B was noted to use the upgraded GS464V core, with extended vector capabilities.[39]This was followed by the Loonson 3C which used 16 GS464V cores.[39]

The 3B1000, and related 2I, both failed as processors due to design errors.[26]In May 2013 development of the 3C was suspended, in favour of developing the 3A2000 processor.[26]

1500 and 2000 series

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In 2015, the 3A1500 and 3B2000 were released using the enhanced GS464E cores.[8]The improved microarchitecture core allowed better performance, reportedly 3 times as fast as the 3A1000, as well as introducing the LoongISA enhanced instruction set.[8]The 3A1500 was for embedded applications, whilst the 3B2000 was for servers and PCs.[8]

3000 series

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In 2017, Loongson released the 3A3000. The performance of the 3A3000 is reported to be equivalent to theIntel J1900processor (released in 2013).[41]

4000 series

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In late-2019 the 3A and 3B 4000 series were released. They used the upgraded GS464EV microarchitecture.[41]

Loongson 3 LoongArch processors

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5000 series, transition to LoongArch

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In July 2021 the Loongson 3 5000 series was released.[30]The processor series was Loongson's first with their own developedinstruction set architecture(ISA), called "LoongArch".[30]The processors announced included the 3A5000, a four-core desktop CPU, and the 3C5000L, a sixteen-core server CPU based on four 3A5000 in a single package.[33][29][35]Both CPUs were reported to be fabricated on a 12 nm process. Whilst the processor was noted to be using the GS464V cores initially, due to incompatibility with previous versions, the cores were renamed to LA464 in August 2021.[42]

The Registerreported that "the 3A5000 is said to be 50% faster and 30% more power efficient" than the preceding 3A4000.[35]Phoronixreported that the 3A5000 CPU was "roughly on a par with the likes of the IntelCore i3 8109U/Core 2 Quad Q9500/Core i5 750(roughly the state of the art in 2008), or Armv8-basedPhytium FT-2000".[30]

In April 2023, Loongson launched the 3D5000 processor for data centers and cloud computing, based on the LoongArch instruction set architecture.[47]

6000 series

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Loongson 3A6000 CPU

In 2022 Loongson announced their 6000 series processors.[48]The company said that the updated processor architecture would use new "LA664" cores[48]and that the single-core performance would rival that of AMD'sZen 3and Intel'sTiger Lake(11th-generation Core) architecture (launched in 2020).[48]

In November 2023 Loongson debuted the 3A6000 processor.[49]The processor is fabricated using a 14nm or 12nm process and supports the fairly old DDR4 standard for memory.[50]The Registerreported that Loongson had demonstrated benchmarks suggesting that the 3A6000 processor was competitive with an Intel 10th-generation Core processor (launched in 2019).[49]

According to reports, Loongson's 3C6000 was to become available in the fourth quarter of 2024.[51]The CPU is a monolithic chip with 16 cores; it features the LA664 proprietary MIPS-derived microarchitecture supporting simultaneous multithreading technology (SMT).[51]The 3C6000 processor features four DDR4-3200 memory interfaces. According to reports, the CPU's performance supposedly compares to that ofIntel's 16-core Xeon Silver 4314 processor, which was released in the second quarter of 2021.[51]

7000 series

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In 2024, Loongson reportedly began its transition to the 7nm process, which was said to potentially provide a 20% to 30% increase in performance to the 3A7000 CPU.[52]The 7nm chips, which could go on sale in 2025, will probably be produced entirely in China, due to US sanctions.[52]

Supported software

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Operating systems

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See also:Comparison of Linux distributions § Instruction set architecture support

The Loongson processors are mainly designed around using theLinuxoperating system.[53]Any operating system supporting theMIPS architectureshould theoretically work.Windows CEwas ported to a Loongson-based system with minimal effort.[54]In 2010, Lemote ported anAndroiddistribution to the Loongson platform.[55]

Loongson machines are used in the package-building and CI infrastructure ofDebianandGolang,respectively. This is partially because of Loongson's status as the only vendor producing application-grade MIPS CPUs for retail.[56]

As of February 2022, there are at least four Chinese Linux distributions that support LoongArch:Kylin,Loongnix,Deepin[57]andUnity Operating System.There are efforts to build LoongArch support into community versions of Linux.[42]

Since 2022,OpenHarmony,a Chinese operating system similar toAndroid,supports LoongArch.[58]

Compiler support

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TheGNU Compiler Collection(GCC) is the main compiler for software development on the Loongson platform.[59][60]

Before 2021LLVMsupport was still inadequate due to missing workarounds for Loongson'sCPU errataon MIPS.[61][42]

ICT also portedOpen64to the Loongson II platform.[62]

LoongArch is supported by the GCC, LLVM,Golangcompilers, and supports theJava,JavaScriptand.NETvirtual machines.[63]

Loongson microprocessor specifications

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Series Model Frequency
(MHz) 		Architecture
 MicroArchitecture Year Cores Process
(nm) 		Transistor
(million) 		Die Size
(mm²) 		Power
(W) 		Voltage
(V) 		Cache(KiB) Peak Floating Point Performance
(GFLOPS) 		Performance
int/fp [SPEC2000] (SPEC2006) 		Remarks
L1(Single Core) L2 L3
Data instruction
Godson 1 266 MIPS-II 32-bit — 2001 1 180 22 71.4 1.0 Un­known 8 8 — — 0.6 [19/25] [64]
FCR_SOC 266 MIPS-II 32-bit — 2007 1 180 Un­known Un­known Un­known Un­known 8 8 — — 0.6 Un­known [65][66]
2B 250 MIPS-III 64-bit — 2003 1 180 Un­known Un­known Un­known Un­known 32 32 — — Un­known [52/58]
2C 450 MIPS-III 64-bit — 2004 1 180 13.5 41.5 Un­known Un­known 64 64 — — Un­known [159/114]
2E 1000 MIPS-III 64-bit GS464 (r1)(Prototype) 2006 1 90 47 36 7 1.2 64 64 512 — Un­known [503/503]
Loongson 1 1A 300 MIPS32 GS232 2010 1 130 22 71.4 1.0 Un­known 16 16 — — 0.6 Un­known [36]
1B 266 MIPS32 GS232 2010 1 130 13.3 28 0.6 Un­known 8 8 — — Un­known Un­known [36]
1C 300 MIPS32 GS232 2013 1 130 11.1 28.3 0.5 Un­known 16 16 — — Un­known Un­known [36]
1C101 8 MIPS32 GS132R 2018 1 130 Un­known Un­known Un­known Un­known — — — — Un­known Un­known [36]
1D 8 MIPS32 GS132 2014 1 130 1 6 3 × 10−5 Un­known — — — — Un­known Un­known [36]
Loongson 2 2F 1200 MIPS-III 64-bit GS464 (r1) 2007 1 90 51 43 5 1.2 64 64 512 — 3.2 Un­known [36]
2G 1000 MIPS64 GS464 (r2) 2012 1 65 Un­known Un­known Un­known 1.15 64 64 4096 — Un­known Un­known [67]
2GP 800 MIPS64 GS464 (r2) 2013 1 65 82 65.7 8 1.15 64 64 1024 — 3.2 Un­known
2I
2H 1000 MIPS64 GS464 (r2) 2012 1 65 152 117 5 1.15 64 64 512 — 4 Un­known
2K1000 1000 MIPS64 Release 2 LoongISA 1.0 GS264E 2017 2 40 1900 79 5 1.1 32 32 256 × 2 1024 8 Un­known [36]
Loongson３ 3A1000 1000 MIPS64 Release 2

LoongISA 1.0

GS464 (r2) 2009 4 65 425 174.5 10 1.15 64 64 256 × 4 — 16 [568/788], (2.4/2.3) [36]
3B1000 1000 MIPS64 Release2

LoongISA 1.0

GS464 (r2) 2010 4+4 65 ＞ 600 Un­known 20 1.15 64 64 128 × 8 — Un­known Un­known [68]
3B1500 1200–1500 MIPS64 Release 2

LoongISA 1.0

GS464V 2012 4+4 32 1140 142.5 30(typical)
60(vector) 		1.15–1.35 64 64 128 × 8 8192 150 Un­known [36][69]
3A1500-I 800–1000 MIPS64 Release2

LoongISA 1.0

GS464E 2015 4 40 621 202.3 15 1.15–1.25 64 64 256 × 4 4096 16 (6/??) [36]
3A2000
3B2000
3A3000 1500 MIPS64 Release 2

LoongISA 1.0

GS464E 2016 4 28 ＞ 1200 155.78 30 1.15–1.25 64 64 256 × 4 8192 24 [1100/1700], (11/10)@Single (36/33)@Rate [36]
3B3000 GS464E
3A4000 1800-2000 MIPS64 Release 5

LoongISA 2.0

GS464EV(GS464v) 2019 4 28 ? ? <30 [email protected] GHz

<40 [email protected] GHz

<50 [email protected] GHz[36]

0.95-1.25 64 64 256 x 4 8192 128 (21.1/21.2)@Single (61.7/58.1)@Rate
3B4000
3A5000 3B5000 2300-2500 LoongArch GS464V 2021 4 12 / 14 35w @ 2.5 GHz 64 64 256x4 16384 160 (26.6*/??)@Single, (80*/??)@Rate *SpecInt Base point [36]
3C5000L 2200 LoongArch GS464V 2021 16 12 / 14 150w @ 2.2 GHz 64 64 256x16 16384x4 560 Unknown [36]
3C5000L-LL 2000 LoongArch GS464V 2021 16 12 / 14 125w @ 2.0 GHz 64 64 256x16 16384x4 512 Unknown [citation needed]
3A6000 2000-2500 LoongArch LA664 2023 4 12 38w @ 2.5 GHz 64 64 256x4 16384 [49][70]
3C6000 1800-2300 LoongArch LA664 2024 16 12 32768 [71]
3D6000 1600-2100 LoongArch LA664 2024 32 12 65536 [71]
3E6000 LoongArch LA664 2024 64 12 131072 [71]
3B6600 3000 LoongArch LA864 + LG200 2025 8 7 16384 [72][73]
3A7000 LoongArch LA864 2025 8 7 16384 [74]
3B7000 3500 LoongArch LA864 2025 16 7 32768 [72][73]
3C7000 LoongArch LA864 2025 16 7 32768 [74]
3D7000 LoongArch LA864 2025 32 7 65536 [74]
3E7000 LoongArch LA864 2025 64 7 131072 [74]


Loongson-based systems

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Lemote FuLoong and YeeLoong with a Loongson 2F microprocessor
Lemote's Fulong MiniPC on top of a CD-ROM drive as reference

In 2012 it was reported that Loongson processors had found itself into very few computing systems.[6]The processors are mainly used in Chinese computers; in 2021 it was reported that Loongson supplies CPUs for most desktop computers procured by the Chinese government, and 80% of the Chinese government's servers.[12]The release of the 3A3000 processor in 2015 was noted as turning point for the company's fortunes.[12]In 2017 it was noted that the company's processors were being used in theBeidousatellite.[12][8]

Personal computers

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In March 2006, a€100 Loongson II computer design calledLongmeng(Dragon Dream) was announced byLemote.[citation needed]

In June 2006 at Computex'2006, YellowSheepRiver announced theMunicator YSR-639,[75]asmall form factorcomputer based on the 400 MHz Loongson 2.

As of November 2008the new 8.9 "netbook from the Chinese manufacturerLemotethat replacedmengloong,Yeeloong(Portable Dragon),[76]runningDebian,is available[77]in Europe from the Dutch companyTekmote Electronics.

In January 2010,Jiangsuprovince planned to buy 1.5 million Loongson PCs.[78]

In September 2011, Lemote announced the Yeeloong-8133 13.3 "laptop featuring 900 MHz, quad-core Loongson-3A/2GQ CPU.[79]

Supercomputers

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On 26 December 2007, China revealed its first Loongson basedsupercomputerinHefei.TheKD-50-Ihas a reported peak performance of 1TFLOPS,and about 350GFLOPSmeasured byLINPACK.[80]This supercomputer was designed by a joint team led byChen Guoliangat the computer science technology department of theUniversity of Science and Technology of China(USTC) and ICT (the secondary contractor). KD-50-I is the first Chinese built supercomputer to utilize domestic Chinese CPUs, with a total of more than 336 Loongson-2F CPUs, and nodes interconnected byethernet.The size of the computer was roughly equivalent to a household refrigerator and the cost was less than RMB800,000 (approximatelyUS$120,000,€80,000).[81]

In 2012 it was reported that Loongson processors were to be found in theSunway BlueLightMPP andDawning 6000supercomputers.[6]

See also

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Notes

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  1. ^The Godson/Loongson 2 series processors have been developed and named mostly sequentially in an Alpha betical format.
  2. ^The Godson/Loongson 3 series processors seem to be named according to segment and then a generation number. The segment tends to be A (general purpose PCs), B (seemingly high core counts) and C (server processors). The generation numbers start at 1000 for the first series processors, and then increment generally to the next thousand. There are some processors that may be between generation products, that have a x5000 designation.

References

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  1. ^"Long tâm xử lý khí tiếng Anh nhãn hiệu định danh Loongson( tổ đồ )_ nghiệp giới _ khoa học kỹ thuật thời đại _ tân lãng võng".tech.sina.cn.Archivedfrom the original on 9 July 2011.Retrieved19 November2006.
  2. ^abHu, Wei-Wu; Zhang, Fu-Xin; Li, Zu-Song (March 2005). "Microarchitecture of the Godson-2 Processor".Journal of Computer Science and Technology.20(2): 243–249.doi:10.1007/s11390-005-0243-6.S2CID27672171.
  3. ^abcdefHu, Weiwu (August 2008)."Micro-architecture of Godson-3 multi-core processor".2008 IEEE Hot Chips 20 Symposium (HCS).pp. 1–31.doi:10.1109/HOTCHIPS.2008.7476554.ISBN978-1-4673-8871-9.S2CID38427069.Archivedfrom the original on 2 August 2021.Retrieved2 August2021.
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  21. ^Godson-3 Emulates x86
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