1 M32R Single-Chip Multiprocessor [2] [3] [4] [5] Linux/M32R UP(Uni-processor) SMP(Symmetric Multi-processor) MMU CPU nommu Linux/M32R Linux/M32R 2. M

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1 M32R Linux SMP a) Implementation of Linux SMP kernel for M32R multiprocessor Hayato FUJIWARA a), Hitoshi YAMAMOTO, Hirokazu TAKATA, Kei SAKAMOTO, Mamoru SAKUGAWA, and Hiroyuki KONDO CPU OS 32 RISC M32R Linux Linux/M32R Linux/M32R Linux/M32R M32R Linux SMP Linux 1. Renesas Technology Corp. Mitsubishi Electric Corp. a) 32 RISC M32R [1] M32R OS Linux OS 2000 M32R Linux Linux/M32R GNU

2 1 M32R Single-Chip Multiprocessor [2] [3] [4] [5] Linux/M32R UP(Uni-processor) SMP(Symmetric Multi-processor) MMU CPU nommu Linux/M32R Linux/M32R 2. M32R 2. 1 M32R LSI SoC(System on a Chip) LSI LSI, M32R LSI 32 RISC Verilog-HDL M32R VDEC [6] M32R 2 CPU I/O CPU 2 CPU CPU CPU CPU Modified ( ) Exclusive ( ) Shared ( ) Invalid ( ) 4 MESI I/O CPU CPU CPU IPI: InterProcessor Interrupt 2

3 LOCK UNLOCK I/O CPU 3. Linux/M32R OS OS Linux 2. 2 Linux SMP Linux/M32R [4] Linux MP(Multi-processor) UP(Uniprocessor) MP M32R LOCK/UNLOCK LOCK UNLOCK LOCK UNLOCK CPU LOCK LOCK UNLOCK lock lock Linux/M32R 1 : mvfc r5, psw c l r p s w #0x40 # d i s a b l e i n t. l o c k # \ addi r4, # 1 # atomic op. unlock # / mvtc r5, psw beqz r4, 3 f 2 : l d # busy l o o p b l e z r4, 2 b # bra 1b 3 : 1 lock 1 : mvfc r5, psw c l r p s w #0x40 # d i s a b l e i n t. l o c k # \ addi r4, # 1 # atomic op. unlock # / mvtc r5, psw bnez r4, 2 f. s u b s e c t i o n 1. t e x t. l o c k 2 : l d # busy l o o p b l e z r4, 2 b # bra 1b. p r e v i o u s 2 lock Linux r0 1 2 LMbench Local Communication latencies 10% MP M32R 3

4 (LOCK/UNLOCK) CPU CPU CPU CPU Linux/M32R CPU IPI CPU CPU TLB CPU IPI 1 IPI M32R CPU 1 CPU BSP: BootStrap Processor BSP CPU AP: Application Processor 1 BSP 2 BSP Linux 3 BSP AP IPI 4 AP cpu idle 4. Linux/M32R Linux M32R Linux Preemptible kernel 2.6 nommu MMU CPU Linux M32R Linux/M32R Web 2 M32R deb apt-get 5. Linux M32R Linux/M32R Linux/M32R Mappi Maker: CPU: M32R (M32700) 400MHz single-chip-multiprocessor SDRAM: 64MB FLASH: 4MB LAN: 10Base-T PCMCIA slot, Display I/F (VGA) Size: 145 mm x 135 mm Photo: 2 Mappi-II Maker: CPU: M32R FPGA: CPU/MMU/ / IO SDRAM: 64MB FLASH: 4MB LAN: 100Base-TX USB: Host2.0 CF/MMC/MS slot, IDE, PC/104 Size: 160mm x 120mm Photo: /04/

5 図2 Mappi 図 4 M3T-M32700UT 図 5 OAKS32R 表1 図 3 Mappi-II M3T-M32700UT Maker: ルネサステクノロジ CPU: M32R (M32700) 400MHz single-chip-multiprocessor SDRAM: 32MB FLASH: 4MB LAN: 100Base-TX USB:Host2.0 CF/MMC/eTRON slot, LCD, AR カメラ Size: 60mm x 85mm Photo: 図 4 OAKS32R Maker: オークス電子 CPU: M32R (M32102) 66MHz w/o MMU SDRAM: 8MB FLASH: 2MB LAN: 10Base-T Size: 60mm x 105mm Photo: 図 5 CPU CPU clk. BUS Cache SDRAM File System Tool 測定環境 Mappi M32R (M32700) 200MHz 32bit 100Mz I8KB+D8KB 64MB NFS GCC 性 能 評 価 マルチプロセッサ対応 Linux/M32R の評価を行 なった 評価には LMbench [8] と NPB: NAS Paral- lel Benchmark [9] を用いた 測定は 5. で述べた Mappi を用いて実行した このスペックを表 1 に示す 6. 1 LMbench LMbench の測定を カーネル , それぞ れ UP, SMP で行なった 以上のプラットフォームのうち Mappi, Mappi-II, LMbench は Larry McVoy 氏らによって作成され M3T-M32700UT はマルチプロセッサでの動作が可 た OS ハードウェアの基本的な性能を測定するシン 能である また OAKS32R [7] が搭載する M32102 プルでポータブルなベンチマークスイートである こ は MMU を持たない CPU であるが nommu 版の のベンチマークスイートでは以下の項目の性能を測定 Linux-2.6 が動作可能である することができる 5

6 time [ms] null call null I/O time [ms] UDP latency TCP latency SMP 2.4 UP 2.6 SMP 2.6 UP SMP 2.4 UP 2.6 SMP 2.6 UP 6 LMbench null call, null I/O 7 LMbench TCP,UDP latency Bandwidth benchmarks Latency benchmarks Miscellaneous TLB LMbench (α ) 3.0-a a3 α 3.0-a3 LMbench 3.0-a3 null call, null I/O, TCP latency, UDP latency 6 7 UP SMP SMP UP 10% 20% i386 SMP M32R SMP NAS Parallel Benchmark NPB CLASS S Speed-up factor # of proc. 8 NPB Class S IS MG LU CG SP BT EP Fortran90 FT EP, MG, CG, IS, LU, SP, BT CLASS S NPB: NAS Parallel Benchmarks [9] NASA Ames Research Center NPB () NPB EP: MG: CG: FT: FFT IS: LU: Symmetric SOR iteration CFD SP: Scalar ADI iteration CFD BT: 5x5 block size ADI iteration CFD 6

7 2 NPB Class S Time in seconds = # of proc. IS MG LU CG SP BT EP Mop/s total = # of proc. IS MG LU CG SP BT EP Speed-up factor = # of proc. IS MG LU CG SP BT EP CLASS S, W, A, B, C CLASS S 2 Speedup Factor 8 () Speed-up Factor(1 ) 2 Speed-up Factor Linux/M32R M32R Linux SMP Linux SMP LMbench NPB SMP Linux/M32R Linux/M32R (NEDO) [1] Satoshi Kaneko, et al.: A 600 MHz single-chip multiprocessor with 4.8 GB/s internal shared pipelined bus and 512 kb internal memory, ISSCC Digest of Technical Papers, pp (2003). [2],,,,,, Linux M32R, Linux Conference 2002 (2002). [3] Linux/M32R Home Page. [4], Linux, 66, 1, pp. 78 (2004). [5] Hirokazu Takata, Naoto Sugai, Hitoshi Yamamoto Porting Linux to the M32R processor, Ottawa Linux Symposium (2003). [6] (VDEC) ( ) M32R. [7] OAKS32R. [8] Larry McVoy and Carl Staelin: LMbench - Tools for Performance Analysis. [9] NASA Ames Research Center: The NAS Parallel Benchmarks. 7

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