26 FPGA FPGA (Field Programmable Gate Array) ASIC (Application Specific Integrated Circuit) FPGA FPGA FPGA FPGA Linux FreeDOS skewed way L1
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1 FPGA
2 26 FPGA FPGA (Field Programmable Gate Array) ASIC (Application Specific Integrated Circuit) FPGA FPGA FPGA FPGA Linux FreeDOS skewed way L1 FPGA skewed L2 FPGA skewed Linux skewed
3 skewed FPGA skewed FPGA i
4 FPGA (Field Programmable Gate Array) ASIC (Application Specific Integrated Circuit) FPGA FPGA FPGA FPGA Linux FreeDOS skewed way L1 FPGA skewed L2 Linux 1
5 1.2 2 skewed FPGA
6 IC Intel i4004[1] 2.1 Intel [2] Gulftown Core i7-980x 6 2.1: Intel Pentium 4 core i7-980x (6 ) () kHz 1MHz 10MHz 20MHz 1GHz 3GHz 4.5K 64K 16M 4G 4G 24G 3
7 2.1.2 Core i L1 ( 1) L2 ( 2) [3] Core i7-980x L1 L1 32KBL2 256KB MB L
8 valid valid dirty 5
9 2.1:
10 2.2: n n-way 2 LRU (Least Recently Used) LRU LRU 7
11 2.3: 2.4: n-way 2.3 skewed skewed [4][5] skewed 2-way way A B 2 2-way way skewed 2.6 8
12 d d 2.5: 2-way 2.6: 2-way skewed skewed A B way 2-way skewed skewed 2 n 1 4-way A A A 0 A 3 4 A = {A 3 A 2 A 1 A 0 } A 0 2 A 1 A 2 n A 3 A 1 {A 3 A 2 } skewed A 1 A 2 σϕϕ 0 3 index 0 index 1 index 2 index 3 9
13 index 0 = {ϕ(a 1 ) ϕ (A 2 )} index 1 = {σ(ϕ(a 1 )) ϕ (A 2 )} index 2 = {σ 2 (ϕ(a 1 )) ϕ (A 2 )} index 3 = {σ 3 (ϕ(a 1 )) ϕ (A 2 )} σ ϕ ϕ n ϕ ϕ σ n σ 2 n 2 σ 3 n way A = A 0 A 3 A 0 = {00}A 1 = {1011}A 2 = {0101}A 3 = {101} σ 1 σ 2 2 σ 3 3 ϕ ϕ index 0 index 1 index 2 index 3 index 0 = {A 1 A 2 } = {1110} index 1 = {σ(a 1 ) A 2 } = {0010} index 2 = {σ 2 (A 1 ) A 2 } = {1011} index 3 = {σ 3 (A 1 ) A 2 } = {1000} 4 way skewed 2.4 FPGA [6] ISA x86 OS FPGA Altera DE2-115 FPGA Linux 10
14 2.7: ao486 SoC (Tiny Core 5.3) FreeDOS ao486 SoC x86 OS FPGA ao486[7] ao486 Verilog HDL Intel 80486SX ao486 VGA PS2 ao486 SoC 2.7 ao486 SoC ao486 SoC Terasic Altera DE2-115 FPGA Linux 3.13 Windows ao486 SoC ao486 SoC Altera Nios II Nios II BIOS Nios II BIOS Verilog HDL FPGA
15 2.8: FPGA ao486 16KB I/O DRAMVGAPS/2SD Card 4 PIT (Programmable Interval Timer)RTC (Real Time Clock)PIC (Programmable Interrupt Controller)HDDBIOS loader FPGA HDD SD contoller SD SD OS BIOS BIOS loader SD controller SD BIOS DRAM BIOS loader ao486 reset high BIOS BIOS loader ao486 reset low SD OS OS 2.9 Tiny Core FreeDOS 1.1 DOOM[8] 12
16 2.9: FPGA Linux (Tiny Core 5.3) 2.10: FPGA FreeDOS 1.1 DOOM 13
17 FPGA Cyclone IV EP4CE115F29C7 Altera DE2-115 FPGA [10] Linux (Tiny Core 5.3) SPEC CPU92 [9] C Intel GCC DRAM read write 3.1 sort mm go L1 DRAM read/write L1 read write 14
18 dddl ddl edl yœµµ dl µœ µœ fœe 3.1: 30% FPGA L2 L FPGA L Verilog HDL RAM 3 RAM RAM 15
19 3.1: skewed 1word Direct mapped Direct mapped 1 word 2 14 no 4word Direct mapped Direct mapped 4 word 2 12 no 1word 2-way set associative 2-way set associative 1 word 2 13 no 4word 2-way set associative 2-way set associative 4 word 2 11 no 4word 2-way skewed associative 2-way set associative 4 word 2 11 yes 1word 4-way set associative 4-way set associative 1 word 2 12 no 4word 4-way set associative 4-way set associative 4 word 2 10 no 4word 4-way skewed associative 4-way set associative 4 word 2 10 yes DRAM IDLE read/write IDLE read/write COMP COMP hit/modify/miss 3 hit hit hit read/write 1 IDLE modify modify WB DRAM FETCH 16
20 3.2: L2 miss miss miss miss DRAM FETCH 1word write 32bit writedata 4bit byte enable byte enable 1word 1 2 write 4 write writedata modify miss FETCH IDLE 4word 4 FETCH 4word 4word DRAM 4word DRAM DRAM 4word 1word 17
21 3.3: LRU Control Memory LRU 2-way 4-way LRU LRU 2-way 1bit 4-way 8bit LRU Control Memory LRU Control Memory LRU LRU Control Memory 2bit 0123 bit bit 0 LRU Control Memory {00} 0 LRU Control Memory 2bit 3.3 skewed 4word 2-way 4-way skewed 2.3 A A = {A 3 A 2 A 1 A 0 } index 0 18
22 index 3 index 0 = {ϕ(a 1 ) ϕ (A 2 )} index 1 = {σ(ϕ(a 1 )) ϕ (A 2 )} index 2 = {σ 2 (ϕ(a 1 )) ϕ (A 2 )} index 3 = {σ 3 (ϕ(a 1 )) ϕ (A 2 )} σ 1bit ϕ ϕ 1 σ 2 2bit σ 3 3bit index 1 A 1 index 1 = {σ(a 1 ) A 2 } A 1 = {σ 1 (index 1 A 2 )} {A 3 A 2 } FPGA L2 2.4 FPGA DRAM L2 3.4 SD BIOS DRAM SD controller write read/write L2 3.5 readdata writedata 32bit read/write 1 4 0x00 4 read 0x000x040x08 0x0C 4 read Burst Controller 32bit
23 3.4: L2 FPGA 3.5: L2 L2 64KB Cyclone IV EP4CE115F29C7 Altera DE2-115 FPGA Cyclone IV EP4CE115F29C7 20
24 Cyclone IV EP4CE115F29C7 Altera DE2-115 FPGA 3 FPGA Linux (Tiny Core 5.3) 4.1 Altera DE2-115 FPGA GPIO 34 UART PC PC TeraTerm FPGA read/write # PC # VGA writedata # Xorshift 21
25 4.1: Xorshift 2 12 OS 3 C Intel GCC Tiny Core FPGA Tiny Core Cyclone IV EP4CE115F29C7 ao486 processor LC Util per CPU ao486 processor Logic Cells 64KB 22
26 4.1: cache Logic Cells Memory Bits LC Util per CPU 1word Direct mapped , % 4word Direct mapped , % 1word 2-way set associative , % 4word 2-way set associative , % 4word 2-way skewed associative , % 1word 4-way set associative , % 4word 4-way set associative 1, , % 4word 4-way skewed associative 1, , % ao486 processor 36, , % 2-way 4-way LRU LRU Control Memory skewed skewed read/write 4.2 L2 mm sort go sort&mm mm&go go&sort sort&mm&go 3 2-way 4-way 1word 23
27 ddd dd d dddd d dd dd 4.2: L2 4word skewed skewed 2 3 1word 42.5% 4word 4-way skewed 6.51% 4.4 L2 3 24
28 4.3: L2 4.3 L2 L2 L2 4word 4-way skewed sort word L2 skewed skewed 2-way 4-way 1word 4word 25
29 skewed skewed 2-way 2-way skewed 4-way 4-way skewed 3 1word 171.3(sec) 4word 4-way skewed 136.9(sec) word 4word DRAM read/write 4word 4word DRAM read/write read/write 4word read 4 read 4word 4 read 3 1word 26
30 4.2: app read request write request (million) (million) sort mm go read/write 1word OS read/write 4.2 read/write skewed int xorshift a b b b[0] 0x000 b[1]b[2] b b[0] b[256] 0x400 skewed 27
31 4.4: skewed skewed way skewed 4-way 28
32 ddd ded dd ed d d d d d d d d d d d d d d d 4.5: 3 skewed 4-way 2-way skewed 2-way skewed 4-way 2-way skewed LRU Control Memory 4-way 2-way 29
33 ddd ded dd ed d dd dd 4.6: 2-way skewed 4-way ddd ddd dd dd dd ed ed dd dd 4.7: 2-way skewed 4-way 30
34 5 OS FPGA FPGA Linux skewed skewed 3 4word 4-way skewed 1word 1.25 L skewed FPGA skewed 31
35 Thiem Van Chu 32
36 [1] Intel... [2].. 2,, 2011, 13p [3] David A.Patterson/John L.Hennessy. &.. 4, BP, 2011 [4] André Seznec. A Case for Two-Way Skewed-Associative Caches. ISCA 93 Proceedings of the 20th annual international symposium on computer architecture, pp [5] André Seznec. A New Case for Skewed-Associativity. IRISA-INRIA, Campus de Beaulieu Rennes Cedex, FRANCE, 1997 [6],,,,,. MieruSys FPGA. RECONF CPSY VLD IPSJ-SLDM,, vol. 114, no. 428, RECONF , pp , 2015 [7] ao [8] idsoftware. [9] spec. SPEC CPU92 Benchmarks. Standard Performance Evaluation Corporation. [10] ALTERA. DE2-115 Development and Education Board. 33
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