Dummy FTL. Dong-Yun Computer Systems Laboratory Sungkyunkwan University
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1 Dummy FTL Dong-Yun Computer Systems Laboratory Sungkyunkwan University
2 Troubleshooting Q. Compile errors occured in eabi-related libraries A. Modify all the lines in uart_printf Q. ERROR: cannot open firmware.bin for reading A. You have not done build yet, or build is failed ICE3028: Embedded Systems Design (Spring 2017) Jin-Soo Kim 2
3 Contents Deep dive to the Jasmine & codes Read / write command flow Host interface layer - SATA controller - Buffer manager Flash translation layer Intro. to DummyFTL Request handling in Dummy FTL (code-level) Appendix: Measuring performance with IOmeter ICE3028: Embedded Systems Design (Spring 2017) Jin-Soo Kim (jinsookim@skku.edu) 3
4 Hardware Architecture INDILINX Barefoot TM Clock Generator UART SRAM (96KB) ROM ARM7TDMI-S Core APB Bridge GPIO Timer AHB WDT NAND Buffer Manager SATA Device DRAM Memory Utility PMU ICU DRAM Access Bus JTAG NAND Flash SATA Host interface DRAM JTAG debug port ICE3028: Embedded Systems Design (Spring 2017) Jin-Soo Kim 4
5 Read Command Flow INDILINX Barefoot TM Clock Generator UART SRAM (96KB) ROM ARM7TDMI-S Core APB Bridge GPIO Timer AHB WDT NAND Buffer Manager SATA Device DRAM 2 Memory Utility PMU ICU DRAM Access Bus JTAG 1 NAND Flash SATA Host interface DRAM JTAG debug port ICE3028: Embedded Systems Design (Spring 2017) Jin-Soo Kim (jinsookim@skku.edu) 5
6 Write Command Flow INDILINX Barefoot TM Clock Generator UART SRAM (96KB) ROM ARM7TDMI-S Core APB Bridge GPIO Timer AHB WDT NAND 3 Buffer Manager SATA Device DRAM 1 Memory Utility PMU ICU DRAM Access Bus JTAG 2 NAND Flash SATA Host interface DRAM JTAG debug port ICE3028: Embedded Systems Design (Spring 2017) Jin-Soo Kim (jinsookim@skku.edu) 6
7 SATA SATA event queue 128 slots for SATA command Inserted by ISR Deleted by FTL Queue policy FIFO - Read latency suffers Read first - RAW hazard - History log by H/W Disabled in Jasmine handle_got_cfis() ICE3028: Embedded Systems Design (Spring 2017) Jin-Soo Kim (jinsookim@skku.edu) 7
8 Buffer Manager SATA data is buffered in DRAM Memory map of Jasmine board ICE3028: Embedded Systems Design (Spring 2017) Jin-Soo Kim 8
9 Buffer Manager (cont d) ftl_read_ptr, ftl_write_ptr Transfer data from / to NAND sata_read_ptr / sata_write_ptr Transfer data to / from host Q. Why the order of bm_ptr is different in read and write? ICE3028: Embedded Systems Design (Spring 2017) Jin-Soo Kim (jinsookim@skku.edu) 9
10 Triggering & Initializing FTL./target_spw/init_gnu.s Call init_jasmine() Call Main() init_jasmine() Initialize H/W configurations Main() FTL top level loop./sata/sata_main.c ICE3028: Embedded Systems Design (Spring 2017) Jin-Soo Kim 10
11 Dummy FTL./ftl_dummy ftl.c, ftl.h Dummy FTL is not a real FTL No access to NAND flash Neither stores nor retrives any data Why Dummy FTL? To simply measure the SATA & DRAM speed ICE3028: Embedded Systems Design (Spring 2017) Jin-Soo Kim (jinsookim@skku.edu) 11
12 How to Enable Dummy FTL./build_gnu/Makefile ICE3028: Embedded Systems Design (Spring 2017) Jin-Soo Kim 12
13 Dummy FTL: Read Handling./ftl_dummy/ftl.c ICE3028: Embedded Systems Design (Spring 2017) Jin-Soo Kim 13
14 Dummy FTL: Write Handling./ftl_dummy/ftl.c ICE3028: Embedded Systems Design (Spring 2017) Jin-Soo Kim 14
15 To End up Today Class Q. Why the order of bm_ptr is different in read and write? Q. What is for copy buffer of buffer region in DRAM? (#8 slide) Hint) Answer each question in a single sentence me with your own answers in each group Due: Next lab class ICE3028: Embedded Systems Design (Spring 2017) Jin-Soo Kim (jinsookim@skku.edu) 15
16 Any Questions? ICE3028: Embedded Systems Design (Spring 2017) Jin-Soo Kim 16
17 IOmeter Performance measurement tool for storage Performance factors IOPS (IOs Per Second) Bandwidth (MB/s) Response time (also known as latency) ICE3028: Embedded Systems Design (Spring 2017) Jin-Soo Kim 17
18 Install & Run Iometer Select disk target Example ICE3028: Embedded Systems Design (Spring 2017) Jin-Soo Kim 18
19 Example Make new access specification Access Specifications -> New ICE3028: Embedded Systems Design (Spring 2017) Jin-Soo Kim 19
20 Example Assign access specification Select access specification and Add ICE3028: Embedded Systems Design (Spring 2017) Jin-Soo Kim 20
21 Start Tests Example Results Display -> Click Flag Icon ICE3028: Embedded Systems Design (Spring 2017) Jin-Soo Kim 21
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