ysoh's technical blog http://ysohtech.cafe24.com Tue, 28 Jul 2009 13:55:31 +0000 http://wordpress.org/?v=2.7.1 en hourly 1 Energy Efficient Prefetching and Caching http://ysohtech.cafe24.com/2009/07/09/energy-efficient-prefetching-and-caching/ http://ysohtech.cafe24.com/2009/07/09/energy-efficient-prefetching-and-caching/#comments Thu, 09 Jul 2009 01:30:36 +0000 admin http://ysohtech.cafe24.com/?p=117 http://www.cs.rochester.edu/u/papathan/papers/2004-usenix04/papathan-usenix04.pdf

http://www.cs.rochester.edu/u/papathan/research/BurstyFS/

]]> http://ysohtech.cafe24.com/2009/07/09/energy-efficient-prefetching-and-caching/feed/ File And Storage Conference Calendar http://ysohtech.cafe24.com/2009/05/11/file-and-storage-conference-calendar/ http://ysohtech.cafe24.com/2009/05/11/file-and-storage-conference-calendar/#comments Sun, 10 May 2009 16:16:16 +0000 admin http://ysohtech.cafe24.com/?p=97

]]> http://ysohtech.cafe24.com/2009/05/11/file-and-storage-conference-calendar/feed/ FlexFS: A Flexible Flash File System for MLC NAND Flash Memory, http://ysohtech.cafe24.com/2009/05/10/flexfs-a-flexible-flash-file-system-for-mlc-nand-flash-memory/ http://ysohtech.cafe24.com/2009/05/10/flexfs-a-flexible-flash-file-system-for-mlc-nand-flash-memory/#comments Sun, 10 May 2009 05:11:22 +0000 admin http://ysohtech.cafe24.com/?p=86 Sungjin Lee, Keonsoo Ha, Kangwon Zhang, Jihong Kim, and Junghwan Kim,

Link ->  FlexFS: A Flexible Flash File System for MLC NAND Flash Memory,

To appear in Proceedings of USENIX Annual Technical Conference (USENIX ATC), San Diego, USA, June 2009.

Flex-OneNAND

what is Flex-OneNAND

what is Flex-OneNAND

benefits of Flex-OneNAND

3-chip MCP Solution 2-chip MCP Solution
memory
combination		 MCU - MLC NAND / NOR SLC NAND / DRAM MCU - Flex-OneNAND / DRAM
target application Ultra High Density Device 512MB ~ 2GB Navi. &
Music Phone, DSC
technical feature comparison

items OneNAND MLC NAND (1) Flex-OneNAND (2)
(MLC Area)		 Flex-OneNAND
(SLC Area)
product
nature		 Bootability YES NO YES
P/E Cycle 100K 5K 10K 50K(TBD)
ECC/EDC 1bit ECC
(2bit EDC)		 N/A 4bits ECC(5bit EDC)
performance Page Size 2KB 4KB 4KB 4KB
Read
Performance		 108MB/s 25MB/s 67MB/s 87MB/s
Write
Performance		 17MB/s 4.4MB/s
(1 plane)
8MB/s(2 plane)		 5MB/s(1 plane) 15MB/s(1 plane)

note :

  • (1) 50nm MLC(No cache), (2) 60nm Flex-OneNAND
merge performance comparison

Time delay of worst case during copy-back operating

worst case : Partially written two blocks are merged onto one free block

Worst Time delay of Flex-OneNAND

Flex-OneNAND feature highlight
cost effective Large Block Structure & MLC based NAND Core
enhanced performance X16 Synchronous Burst Read/Write(66Hz)
Superload/ Cache Program
reliability Embedded automatic 4bit ECC, 5bit EDC
smart security Normal OTP Block(128KB) and User Controlled 128KB OTP Block
(1st Block OTP)
fixed pin count 16 Address Pins Regardless of Density Increase
data protection Three Stages of Data Protection (Lock/Unlock/Lock-Tight)
automatic boot up Internal Boot Loader with 1KB XIP at Power Up
features FBGA(LF)/ Bottom Boot
Multiplexed Interface (Data-Address) available
Operating Voltage 1.8V/ 3.3V
line-up 4Gb, 8Gb(DDP), 16Gb(QDP)

Data Sheet

]]> http://ysohtech.cafe24.com/2009/05/10/flexfs-a-flexible-flash-file-system-for-mlc-nand-flash-memory/feed/ Tolerating File-System Mistakes with EnvyFS http://ysohtech.cafe24.com/2009/05/10/file-system-papers/ http://ysohtech.cafe24.com/2009/05/10/file-system-papers/#comments Sat, 09 May 2009 16:15:44 +0000 admin http://ysohtech.cafe24.com/wordpress/?p=48 Tolerating File-System Mistakes with EnvyFS
Lakshmi N. Bairavasundaram, Swaminathan Sundararaman, Andrea C. Arpaci-Dusseau, Remzi H. Arpaci-Dusseau
To appear in the Proceedings of the Usenix Annual Technical Conference (USENIX ‘09)
San Diego, CA, June 2009.
Available as: Abstract, Postscript, PDF, BibTex

]]> http://ysohtech.cafe24.com/2009/05/10/file-system-papers/feed/ smb.conf http://ysohtech.cafe24.com/2009/05/04/smbconf/ http://ysohtech.cafe24.com/2009/05/04/smbconf/#comments Mon, 04 May 2009 14:37:58 +0000 admin http://ysohtech.cafe24.com/wordpress/?p=37 2846676494.conf5443625557.xxx

]]> http://ysohtech.cafe24.com/2009/05/04/smbconf/feed/ Related Works of LFS about an Implementation http://ysohtech.cafe24.com/2009/04/25/related-works-of-lfs-about-an-implementation/ http://ysohtech.cafe24.com/2009/04/25/related-works-of-lfs-about-an-implementation/#comments Sat, 25 Apr 2009 14:20:32 +0000 admin http://ysohtech.cafe24.com/wordpress/?p=27 - ULFS(User-level Log-structured File System)
  http://ulfs.sf.net

- LinLogFS
  http://www.complang.tuwien.ac.at/czezatke/lfs.html

- NILFS
   http://www.nilfs.org/

- Log-structured file system for Linux 2.6  
   http://aiya.ms.mff.cuni.cz/lfs/

- Wikipedia
  http://en.wikipedia.org/wiki/Log-structured_file_system

]]> http://ysohtech.cafe24.com/2009/04/25/related-works-of-lfs-about-an-implementation/feed/ Palawan http://ysohtech.cafe24.com/2009/04/25/palawan/ http://ysohtech.cafe24.com/2009/04/25/palawan/#comments Sat, 25 Apr 2009 12:52:16 +0000 admin http://ysohtech.cafe24.com/wordpress/?p=25 http://www.jintour.co.kr/TS_Resort/PM_Viewer.php?GET_HRCODE=5261&IG_TYPE=HR_CODE&VTYPE=PHO

http://www.jintour.co.kr/

사용자 삽입 이미지

 

]]> http://ysohtech.cafe24.com/2009/04/25/palawan/feed/ Linux Multi Media Platform http://ysohtech.cafe24.com/2009/04/25/linux-multi-media-platform/ http://ysohtech.cafe24.com/2009/04/25/linux-multi-media-platform/#comments Sat, 25 Apr 2009 10:58:52 +0000 admin http://ysohtech.cafe24.com/wordpress/?p=20 - Title : Linux Multimedia Platform (LMP)
 
- Enviroments :
  Linux Fedora Core 5
  gcc
  SDL- 1.2.11
  IR Remote Controller
  SAM7 Mini Board
 
 - Screen Shots

 사용자 삽입 이미지

사용자 삽입 이미지

사용자 삽입 이미지

사용자 삽입 이미지

]]> http://ysohtech.cafe24.com/2009/04/25/linux-multi-media-platform/feed/ Sparta Flash File System (SFFS) http://ysohtech.cafe24.com/2009/04/25/sparta-flash-file-system-sffs/ http://ysohtech.cafe24.com/2009/04/25/sparta-flash-file-system-sffs/#comments Sat, 25 Apr 2009 10:50:00 +0000 admin http://ysohtech.cafe24.com/wordpress/?p=18 This is my first File System.
We wrote this paper in korean.
사용자 삽입 이미지

################# INTRODUCTION #################
Hello, we are
students and studying FILE SYSTEM in UNINVERSITY OF SEOUL.Suddenly, we
decided to make a new file system. but we couln’t make a new file
system.We got a motivation from FAT. We solved some problems that file
system.Anyway We are developing new file system. please Be expecting
our new file system. thank you.

################ COMPILATION ################
It
has been test on linux kernel 2.6.15 of fedora core5. and we don’t know
that file system is able to compile on another kernel version.it’s
possible. please send mail to me if you compile on another kernel
version.

########## USAGE ##########
1. util/mkfat /dev/2. insmod src/fat.ko3. mount -t fat /dev/

############ TESTING ############
Our
file system is still testing on linux kernel 2.6.15 and has many bugs.
We have to modify these problems.It’s very difficult. If you catch bugs
in our file system, please tell me through e-mail.
############ CONTACT ############
1.ysoh@uos.ac.kr (OH YONGSEOK)
We are going to welcome to your message. Any message will be a good advice to us.Thank you for your reading.

]]> http://ysohtech.cafe24.com/2009/04/25/sparta-flash-file-system-sffs/feed/ New Hybrid Allocation - Ext2 File System http://ysohtech.cafe24.com/2009/04/25/new-hybrid-allocation-ext2-file-system/ http://ysohtech.cafe24.com/2009/04/25/new-hybrid-allocation-ext2-file-system/#comments Sat, 25 Apr 2009 10:32:08 +0000 admin http://ysohtech.cafe24.com/wordpress/?p=17 https://sourceforge.net/projects/nha-ext2/

]]> http://ysohtech.cafe24.com/2009/04/25/new-hybrid-allocation-ext2-file-system/feed/