Identifying Bottlenecks & Optimizing Linux Performance in Embedded System Approach

Abstract

Nowadays, embedded systems with Linux OS are commonly applied in automotive industry. Some of applications require strict time response, and others need to be lesser time to boot up and less power consumption such as mobile, PDA etc. But the major problem with the embedded system is to improve embedded linux performance without affecting the performance of the embedded system. Dynamic power management (DPM) refers to the use of runtime strategies in order to achieve a tradeoff between the performance and power consumption of a system and its components. DPM has been a subject of intense research in the past decades driven by the need for low power in modern Embedded system. I present a formal method that have been explored in solving the system-level problem. Bad Blocks are blocks that contain one or more invalid bits whose reliability is not guaranteed. Bad Blocks may be present when the device is shipped, or may develop during the lifetime of the device. A Bad Block does not affect the performance of valid blocks because it is isolated from the bit line and common source line by a select transistor. Bad Block Management, Block Replacement and the Error Correction Code software are necessary to manage the error bits in NAND Flash devices. This dissertation addresses two key factors in embedded system design, namely minimization of power consumption and memory requirement. The first part of this dissertation considers the problem of optimizing power consumption. The second part deals with memory usage optimization mainly targeting the ash memory. Improving the uses of the ash memory with minimum time to access data.