debian里面开启dma功能,提高硬盘读写速度

debian里面开启dma功能,提高硬盘读写速度

1.安装hdparm

debian:~#aptitude install hdparm

手动起动DMA：

debian:~#hdparm -d1 /dev/hda

 2.配制系统起动时自动打开磁盘DMA
A.在 /etc/init.d/ 目录下新建文件dma-start.sh 内容如下：

#!/bin/sh
#This script start ATA100 DMA
hdparm -d1 /dev/hda

B.在/etc/rc2.d/下建一个连接到刚才建的文件

debian:~#ln -s /etc/init.d/dma-start.sh /etc/rc2.d/S95dma-start.sh

3.对比

debian:~# hdparm -d0 /dev/hda

  /dev/hda:
  setting using_dma to 0 (off)
  using_dma = 0 (off)

debian:~# hdparm -t /dev/hda

       /dev/hda: Timing buffered
         disk reads: 12 MB in 3.33 seconds = 3.61 MB/sec

debian:~# hdparm -d1 /dev/hda

        /dev/hda:
   setting using_dma to 1 (on)
   using_dma = 1 (on)

debian:~#hdparm -t /dev/hda

     /dev/hda: Timing buffered
   disk reads: 156 MB in 3.01 seconds = 51.89 MB/sec