请教一个关于硬盘DMA的问题

[cashlu]

请教各位一个问题，我的硬盘是希捷SATA 120G，我用 sudo hdparm -tT /dev/sda这个命令，输出的结果如下：

Timing cached reads: 4040 MB in 2.00 seconds = 2020.31 MB/sec
Timing buffered disk reads: 160 MB in 3.03 seconds = 52.87 MB/sec

请问我的DMA是否开启？

[ichdenke]

surely have you enabled that. or you can get just 3 m/s in bufferd read