为了很好地理解devfs，最好是先理解从设备驱动程序的角度来看devfs是怎样改变事物的。
To get a good understanding of devfs, it's best to first understand how devfs changes things from the perspective of the device driver.
各种网络设备驱动程序在接口层运行，该层从物理链路接收数据，并向物理链路传输数据。
The various network device drivers run at the interface layer, which receives and transmits data from and to the physical link.
对于 pSeries，使用 ibmsis 驱动程序来连接 Linux 所拥有的 pSeries 上的直接设备，可以从 ftp://lpatch.ncsa.uiuc.edu/redhat/rhel-3/pseries/ibmsis/ 下载得到它。
As with pSeries, the ibmsis driver is used to attach some Linux-owned direct devices on iSeries and is available from ftp://lpatch.ncsa.uiuc.edu/redhat/rhel-3/pseries/ibmsis/ for download.
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