Note that some kernel options are still configured through <tt>/proc/sys</tt> (or equivalently using <tt>sysctl</tt>, which is also called at boot time to read <tt>/etc/sysctl.conf</tt>). A general rule of thumb is that if the kernel option is related directly to some piece of hardware, it's probably configured via <tt>sysfs</tt> (eg. [NIC] settings such as [MTU]), and if it has to do with other kernel behaviour (eg. network [Protocol] settings), it'll be accessable via <tt>/proc/sys</tt>. Other examples for things you tweak via <tt>sysfs</tt> include [RAID], [SCSI] and other BlockDevice configuration such as [IO schedulers | LinuxIoScheduler]. 

  

 The [sysfsutils | http://linux-diag.sourceforge.net/Sysfsutils.html] contain a library and a CommandLine tool called <tt>systool</tt> to explore <tt>/sys</tt> and display and alter current settings. The corresponding [Debian] [Package] also uses this tool to provide boot time configuration of SysFs values through the <tt>/etc/sysfs.conf</tt> file. 

  

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 CategorySystemAdministration