The interesting init scripts for power management are those which are switch on by default. New services had been probably added after this review (February 2009). The simplest way how to check most of them was installed all packages which have init script in rawhide (future F-11) and then review them. Our attempt lead to new daemon which should started services on demand. But because of small number of services, which could be handled that way was
[soud] refused. Services of appropriate devices should be catching events from upstart/udev/DeviceKit instead of new daemon.
Part of the review was going through comps, whether there exist some barely used services in @base or so on, but nothing had been found.
The different types of hardware services
|fnfx||only for Toshiba laptops||fnfxd||Verify manufacture: "dmidecode -s system-manufacturer" and output will be f.e. "Dell Inc."|
|isdn4k-utils||configuration of isdn||isdn||/etc/rc.d/init.d/isdn|
|microcode_ctl||updates the microcode on Intel x86/x86-64 CPU's||microcode_ctl||Verify CPU: "dmidecode -s processor-manufacturer" output will be f.e. "Intel" and command uname give us architecture name f.e. "x86_64"|
|mt-st||tape drive management Mt (for magnetic tape drives) and st (for SCSI tape devices)||stinit||
devices are connected through scsi (the better one) and usb (low-end devices)
|openct||PC/SC-Lite, as CT-API driver, have primitive mechanism to export smart card readers to remote machines via TCP/IP||openct||udev wasn't sending information about our smart card reader inclued in keyboard|
|pcsc-lite||PC/SC Lite is to provide a Windows(R) SCard interface||pcscd||probably same problem as the previous smart card reader|
Notes: bluez is widely installed, so it should be fixed. Other services are not installed in any base group and the hardware like magnetic tape is not widely used. So probably there is no point of fixing these other services. In this list is not irda which has not service on by default. If there were fixes for interacting services with hardware on the event then it should be also fixed.
The service for printer
|cups||printers with various input: lpt, usb, lan||cups|
For possible switching off printing service:
- must be checked lpt, usb, lan (we can hardly check whether here is printer or not)
- some programmes could be dependent on running cups even for printing into file
|ices||streaming server||maybe it should be up only for streaming?|
|ifplugd||automatically configure your ethernet device when a cable is plugged in||this is now done by NetworkManager?|
|nas||audio equivalent of an X display server||could be off without network?|
|nfs-utils||NFS utilities and supporting clients and daemons for the kernel NFS server||only with network?|
|qpidd||An AMQP message broker daemon||only on network?|
|rpcbind||Universal Addresses to RPC Program Number Mapper||only on network?|
|samba||Samba Suite of programs||only on network?|
|ser||sip server||only on network?|
|munin-node||Network-wide graphing framework||only on network?|
Probably many of these services could be switch off, if the network is down. But probably these services for advanced users which are not of top of our list.
|mdadm||for sw raid|
|qemu||needs libvirtd on|
|ocfs2||only for cluster|
Probably for libvirt, qemu, xen or wine could be daemon up only when some application need it. But this will have definitely problem with permission. This could save boot time.
With new packages should be done better testing of power saving with/out services. In case there will be considerable difference with services on/off, then it might be worth trying find power save in init scripts.
- Measurement with services up/down [0%]