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	Linux From Scratch/chapter04_aboutsbus — Chinese (Simplified Han script)	On some newer systems, the motherboard is capable of controlling the system clock speed. This can be controlled with a command such as <command>powerprofilesctl</command>. This is not available in LFS, but may be available on the host distro. After LFS is complete, it can be added to a system with the procedures at the <ulink url='&blfs-book;sysutils/power-profiles-daemon.html'> BLFS power-profiles-daemon</ulink> page. Before measuring the build time of any package it is advisable to use a system power profile set for maximum performance (and maximum power consumption). Otherwise the measured SBU value may be inaccurate because the system may react differently when building <xref linkend='ch-tools-binutils-pass1'/> or other packages. Be aware that a significant inaccuracy can still show up even if the same profile is used for both packages because the system may respond slower if the system is idle when starting the build procedure. Setting the power profile to <quote>performance</quote> will minimize this problem. And obviously doing so will also make the system build LFS faster.
	Linux From Scratch/chapter04_aboutsbus — Chinese (Simplified Han script)	If <command>powerprofilesctl</command> is available, issue the <command>powerprofilesctl set performance</command> command to select the <literal>performance</literal> profile. Some distros provides the <command>tuned-adm</command> command for managing the profiles instead of <command>powerprofilesctl</command>, on these distros issue the <command>tuned-adm profile throughput-performance</command> command to select the <literal>throughput-performance</literal> profile.
	Linux From Scratch/chapter04_aboutsbus — Chinese (Simplified Han script)	The times presented here for all packages (except <xref linkend='ch-tools-binutils-pass1'/> which is based on one core) are based upon using four cores (-j4). The times in Chapter 8 also include the time to run the regression tests for the package unless specified otherwise.