Date: Fri, 27 Jan 2006 01:11:54 -0800 From: John-Mark Gurney <gurney_j@resnet.uoregon.edu> To: Brian Candler <B.Candler@pobox.com> Cc: Peter Jeremy <PeterJeremy@optushome.com.au>, Poul-Henning Kamp <phk@phk.freebsd.dk>, current@freebsd.org, arch@freebsd.org Subject: Re: [TEST/REVIEW] CPU accounting patches Message-ID: <20060127091153.GU69162@funkthat.com> In-Reply-To: <20060127085653.GA51554@uk.tiscali.com> References: <20060125201450.GE25397@cirb503493.alcatel.com.au> <56988.1138220896@critter.freebsd.dk> <20060126101138.GA40773@uk.tiscali.com> <20060127024432.GT69162@funkthat.com> <20060127085653.GA51554@uk.tiscali.com>
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Brian Candler wrote this message on Fri, Jan 27, 2006 at 08:56 +0000: > I think what you're saying is: I'm at no risk of my CPU becoming maxed out > when speed has been automatically reduced by a power-saving daemon, because > it will only stay there if there is still some spare capacity (i.e. some > time is regularly spent in the HLT state). If not, the daemon will keep > cranking up the clock speed until there *is* some spare capacity, or until > max clock speed is reached. > > I guess this is OK, *if* you trust the power management system to do its job > properly. Unfortunately I have very bad experiences of such things. In many > cases I've ended up turning off power management completely and locking > everything at max clock speed. Mind you, if I do that, anything you do with > scaling factors isn't going to affect me, so actually I don't really care. > I'll shut up now :-) powerd(8): http://www.freebsd.org/cgi/man.cgi?query=powerd&apropos=0&sektion=0&manpath=FreeBSD+6.0-RELEASE+and+Ports&format=html DESCRIPTION The powerd utility monitors the system state and sets various power con- trol options accordingly. It offers three modes (maximum, minimum, and adaptive) that can be individually selected while on AC power or batter- ies. -- John-Mark Gurney Voice: +1 415 225 5579 "All that I will do, has been done, All that I have, has not."
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