Date: Mon, 30 Aug 2004 09:53:50 -0400 From: Alan Gerber <agerber@ncsu.edu> To: freebsd-mobile <freebsd-mobile@freebsd.org> Subject: Re: Enhanced SpeedStep driver available Message-ID: <4133316E.4090108@ncsu.edu> In-Reply-To: <1093872138.1503.1.camel@localhost> References: <6.1.0.6.1.20040816074348.03f99338@popserver.sfu.ca> <1093872138.1503.1.camel@localhost>
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Vladimir Grebenschikov wrote: >On Mon, 2004-08-16 at 08:06 -0700, Colin Percival wrote: > > >> Thanks to everyone who has been sending me data about their >>processors (and in particular, the 90nm versions), I now have >>a first draft of a Enhanced SpeedStep driver available. For >>people with the appropriate processors (Pentium M only), this >>makes it possible to adjust the cpu frequency via a new sysctl >>(hw.est_curfreq), and have the cpu voltage adjusted at the >>same time. >> I've also put together a very simple control daemon which >>reads kern.cp_time every second and adjusts the cpu frequency >>based on the fraction of cpu time which is idle. This increases >>my laptop's battery life by around 40%. >> All the code is online at >>http://www.daemonology.net/freebsd-est/ >> Assuming I don't hear any major bug reports in the next few >>days, I'll package these into ports and hopefully get them into >>the ports tree in time for 5.3-RELEASE. >> >> > >Amazing, only issue, flood of speed changing messages in dmesg, please >add: > >% cat /usr/ports/sysutils/est/files/patch-est.c-no-flood >--- est.c.orig Mon Aug 30 16:53:43 2004 >+++ est.c Mon Aug 30 16:54:38 2004 >@@ -505,8 +505,9 @@ > if (f->mhz == 0) > return (EOPNOTSUPP); > >- printf("Changing CPU frequency from %d MHz to %d MHz\n", >- mhz, mhz_wanted); >+ if (bootverbose) >+ printf("Changing CPU frequency from %d MHz to %d >MHz\n", >+ mhz, mhz_wanted); > > msr = rdmsr(MSR_PERF_CTL); > msr = (msr & ~(uint64_t)(0xffff)) | > >% > >or like > > > >>Colin Percival >> >> > > > I'd tend to agree. It works beautifully on my Dell D600, and while I don't have any numbers, I have noticed improved runtime on my battery. The flood of messages to the console is the only thing I've found with this utility that I don't like. Printing them in verbose mode is something I would deem as okay, but on a normal running system you can always use the OIDs that this driver puts into sysctl to get that info. Thanks for the hard work in this area! -- Alan Gerber
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