From mboxrd@z Thu Jan 1 00:00:00 1970 From: Dominik Brodowski Subject: Re: 2.6.2: P4 ClockMod speed Date: Mon, 16 Feb 2004 22:34:35 +0100 Sender: cpufreq-bounces@www.linux.org.uk Message-ID: <20040216213435.GA9680@dominikbrodowski.de> Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="===============89564230222142527==" Return-path: List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: cpufreq-bounces+glkc-cpufreq=gmane.org@www.linux.org.uk To: dual_bereta_r0x@arenanetwork.com.br Cc: linux-kernel@vger.kernel.org, cpufreq@www.linux.org.uk --===============89564230222142527== Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="6c2NcOVqGQ03X4Wi" Content-Disposition: inline --6c2NcOVqGQ03X4Wi Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable Hi, > I have a P4 2.4 running @ 3.12GHz. So you overclock your CPU but then throttle it down... strange, but well... > In 2.6.0, i could change it frequency=20 > via speedfreqd(8) up to its actual speed. Since 2.6.1, its max speed is= =20 > locked on cpu *real* speed. It's just a change of appearance -- the cpufreq driver uses the theoretical speed of the CPU for its calculations; the actual CPU speed isn't affected. You can verify this by looking at /proc/cpuinfo which still tells 3124.376 MHz. By doing so it becomes easier to enter different frequencies e.g. into /sys/devices/system/cpu/cpufreq/scaling_setspeed -- on my desktop, typing in 1200000 is easier than 12121224... [*] Dominik [*] The _actual_ CPU speed should be used on all cpufreq drivers where this specific CPU frequency has implications to external components, e.g. LCD, memory or pcmcia devices. Where only the _frequency ratio_ is of importance [for loops_per_jiffy and friends] such "rounding" is acceptable, as long as the ratio is constant. --6c2NcOVqGQ03X4Wi Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.4 (GNU/Linux) iD8DBQFAMTdrZ8MDCHJbN8YRAjj5AJwNSM9VrxY/PzeLmaO3k0DSs2vFsgCcDapC rjFI9+GTF0Q6c3ug+ZhwBvg= =YIjZ -----END PGP SIGNATURE----- --6c2NcOVqGQ03X4Wi-- --===============89564230222142527== Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline _______________________________________________ Cpufreq mailing list Cpufreq@www.linux.org.uk http://www.linux.org.uk/mailman/listinfo/cpufreq --===============89564230222142527==--