From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ducrot Bruno Subject: Re: Cpufreq: powernow-k7 weirdness Date: Sun, 6 Jul 2003 20:48:01 +0200 Sender: cpufreq-admin@www.linux.org.uk Message-ID: <20030706184801.GY7796@poupinou.org> References: <20030706012114.GW7796@poupinou.org> <1057511460.d2cf9bc12efe7@carlthompson.net> <20030706172809.GA10482@localhost.localdomain> <1057513385.41339271e1388@carlthompson.net> Mime-Version: 1.0 Return-path: Content-Disposition: inline In-Reply-To: <1057513385.41339271e1388@carlthompson.net> Errors-To: cpufreq-admin@www.linux.org.uk List-Unsubscribe: , List-Id: List-Post: List-Help: List-Subscribe: , List-Archive: Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: Carl Thompson Cc: cpufreq@www.linux.org.uk On Sun, Jul 06, 2003 at 10:43:05AM -0700, Carl Thompson wrote: > Quoting Jay Goodman Tamboli : > > > ... > > > Yeah, I found this in 2.4.21-ac4, too, and was having > > crashes. Fixing this bug still causes lockups if I change > > the cpufreq too drastically. Going from one setting to the > > next (i.e. not skipping any available speeds) seems to work > > ok, though. This is a Sony FR130, so is this the effect of > > the PST problems discussed earlier? > > No. This is a problem I discovered a while back during testing of my CPU > speed setting daemon (see the list archives). It's just that some CPUs / > chipsets require smooth rather than drastic transitions. (In other words, > when switching from speed X to speed Y, you should switch to every speed in > between during the transition instead of directly.) I believe only Mobile > AMD chips have this behavior. I believe 2.5 has a fix in for this? Also, > yy program automatically handles this for you when switching speeds; I will > definitely post a version today. > Things should be a little bit more smooth, but there is still deadlock when for example you switch from max freq. to min. -- Ducrot Bruno -- Which is worse: ignorance or apathy? -- Don't know. Don't care.