[maemo-developers] Where are the N900 "too much time at 600Mhz" safeguards?
From: Igor.Stoppa at nokia.com Igor.Stoppa at nokia.comDate: Thu Jan 28 01:34:23 EET 2010
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Hi, whereis the contraddiction? I wouldn't consider 95% to be so little :-D But the idea is that, if you have a task that is CPU bound, you are getting some bang for your bucks, it's not done pointlessly. Anyway, unless you are planning to do Seti at N900 or something similar, it is unlikely you will keep your device in that state indefinitely, which is what i was warning against. Cheers, Igor ________________________________________ From: maemo-developers-bounces at maemo.org [maemo-developers-bounces at maemo.org] On Behalf Of ext Javier S. Pedro [maemo at javispedro.com] Sent: 28 January 2010 00:43 To: maemo-developers at maemo.org Subject: Where are the N900 "too much time at 600Mhz" safeguards? When I got my N900, one of the first things I noticed is that (as measured by powertop) I could never get a 100% ratio at 600 Mhz, but more like 95%. I quickly assumed this was the safeguard for the issue Igor Stoppa talked about at the Maemo Summit. However, I've noticed today (as suggested by a tmo post) that the above is not caused by any special modification in the kernel, but rather because of the CPU idling while waiting for the SGX / some other hw (so, testing methodology failure on my part :) ). Thus, given any task bounded by raw CPU throughput, the device will happily clock itself at 600Mhz, even for hours. Doesn't that contradict what Igor said at the summit? -- Javier _______________________________________________ maemo-developers mailing list maemo-developers at maemo.org https://lists.maemo.org/mailman/listinfo/maemo-developers
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