Messages in this thread | | | Date | Sat, 13 Dec 2003 00:40:29 +0100 | From | Pavel Machek <> | Subject | Re: Increasing HZ (patch for HZ > 1000) |
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Hi!
> > Every notebook from thinkpad 560X up has produced some kind of > > cpu-load-related-noise. You'd have to throw out quite a lot of > > notebooks... > > You're right, I'm probably not the only one. It may be worth at least > having an option to change HZ to less annoying values. Otherwise there > are going to be lots of complaints when people try out 2.6 on their > laptops and hear that noise. On mine, I seriously could not stand the > noise more than 5 minutes. Not because it was that loud but 1 kHz is > really annoying.
Okay, we are probably taking other sounds. I can hear cpu-load-related noise on every notebook from thinkpad 560X -- in a quiet room, and on some machines its rather hard to notice. You probably have way more annoying problem.
> > PS: Jean, can you try how high you can get it? You might want to go to > > 24kHz so that no human can hear it, or to 100kHz to be kind to > > cats. At ~1MHz you'd be even kind to bats :-), but it is probably > > impossible to get over 200kHz or so. Still it might be funny > > experiment. > > For now, my patch only allows up to around 10 kHz. At that frequency, I > don't hear anything because the noise is not loud enough (ear is much > more sensitive at 1 kHz). Also, I have around 10% overhead on my > Pentium-M 1.6 GHz, so I guess it's not for everyone. Extrapolating from > there, I'd also say that at 100 kHz, it wouldn't do anything but handle > the interrupts, which is slightly annoying when you want to actually get > some work done :)
I wonder what happens at 200kHz then; system might detect some lost ticks and keep running at very slow speed... Pavel -- When do you have a heart between your knees? [Johanka's followup: and *two* hearts?] - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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