Messages in this thread |  | | Date | Tue, 14 Nov 2000 22:22:40 +0100 | From | Pavel Machek <> | Subject | Re: rdtsc to mili secs? |
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Hi!
> > > Sensibly configured power saving/speed throttle systems do not change the > > > frequency at all. The duty cycle is changed and this controls the cpu > > > performance but the tsc is constant > > > > Do you have an example of notebook that does powersaving like that? > > I have 2 examples of notebooks with changing TSC speed... > > > > Intel PIIX-based systems will do duty-cycle throttling, for example.
Don't think so. My toshiba is PIIX-based, AFAIC:
root@bug:~# cat /proc/pci Bus 0, device 5, function 0: Bridge: Intel Corporation 82371AB PIIX4 ISA (rev 2). Bus 0, device 5, function 1: IDE interface: Intel Corporation 82371AB PIIX4 IDE (rev 1). Master Capable. Latency=64. I/O at 0x1000 [0x100f]. Bus 0, device 5, function 2: USB Controller: Intel Corporation 82371AB PIIX4 USB (rev 1). IRQ 11. Master Capable. Latency=64. I/O at 0xffe0 [0xffff]. Bus 0, device 5, function 3: Bridge: Intel Corporation 82371AB PIIX4 ACPI (rev 2).
Still, it is willing to run with RDTSC at 300MHz, 150MHz, and 40MHz. (The last one in _extreme_ cases when CPU fan fails -- running at 40MHz is better than cooking cpu).
-- I'm pavel@ucw.cz. "In my country we have almost anarchy and I don't care." Panos Katsaloulis describing me w.r.t. patents at discuss@linmodems.org - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org Please read the FAQ at http://www.tux.org/lkml/
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