lkml.org 
[lkml]   [2000]   [Nov]   [15]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: rdtsc to mili secs?
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/

\
 
 \ /
  Last update: 2005-03-22 12:45    [W:0.078 / U:35.924 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site