Re: cpu scaling questions

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On Mon, 2006-10-02 at 12:01 -0400, Dave Jones wrote:
> On Mon, Oct 02, 2006 at 09:45:27AM -0400, Thomas J. Baker wrote:
>  > 
>  > I've got two questions related to cpu scaling. On my laptop I've got a
>  > Core 2 Duo. Can the two cores scale frequencies independently?
> 
> No. Think about it. You have a single package, with a single power source.
> 
>  > Most of
>  > the time that doesn't seem like the case but every once in a while, my
>  > cpufreq applets show different speeds. I'm assuming that there is just a
>  > bit of slop involved and the two cores are always the same speed.
> 
> It's a bug, but it should be cosmetic only. It's on the TODO, but
> there are a number of other issues in this code that need tackling
> first before it gets clean enough to fix this properly.
> FC6-update/FC7 stuff.
> 
>  > On my desktop, I've got Xeon CPUs that support limited scaling; they run
>  > at either 2.8 or 3.4GHz. On FC5, they used to scale on demand but under
>  > FC6 they don't and the cpufreq applet has a manual setting for 2.8 or
>  > 3.4 with an automatic setting that is greyed out.
> 
> Which cpufreq driver were they using ?
> File a kernel bug, and attach dmesg.
> 
> 	Dave
>  
> 

Just curious - it must also a bug that under FC5, with two hyperthreaded
Xeon CPUs, all four logical processors scale independently?

I looked at my FC5 setup and had specified "DRIVER=acpi-cpufreq"
manually. Doing this for FC6 made the scaling behave like FC5,
automatically scaling up for load.

Thanks,

tjb
-- 
=======================================================================
| Thomas Baker                                  email: tjb@xxxxxxx    |
| Systems Programmer                                                  |
| Research Computing Center                     voice: (603) 862-4490 |
| University of New Hampshire                     fax: (603) 862-1761 |
| 332 Morse Hall                                                      |
| Durham, NH 03824 USA              http://wintermute.sr.unh.edu/~tjb |
=======================================================================

-- 
fedora-devel-list mailing list
fedora-devel-list@xxxxxxxxxx
https://www.redhat.com/mailman/listinfo/fedora-devel-list

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[Index of Archives]     [Fedora Announce]     [Fedora Kernel]     [Fedora Testing]     [Fedora Formulas]     [Fedora PHP Devel]     [Kernel Development]     [Fedora Legacy]     [Fedora Maintainers]     [Fedora Desktop]     [PAM]     [Red Hat Development]     [Gimp]     [Yosemite News]
  Powered by Linux