F16 slowness

[Dave Jones]

On Fri, Sep 09, 2011 at 12:07:48PM -0500, Mike Chambers wrote:

 > Below are 4 kernels that I have tested to see what works ok and what
 > don't.  The 2 3.0 kernels both were extremely slow, and the 2 2.6.40
 > kernels were both faster and more responsive.  Using the latest 2.6.40
 > does still have X use up some CPU but haven't seen it get past 25%
 > compared to the 3.0 kernels both seem to go up past 50% ore more.
 > 
 > Seems whatever is the difference in the kernels (diff in how built?), or
 > whatever the difference in what they are built against might be the
 > issue, or a combination thereof.  Figure that out and might be onto
 > something.  Maybe others can try same thing and see what they get.
 > 
 > [mike at scrappy ~]$ rpm -q kernel
 > 
 > kernel-2.6.40.3-0.fc15.x86_64
 > kernel-3.1.0-0.rc4.git0.0.fc16.x86_64
 > kernel-3.0.1-5.fc16.x86_64
 > kernel-2.6.40.4-5.fc15.x86_64

you can turn off some of the heavier weight debugging by booting
the 3.0 kernels with "slub_debug=-"
(In the 2.6.40 builds, this is only on in the -debug flavor)

Debugging options are going to be turned off for the next builds
in time for the beta.

	Dave