On Wed, 30 Jan 2013 12:43:03 -0500
Josh Boyer <jwboyer(a)redhat.com> wrote:
On Wed, Jan 30, 2013 at 10:38:39AM -0700, Kevin Fenzi wrote:
> On Wed, 30 Jan 2013 10:45:53 -0500
> Josh Boyer <jwboyer(a)redhat.com> wrote:
>
> > On Tue, Jan 29, 2013 at 02:53:53PM -0600, Bruno Wolff III wrote:
> > > I have just done some updates while running
> > > 3.8.0-0.rc5.git0.1.fc19. A couple of these machines were booted
> > > with slub_debug=- . They all seemed a bit slower (based on my
> > > watching the updates and not real benchmarks) than with
> >
> > Yeah, I had some noticable lag with 3.8.0-0.rc5.git1.1.fc19,
> > which has identical debug options set to the kernel you
> > mentioned. (Rawhide didn't go out yesterday, so I waited to turn
> > more on).
> >
> > When I booted with slub_debug=- the lag was less, but still
> > noticable. Seems CONFIG_PROVE_RCU might be a heavy hitter. We'll
> > see going forward.
> >
> > I plan on enabling atomic sleep debugging today. Please keep up
> > the testing and reporting everyone. It's much appreciated.
>
> Just finally had a chance to reboot into
> 3.8.0-0.rc5.git1.1.fc19.x86_64 here.
>
> It's very very very very slow graphically.
> Also, I note that there's a bunch of disk i/o going on, perhaps
> btrfs is having some poor interaction with the debugging?
>
> Booting with slub_debug=- brings everything back to usable for me.
>
> It looks like to me slub_debug is the thing that slows things down
> for my use case. ;)
Hm. So that option was the third one enabled. Showed up in
3.8.0-0.rc4.git5.1. Does that specific kernel also cause issues for
you?
Yeah, that one also shows the slowdown.
If not, I'm curious which one starts to because for your usecase
it
could be a mixture of options causing problems.
Here's my gtkperf numbers:
3.8.0-0.rc4.git3.1.fc19.x86_64
6.37
3.8.0-0.rc4.git4.1.fc19.x86_64
6.55
3.8.0-0.rc4.git5.1.fc19.x86_64
7.11
3.8.0-0.rc5.git1.1.fc19.x86_64
8.96
3.8.0-0.rc5.git2.1.fc19.x86_64
9.25
with slub-debug=-
3.8.0-0.rc4.git5.1.fc19.x86_64
6.67
3.8.0-0.rc5.git1.1.fc19.x86_64
6.75
3.8.0-0.rc5.git2.1.fc19.x86_64
6.59
kevin