On Wed, 30 Jan 2013 10:45:53 -0500 Josh Boyer <jwboyer@xxxxxxxxxx> 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. ;) Happy to keep testing. kevin
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