On Wed, 30 Jan 2013 12:43:03 -0500 Josh Boyer <jwboyer@xxxxxxxxxx> 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@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. ;) > > 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
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