On Fri, 2014-07-11 at 12:51 -0400, Shawn Starr wrote: Note that only pre-rc1 kernel builds have the slub debugging stuff turned on. Builds of rc1 and later have it turned off. This is a compromise from the kernel team for the issue of slub debugging being incredibly slow. You can just keep slub_debug=- in your kernel parameters for all kernels, it'll never break anything, but most of the time it won't be doing anything. You can't turn kernel debugging off entirely at runtime; if the kernel has slub debugging enabled then turning it off will make things noticeably faster, but a slub debugging kernel with slub debugging turned off or a 'regular' debugging kernel will still be noticeably slower than a release kernel. -- Adam Williamson Fedora QA Community Monkey IRC: adamw | Twitter: AdamW_Fedora | XMPP: adamw AT happyassassin . net http://www.happyassassin.net