On Mon, 2007-10-15 at 20:18 +0200, P.U.Kruppa wrote: > On Mon, 15 Oct 2007, Ken Smith wrote: > > > > > I think it's fairly common knowledge by now but... The ULE scheduler is > > "back" and has been doing VERY nicely. We actually had an internal > > discussion about making it the default for 7.0. In the end it was > > decided that ULE "just barely missed the bus". Its performance makes > > giving it a try once 7.0 comes out definitely worthwhile but it was just > > barely "too new" for us to be truly comfortable with changing it to be > > the default. We'd like it to have the exposure of one release cycle > > (7.0-REL) before it becomes the default. For now we're planning to make > > it the default for 7.1-REL. > > > > To that end either Jeff or I will be switching the default scheduler in > > 8.0-CURRENT for the amd64 and i386 architectures over to ULE in a couple > > days (Wednesday-ish). > But it is and will be available for 7.0 ??? > Yes, it's in RELENG_7 (what will be 7.0) now but it's not the default. You can switch to it by rebuilding the kernel from a config file that changes the scheduler to ULE. What you would need to change in a kernel config file (based on RELENG_7's sys/i386/conf/GENERIC) would be: Index: sys/i386/conf/GENERIC =================================================================== RCS file: /home/ncvs/src/sys/i386/conf/GENERIC,v retrieving revision 1.474.2.1 diff -u -r1.474.2.1 GENERIC --- sys/i386/conf/GENERIC 11 Oct 2007 06:20:26 -0000 1.474.2.1 +++ sys/i386/conf/GENERIC 15 Oct 2007 18:24:38 -0000 _at__at_ -28,7 +28,7 _at__at_ makeoptions DEBUG=-g # Build kernel with gdb(1) debug symbols -options SCHED_4BSD # 4BSD scheduler +options SCHED_ULE # ULE scheduler options PREEMPTION # Enable kernel thread preemption options INET # InterNETworking options INET6 # IPv6 communications protocols -- Ken Smith - From there to here, from here to | kensmith_at_cse.buffalo.edu there, funny things are everywhere. | - Theodore Geisel |
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