On Wed, 3 Oct 2007, Yuri Pankov wrote: > On Wed, Oct 03, 2007 at 04:50:09AM +0400, Yuri Pankov wrote: >> On Tue, Oct 02, 2007 at 04:53:33PM -0700, Jeff Roberson wrote: >>> Enclosed is a patch that does two things: >>> >>> 1) Reduces UP context switch time by over 10% making it faster than 4BSD >>> on UP. On SMP it's hard to compare since ULE can do as many as 30x as many >>> switches per second on my 8way system. >>> >>> 2) Restores old sched_yield() behavior from 6.x. This was changed in >>> -current unintentionally I think. >>> >>> I'd appreciate any extra testing. The ULE context switch time improvements >>> required some changes to the frequency that we recalculate priorities. I'm >>> mostly interested in hearing whether this causes any regression in normal >>> workloads. >>> >>> Those of you still using 4BSD can also verify that the yield changes don't >>> cause any problems there. >>> >>> Thanks, >>> Jeff >> >> Jeff, >> >> Patch applied cleanly, though with new kernel I got a panic just after >> boot - on xdm startup, I guess (crashdump wasn't saved), a lot of the same messages >> (copied by hand): >> >> cpuid = 0 >> panic: _mtx_lock_sleep: recursed on non-recursive mutex >> audit_mtx_at_/usr/src/sys/security/audit_worker.c:518 >> >> and after few seconds system just hangs. >> >> Any hints? >> >> -- >> Yuri Pankov <yuri.pankov_at_gmail.com> > > Sorry for being so verbose... Did you 'make depend' as well? If you patch -R < yield.diff does this kernel work? I'm not sure how my changes could cause this type of bug. Thanks, Jeff > > It's UP amd64 with SCHED_ULE > > kernel config: > > include GENERIC > ident DARKLIGHT > > nooptions SCHED_4BSD > options SCHED_ULE > > -- > Yuri Pankov <yuri.pankov_at_gmail.com> >Received on Wed Oct 03 2007 - 00:52:19 UTC
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