Date: Fri, 9 Jul 2004 11:06:35 -0700 From: Steve Kargl <sgk@troutmask.apl.washington.edu> To: Jon Noack <noackjr@alumni.rice.edu> Cc: freebsd-current@freebsd.org Subject: Re: Native preemption is the culprit [was Re: today's CURRENT lockups] Message-ID: <20040709180635.GA11419@troutmask.apl.washington.edu> In-Reply-To: <40EEDBB1.6090903@alumni.rice.edu> References: <20040705184940.GA2651@tybalt.greiner.local> <200407081317.53981.jhb@FreeBSD.org> <20040709111955.2901ce5b.taku@tackymt.homeip.net> <200407091315.16899.jhb@FreeBSD.org> <40EED38D.9010903@alumni.rice.edu> <20040709172511.GA10540@troutmask.apl.washington.edu> <40EEDBB1.6090903@alumni.rice.edu>
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On Fri, Jul 09, 2004 at 12:53:53PM -0500, Jon Noack wrote: > On 07/09/04 12:25, Steve Kargl wrote: > >On Fri, Jul 09, 2004 at 12:19:09PM -0500, Jon Noack wrote: > >>On 07/09/04 12:15, John Baldwin wrote: > >>>My test machine is not a true SMP machine either, just HTT. It > >>>has been running a -j 256 worldloop overnight with no problems, > >>>so I committed a slightly modified version of the patch > >>>yesterday. > >> > >>Did you test with a UP kernel? After your latest commit I have > >>been experiencing regular hard locks on my pre-HTT P4 machine. > >>Backing out rev. 1.114 of sched_ule.c fixes it. See my previous > >>message (Re: FreeBSD keeps hanging......): > >>http://docs.freebsd.org/cgi/mid.cgi?40EECC49.3070501 > > > >I've tested it on a UP kernel (HTT enabled, ACPI disabled, APIC > >enabled, ULE). Appears to work fine. > > Perhaps it's just extraneous information, but if it's really a UP kernel > (as in, no 'options SMP') then whether you have HTT enabled doesn't > matter at all -- the kernel won't use it. > Yes, I know. :-) I'm just reporting what dmesg tells me about the CPU. CPU: Mobile Intel(R) Pentium(R) 4 - M CPU 2.00GHz (1994.12-MHz 686-class CPU) Origin = "GenuineIntel" Id = 0xf27 Stepping = 7 Features=0xbfebf9ff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE> -- Steve
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