Date: Fri, 9 Jul 2004 14:31:25 -0400 From: Kenneth Culver <culverk@sweetdreamsracing.biz> To: noackjr@alumni.rice.edu Cc: Steve Kargl <sgk@troutmask.apl.washington.edu> Subject: Re: Native preemption is the culprit [was Re: today's CURRENT lockups] Message-ID: <20040709143125.b48g4s4cogskg88s@www.sweetdreamsracing.biz> In-Reply-To: <40EEE01C.6090400@alumni.rice.edu> References: <20040705184940.GA2651@tybalt.greiner.local> <200407081317.53981.jhb@FreeBSD.org> <20040709111955.2901ce5b.taku@tackymt.homeip.net> <40EED38D.9010903@alumni.rice.edu> <20040709172511.GA10540@troutmask.apl.washington.edu> <40EEDBB1.6090903@alumni.rice.edu> <20040709180635.GA11419@troutmask.apl.washington.edu> <40EEE01C.6090400@alumni.rice.edu>
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Quoting Jon Noack <noackjr@alumni.rice.edu>: > On 07/09/04 13:06, Steve Kargl wrote: >> 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> > > Mine also lists HTT, but doesn't actually support it: > CPU: Intel(R) Pentium(R) 4 CPU 2.53GHz (2539.10-MHz 686-class CPU) > Origin = "GenuineIntel" Id = 0xf24 Stepping = 4 > > Features=0x3febfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM> > > I remember a discussion about this a long time ago, but don't remember > the details. Regardless, the flag doesn't actually mean the processor > supports HTT. > > Jon I was under the impression that all P4's support HTT, but a lot of bioses don't allow users to enable it. Ken
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