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Date: Fri, 9 Jul 2004 11:06:35 -0700
From: Steve Kargl <sgk@troutmask.apl.washington.edu>
To: Jon Noack <noackjr@alumni.rice.edu>
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cc: Taku YAMAMOTO <taku@tackymt.homeip.net>
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Subject: Re: Native preemption is the culprit [was Re: today's CURRENT
	lockups]
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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