Date: Fri, 09 Jul 2004 13:12:44 -0500 From: Jon Noack <noackjr@alumni.rice.edu> To: Steve Kargl <sgk@troutmask.apl.washington.edu> Cc: freebsd-current@freebsd.org Subject: Re: Native preemption is the culprit [was Re: today's CURRENT lockups] Message-ID: <40EEE01C.6090400@alumni.rice.edu> In-Reply-To: <20040709180635.GA11419@troutmask.apl.washington.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> <20040709180635.GA11419@troutmask.apl.washington.edu>
next in thread | previous in thread | raw e-mail | index | archive | help
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
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?40EEE01C.6090400>