Date: Thu, 19 Aug 2010 13:26:08 -0400 From: Jung-uk Kim <jkim@FreeBSD.org> To: pluknet <pluknet@gmail.com> Cc: freebsd-stable@freebsd.org, Andriy Gapon <avg@icyb.net.ua> Subject: Re: 8.1-PRERELEASE: CPU packages not detected correctly Message-ID: <201008191326.09822.jkim@FreeBSD.org> In-Reply-To: <AANLkTi=hZC9gL2xF2oD9w5ApgZ11LyRf1WbE=3YZuHef@mail.gmail.com> References: <201007141414.o6EEEUx9014690@lurza.secnetix.de> <4C6D5E31.9000701@icyb.net.ua> <AANLkTi=hZC9gL2xF2oD9w5ApgZ11LyRf1WbE=3YZuHef@mail.gmail.com>
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On Thursday 19 August 2010 12:56 pm, pluknet wrote: > On 19 August 2010 20:39, Andriy Gapon <avg@icyb.net.ua> wrote: > > on 10/08/2010 19:55 pluknet said the following: > >> On 16 July 2010 19:47, Jung-uk Kim <jkim@freebsd.org> wrote: > >>> The patch should apply fine on both > >>> sys/amd64/amd64/mp_machdep.c and sys/i386/i386/mp_machdep.c. > >>> > >>> http://people.freebsd.org/~jkim/mp_machdep2.diff > >> > >> Hi. > >> > >> Just checked on Xen HVM with 3 cores. > >> 1) 8.1 unmodified: > >> FreeBSD/SMP: Multiprocessor System Detected: 3 CPUs > >> FreeBSD/SMP: 1 package(s) x 3 core(s) > >> > >> 2) 8.1 + patch > >> FreeBSD/SMP: Multiprocessor System Detected: 3 CPUs > >> FreeBSD/SMP: 0 package(s) x 1 core(s) x 32 HTT threads > >> WARNING: Non-uniform processors. > >> WARNING: Using suboptimal topology. > > > > Can you debug, e.g. with printfs, what exactly goes wrong? > > I wonder if in this case code follows some unusual/unexpected > > path. > > Sorry, I'm a bit busy right now. > I hope to debug this somewhere in the next week. > > > BTW, could you please also provide CPU name/model/features as > > detected by the kernel? > > Sure. > CPU: Intel(R) Xeon(R) CPU E5520 @ 2.27GHz (2763.12-MHz > 686-class CPU) Origin = "GenuineIntel" Id = 0x106a5 Family = 6 > Model = 1a Stepping = 5 > Features=0x1781fbbf<FPU,VME,DE,PSE,TSC,MSR,MCE,CX8,APIC,SEP,MTRR,PG >E,MCA,CMOV,PAT,MMX,FXSR,SSE,SSE2,HTT> > Features2=0x80982201<SSE3,SSSE3,CX16,SSE4.1,SSE4.2,POPCNT,<b31>> > TSC: P-state invariant > real memory = 4194304000 (4000 MB) > avail memory = 3932786688 (3750 MB) > ACPI APIC Table: <Xen HVM> > FreeBSD/SMP: Multiprocessor System Detected: 3 CPUs > FreeBSD/SMP: 0 package(s) x 1 core(s) x 32 HTT threads > cpu0 (BSP): APIC ID: 0 > cpu1 (AP/HT): APIC ID: 2 > cpu2 (AP/HT): APIC ID: 4 > > Just a thought. > # HTT might somehow correlate with current maxcpus limit (32). One thing I am not sure is whether those CPUID instructions are executed on *real* CPUs or translated in HVM. On top of that, I am not even sure they will be executed on *correct* cores. I bet they won't. If that's the case, we should add exception for virtualized environment as we did for default HZ. Jung-uk Kim
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