Date: Wed, 14 Jul 2010 17:55:03 -0400 From: Jung-uk Kim <jkim@FreeBSD.org> To: freebsd-stable@FreeBSD.org Cc: Oliver Fromme <olli@lurza.secnetix.de>, Andriy Gapon <avg@icyb.net.ua> Subject: Re: 8.1-PRERELEASE: CPU packages not detected correctly Message-ID: <201007141755.04690.jkim@FreeBSD.org> In-Reply-To: <201007141740.55798.jkim@FreeBSD.org> References: <201007141414.o6EEEUx9014690@lurza.secnetix.de> <4C3DF48E.1070502@icyb.net.ua> <201007141740.55798.jkim@FreeBSD.org>
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On Wednesday 14 July 2010 05:40 pm, Jung-uk Kim wrote: > On Wednesday 14 July 2010 01:31 pm, Andriy Gapon wrote: > > on 14/07/2010 17:14 Oliver Fromme said the following: > > > In a machine installed yesterday, 8.1-PRERELEASE doesn't > > > seem to detect the number of CPU packages vs. cores per > > > > > > package correctly: > > > | FreeBSD 8.1-PRERELEASE-20100713 #0: Tue Jul 13 19:51:18 UTC > > > | 2010 [...] > > > | CPU: Intel(R) Xeon(R) CPU L5408 @ 2.13GHz > > > | (2133.42-MHz K8-class CPU) Origin = "GenuineIntel" Id = > > > | 0x1067a Family = 6 Model = 17 Stepping = 10 > > > | Features=0xbfebfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC, > > > |SE > > > | P,MTRR,PGE,MCA,CMOV,PAT,PSE36,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE, > > > |SSE 2,SS,HTT,TM,PBE> > > > | Features2=0x40ce3bd<SSE3,DTES64,MON,DS_CPL,VMX,EST,TM2,SSSE3 > > > |,C X16,xTPR,PDCM,DCA,SSE4.1,XSAVE> AMD > > > | Features=0x20000800<SYSCALL,LM> > > > | AMD Features2=0x1<LAHF> > > > | TSC: P-state invariant > > > | real memory = 34359738368 (32768 MB) > > > | avail memory = 33151377408 (31615 MB) > > > | ACPI APIC Table: <IBM SERBLADE> > > > | FreeBSD/SMP: Multiprocessor System Detected: 8 CPUs > > > | FreeBSD/SMP: 1 package(s) x 8 core(s) > > > | cpu0 (BSP): APIC ID: 0 > > > | cpu1 (AP): APIC ID: 1 > > > | cpu2 (AP): APIC ID: 2 > > > | cpu3 (AP): APIC ID: 3 > > > | cpu4 (AP): APIC ID: 4 > > > | cpu5 (AP): APIC ID: 5 > > > | cpu6 (AP): APIC ID: 6 > > > | cpu7 (AP): APIC ID: 7 > > > | ioapic1 <Version 2.0> irqs 24-47 on motherboard > > > | ioapic0 <Version 2.0> irqs 0-23 on motherboard > > > > > > I'm pretty sure that this is a 2 x 4 machine (2 CPU packages > > > with 4 cores per package), not 1 x 8. That's what the BIOS > > > displays during POST. > > > > > > I'm not sure if this is just a "cosmetic" issue, or if this > > > is a critical thing ... I could imagine that performance > > > might be sub-optimal if the CPU topology isn't detected > > > correctly, but I'm not sure if FreeBSD can take advantage > > > of the topology. > > > > Could you please try to do the following? > > 1. Fetch topo-12212009.tar from the top of this page: > > http://software.intel.com/en-us/articles/intel-64-architecture-pr > >oc essor-topology-enumeration/ 2. Untar it and apply this patch to > > the code: > > http://people.freebsd.org/~avg/cpu-topology.diff > > 3. Compile it by running sh mk_64.sh (supposing you have amd64 > > system installed) 4. Run cpu_topology64.out and report back its > > output. > > It's funny that I actually wrote a convenience script (and cleaned > up today): > > http://people.freebsd.org/~jkim/cpu_topology-12212009.sh > > BTW, current topology detection code is not optimal for some Intel > processors if my memory serves. Surprisingly, I found a patch I wrote last year from /tmp of my desktop and it is still applied cleanly. 8-) Just in case, it is available from here: http://people.freebsd.org/~jkim/mp_machdep.diff It is applicable to both sys/amd64/amd64/mp_machdep.c and sys/i386/i386/mp_machdep.c. I have to warn you, though, it hasn't been used for more than a year, so it may not work at all. ;-) Jung-uk Kim
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