Date: Wed, 14 Jul 2010 16:14:30 +0200 (CEST) From: Oliver Fromme <olli@lurza.secnetix.de> To: freebsd-stable@FreeBSD.ORG Subject: 8.1-PRERELEASE: CPU packages not detected correctly Message-ID: <201007141414.o6EEEUx9014690@lurza.secnetix.de>
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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,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE> | Features2=0x40ce3bd<SSE3,DTES64,MON,DS_CPL,VMX,EST,TM2,SSSE3,CX16,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. Best regards Oliver -- Oliver Fromme, secnetix GmbH & Co. KG, Marktplatz 29, 85567 Grafing b. M. Handelsregister: Registergericht Muenchen, HRA 74606, Geschäftsfuehrung: secnetix Verwaltungsgesellsch. mbH, Handelsregister: Registergericht Mün- chen, HRB 125758, Geschäftsführer: Maik Bachmann, Olaf Erb, Ralf Gebhart FreeBSD-Dienstleistungen, -Produkte und mehr: http://www.secnetix.de/bsd "A misleading benchmark test can accomplish in minutes what years of good engineering can never do." -- Dilbert (2009-03-02)
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