8.1-PRERELEASE: CPU packages not detected correctly
Oliver Fromme
olli at lurza.secnetix.de
Wed Jul 14 14:14:50 UTC 2010
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.
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what years of good engineering can never do." -- Dilbert (2009-03-02)
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