8.1-PRERELEASE: CPU packages not detected correctly
Andriy Gapon
avg at icyb.net.ua
Wed Jul 14 17:32:09 UTC 2010
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,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.
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-processor-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.
Thanks!
--
Andriy Gapon
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