Hi bugs@,
7.8 amd64 incorrectly identifies a Opteron 4256EE as threaded. Thinking
it has 4 cores with 8 threads total. This processor should have 8
native cores. Thus, 4 cores are disabled unless sysctl hw.smt=1.
Interestingly, 7.8 correctly identifies the 4162 EE as having 6 native
cores.
Thank you!
-Henrich
dmesg:
OpenBSD 7.8 (GENERIC.MP) #1: Sat Nov 29 11:02:59 MST 2025
[email protected]:/usr/src/sys/arch/amd64/compile/GENERIC.MP
real mem = 34324676608 (32734MB)
avail mem = 33257316352 (31716MB)
random: good seed from bootblocks
mpath0 at root
scsibus0 at mpath0: 256 targets
mainbus0 at root
bios0 at mainbus0: SMBIOS rev. 2.6 @ 0x9ac00 (30 entries)
bios0: vendor American Megatrends Inc. version "3.5" date 01/12/2015
bios0: Supermicro H8SCM
acpi0 at bios0: ACPI 3.0
acpi0: sleep states S0 S1 S4 S5
acpi0: tables DSDT FACP APIC MCFG OEMB HPET SRAT SSDT EINJ BERT ERST HEST
acpi0: wakeup devices PC02(S4) PC03(S4) PC04(S4) PC05(S4) PC06(S4) PC07(S4)
PC09(S4) PC0A(S4) PC0B(S4) PC0C(S4) SBAZ(S4) P0PC(S4) UHC1(S4) UHC2(S4)
UHC3(S4) USB4(S4) [...]
acpitimer0 at acpi0: 3579545 Hz, 24 bits
acpimadt0 at acpi0 addr 0xfee00000: PC-AT compat
cpu0 at mainbus0: apid 16 (boot processor)
cpu0: AMD Opteron(tm) Processor 4256 EE, 1600.68 MHz, 15-01-02, patch 0600063e
cpu0: cpuid 1
edx=178bfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,MMX,FXSR,SSE,SSE2,HTT>
ecx=1698220b<SSE3,PCLMUL,MWAIT,SSSE3,CX16,SSE4.1,SSE4.2,POPCNT,AES,XSAVE,AVX>
cpu0: cpuid 6 eax=4<ARAT> ecx=1<EFFFREQ>
cpu0: cpuid 80000001 edx=2fd3fbff<NXE,MMXX,FFXSR,PAGE1GB,RDTSCP,LONG>
ecx=1c93fff<LAHF,CMPLEG,SVM,EAPICSP,AMCR8,ABM,SSE4A,MASSE,3DNOWP,OSVW,IBS,XOP,SKINIT,FMA4,NODEID,TOPEXT,CPCTR>
cpu0: cpuid 80000007 edx=3d9<HWPSTATE,ITSC>
cpu0: cpuid 80000008 ebx=1000<IBPB>
cpu0: 16KB 64b/line 4-way D-cache, 64KB 64b/line 2-way I-cache, 2MB 64b/line
16-way L2 cache, 8MB 64b/line 64-way L3 cache
cpu0: smt 0, core 0, package 0
mtrr: Pentium Pro MTRR support, 8 var ranges, 88 fixed ranges
cpu0: apic clock running at 200MHz
cpu0: mwait min=64, max=64, IBE
cpu1 at mainbus0: apid 17 (application processor)
cpu1: AMD Opteron(tm) Processor 4256 EE, 1600.77 MHz, 15-01-02, patch 0600063e
cpu1: cpuid 80000001 ecx=+8000<WDT>
cpu1: smt 1, core 0, package 0
cpu2 at mainbus0: apid 18 (application processor)
cpu2: AMD Opteron(tm) Processor 4256 EE, 1600.77 MHz, 15-01-02, patch 0600063e
cpu2: cpuid 80000001 ecx=-8000<WDT>
cpu2: smt 0, core 1, package 0
cpu3 at mainbus0: apid 19 (application processor)
cpu3: AMD Opteron(tm) Processor 4256 EE, 1600.93 MHz, 15-01-02, patch 0600063e
cpu3: cpuid 80000001 ecx=+8000<WDT>
cpu3: smt 1, core 1, package 0
cpu4 at mainbus0: apid 20 (application processor)
cpu4: AMD Opteron(tm) Processor 4256 EE, 1600.83 MHz, 15-01-02, patch 0600063e
cpu4: cpuid 80000001 ecx=-8000<WDT>
cpu4: smt 0, core 2, package 0
cpu5 at mainbus0: apid 21 (application processor)
cpu5: AMD Opteron(tm) Processor 4256 EE, 1601.26 MHz, 15-01-02, patch 0600063e
cpu5: cpuid 80000001 ecx=+8000<WDT>
cpu5: smt 1, core 2, package 0
cpu6 at mainbus0: apid 22 (application processor)
cpu6: AMD Opteron(tm) Processor 4256 EE, 1600.90 MHz, 15-01-02, patch 0600063e
cpu6: cpuid 80000001 ecx=-8000<WDT>
cpu6: smt 0, core 3, package 0
cpu7 at mainbus0: apid 23 (application processor)
cpu7: AMD Opteron(tm) Processor 4256 EE, 1601.52 MHz, 15-01-02, patch 0600063e
cpu7: cpuid 80000001 ecx=+8000<WDT>
cpu7: smt 1, core 3, package 0
ioapic0 at mainbus0: apid 0 pa 0xfec00000, version 21, 24 pins
ioapic1 at mainbus0: apid 1 pa 0xfec20000, version 21, 32 pins
acpimcfg0 at acpi0
acpimcfg0: addr 0xe0000000, bus 0-255
acpihpet0 at acpi0: 14318180 Hz
acpiprt0 at acpi0: bus 0 (PCI0)
acpiprt1 at acpi0: bus -1 (PC02)
acpiprt2 at acpi0: bus -1 (PC03)
acpiprt3 at acpi0: bus -1 (PC04)
acpiprt4 at acpi0: bus 1 (PC09)
acpiprt5 at acpi0: bus 2 (PC0A)
acpiprt6 at acpi0: bus 3 (P0PC)
acpipci0 at acpi0 PCI0
acpicmos0 at acpi0
"PNP0303" at acpi0 not configured
com0 at acpi0 UAR1 addr 0x3f8/0x8 irq 4: ns16550a, 16 byte fifo
com0: console
com1 at acpi0 UAR2 addr 0x2f8/0x8 irq 3: ns16550a, 16 byte fifo
acpibtn0 at acpi0: PWRB
acpicpu0 at acpi0: C2(0@100 io@0x815), C1(@1 halt!), PSS
acpicpu1 at acpi0: C2(0@100 io@0x815), C1(@1 halt!), PSS
acpicpu2 at acpi0: C2(0@100 io@0x815), C1(@1 halt!), PSS
acpicpu3 at acpi0: C2(0@100 io@0x815), C1(@1 halt!), PSS
acpicpu4 at acpi0: C2(0@100 io@0x815), C1(@1 halt!), PSS
acpicpu5 at acpi0: C2(0@100 io@0x815), C1(@1 halt!), PSS
acpicpu6 at acpi0: C2(0@100 io@0x815), C1(@1 halt!), PSS
acpicpu7 at acpi0: C2(0@100 io@0x815), C1(@1 halt!), PSS
ipmi at mainbus0 not configured
cpu0: 1600 MHz: speeds: 1600 1500 1400 1300 1000 MHz
pci0 at mainbus0 bus 0
pchb0 at pci0 dev 0 function 0 "ATI SR5650 Host" rev 0x02
ppb0 at pci0 dev 9 function 0 "ATI SR5690 PCIE" rev 0x00: msi
pci1 at ppb0 bus 1
em0 at pci1 dev 0 function 0 "Intel 82574L" rev 0x00: msi, address
0c:c4:7a:76:00:7c
ppb1 at pci0 dev 10 function 0 "ATI SR5690 PCIE" rev 0x00: msi
pci2 at ppb1 bus 2
em1 at pci2 dev 0 function 0 "Intel 82574L" rev 0x00: msi, address
0c:c4:7a:76:00:7d
ahci0 at pci0 dev 17 function 0 "ATI SBx00 SATA" rev 0x00: apic 0 int 22, AHCI
1.1
ahci0: port 0: 3.0Gb/s
scsibus1 at ahci0: 32 targets
sd0 at scsibus1 targ 0 lun 0: <ATA, WDC WD1000DHTZ-0, 04.0> naa.50014ee65ac669ef
sd0: 953869MB, 512 bytes/sector, 1953525168 sectors
ohci0 at pci0 dev 18 function 0 "ATI SB700 USB" rev 0x00: apic 0 int 16,
version 1.0, legacy support
ohci1 at pci0 dev 18 function 1 "ATI SB700 USB" rev 0x00: apic 0 int 16,
version 1.0, legacy support
ehci0 at pci0 dev 18 function 2 "ATI SB700 USB2" rev 0x00: apic 0 int 17
usb0 at ehci0: USB revision 2.0
uhub0 at usb0 configuration 1 interface 0 "ATI EHCI root hub" rev 2.00/1.00
addr 1
ohci2 at pci0 dev 19 function 0 "ATI SB700 USB" rev 0x00: apic 0 int 18,
version 1.0, legacy support
ohci3 at pci0 dev 19 function 1 "ATI SB700 USB" rev 0x00: apic 0 int 18,
version 1.0, legacy support
ehci1 at pci0 dev 19 function 2 "ATI SB700 USB2" rev 0x00: apic 0 int 19
usb1 at ehci1: USB revision 2.0
uhub1 at usb1 configuration 1 interface 0 "ATI EHCI root hub" rev 2.00/1.00
addr 1
piixpm0 at pci0 dev 20 function 0 "ATI SBx00 SMBus" rev 0x3d: SMI
iic0 at piixpm0
sdtemp0 at iic0 addr 0x18: cat34ts02
sdtemp1 at iic0 addr 0x19: cat34ts02
sdtemp2 at iic0 addr 0x1a: cat34ts02
sdtemp3 at iic0 addr 0x1b: stts2002
nvt0 at iic0 addr 0x2f: W83795G
spdmem0 at iic0 addr 0x50: 8GB DDR3 SDRAM registered ECC PC3-10600 with thermal
sensor
spdmem1 at iic0 addr 0x51: 8GB DDR3 SDRAM registered ECC PC3-10600 with thermal
sensor
spdmem2 at iic0 addr 0x52: 8GB DDR3 SDRAM registered ECC PC3-10600 with thermal
sensor
spdmem3 at iic0 addr 0x53: 8GB DDR3 SDRAM registered ECC PC3-10600 with thermal
sensor
pcib0 at pci0 dev 20 function 3 "ATI SB700 ISA" rev 0x00
ppb2 at pci0 dev 20 function 4 "ATI SB600 PCI" rev 0x00
pci3 at ppb2 bus 3
vga1 at pci3 dev 4 function 0 "Matrox MGA G200eW" rev 0x0a
wsdisplay at vga1 not configured
ohci4 at pci0 dev 20 function 5 "ATI SB700 USB" rev 0x00: apic 0 int 18,
version 1.0, legacy support
pchb1 at pci0 dev 24 function 0 "AMD 15/0xh Link Cfg" rev 0x00
pchb2 at pci0 dev 24 function 1 "AMD 15/0xh Address Map" rev 0x00
pchb3 at pci0 dev 24 function 2 "AMD 15/0xh DRAM Cfg" rev 0x00
km0 at pci0 dev 24 function 3 "AMD 15/0xh Misc Cfg" rev 0x00
pchb4 at pci0 dev 24 function 4 "AMD 15/0xh CPU Power" rev 0x00
pchb5 at pci0 dev 24 function 5 "AMD 15/0xh Host" rev 0x00
usb2 at ohci0: USB revision 1.0
uhub2 at usb2 configuration 1 interface 0 "ATI OHCI root hub" rev 1.00/1.00
addr 1
usb3 at ohci1: USB revision 1.0
uhub3 at usb3 configuration 1 interface 0 "ATI OHCI root hub" rev 1.00/1.00
addr 1
usb4 at ohci2: USB revision 1.0
uhub4 at usb4 configuration 1 interface 0 "ATI OHCI root hub" rev 1.00/1.00
addr 1
usb5 at ohci3: USB revision 1.0
uhub5 at usb5 configuration 1 interface 0 "ATI OHCI root hub" rev 1.00/1.00
addr 1
isa0 at pcib0
isadma0 at isa0
pckbc0 at isa0 port 0x60/5 irq 1 irq 12
pckbd0 at pckbc0 (kbd slot)
wskbd0 at pckbd0 mux 1
pcppi0 at isa0 port 0x61
spkr0 at pcppi0
wbsio0 at isa0 port 0x2e/2: W83627DHG-P rev 0x73
wbsio0 port 0xa10/2 not configured
usb6 at ohci4: USB revision 1.0
uhub6 at usb6 configuration 1 interface 0 "ATI OHCI root hub" rev 1.00/1.00
addr 1
vmm0 at mainbus0: SVM/RVI
vscsi0 at root
scsibus2 at vscsi0: 256 targets
softraid0 at root
scsibus3 at softraid0: 256 targets
root on sd0a (8571f49c59f83abb.a) swap on sd0b dump on sd0b
