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Old 2 Weeks Ago
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Default Conflicting Indications of Hyper-Threading

I recently picked up a used HP Media Center m7467c PC. It has an Intel Pentium D 940 Presler cpu. I've been investigating potential hyper-threading for the cpu, since it can be a security problem. Here's what I've found so far:

1) The Intel page linked above says it does not have hyper-threading.

2) The WikiPedia page for Pentium D's does not suggest that the 940 has hyper-threading.

3) The BIOS does not have a feature to toggle hyper-threading.

4) I was able to conveniently boot an older version of OpenBSD. At the beginning of the dmesg it says:

Code:
OpenBSD 5.4-current (GENERIC) #58: Mon Sep 23 22:57:09 MDT 2013
    todd@i386.openbsd.org:/usr/src/sys/arch/i386/compile/GENERIC
cpu0: Intel(R) Pentium(R) D CPU 3.20GHz ("GenuineIntel" 686-class) 3.21 GHz
cpu0: FPU,V86,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2,\
SS,HTT,TM,PBE,NXE,LONG,SSE3,DTES64,MWAIT,DS-CPL,VMX,CNXT-ID,CX16,xTPR,PDCM,LAHF
Note the hi-lited HTT, which I think means Hyper-Threading Technology. Also, not sure if this is relevant, but this kernel is i386 and not "mp", while the cpu is 64-bit with 2 cores.

I'm wondering why the HTT is there? Is it wrong? Or does this feature list refer not to this specific CPU, but to Pentium D's in general, some of which do have hyper-threading?

Thanks for any insights.
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Old 2 Weeks Ago
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HTT means hyperthreading, yes.
Give us a full dmesg. Your CPU topology is a bit later in the dmesg.
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Thanks, here is a full dmesg I just collected from a different version, 5.6-beta with MP.

Code:
OpenBSD 5.6-beta (GENERIC.MP) #267: Tue Jul 22 19:20:41 MDT 2014
    deraadt@i386.openbsd.org:/usr/src/sys/arch/i386/compile/GENERIC.MP
cpu0: Intel(R) Pentium(R) D CPU 3.20GHz ("GenuineIntel" 686-class) 3.21 GHz
cpu0: FPU,V86,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2,S
S,HTT,TM,PBE,NXE,LONG,SSE3,DTES64,MWAIT,DS-CPL,VMX,CNXT-ID,CX16,xTPR,PDCM,LAHF
real mem  = 2145804288 (2046MB)
avail mem = 2098270208 (2001MB)
mpath0 at root
scsibus0 at mpath0: 256 targets
mainbus0 at root
bios0 at mainbus0: AT/286+ BIOS, date 06/23/06, BIOS32 rev. 0 @ 0xf1e30, SMBIOS rev. 2.4 @ 0xf0000 (58 entries)
bios0: vendor Phoenix Technologies, LTD version "3.15" date 06/23/2006
bios0: HP Pavilion 061 ER881AA-ABA M7467C
acpi0 at bios0: rev 0
acpi0: sleep states S0 S1 S3 S4 S5
acpi0: tables DSDT FACP MCFG APIC
acpi0: wakeup devices PEX0(S5) PEX1(S5) PEX2(S5) PEX3(S5) PEX4(S5) PEX5(S5) HUB0(S5) UAR1(S5) PS2M(S4) PS2K(S4)
USB0(S3) USB1(S3) USB2(S3) USB3(S3) USBE(S3) AC97(S5) [...]
acpitimer0 at acpi0: 3579545 Hz, 24 bits
acpimcfg0 at acpi0 addr 0xf0000000, bus 0-255
acpimadt0 at acpi0 addr 0xfee00000: PC-AT compat
cpu0 at mainbus0: apid 0 (boot processor)
mtrr: Pentium Pro MTRR support, 8 var ranges, 88 fixed ranges
cpu0: apic clock running at 200MHz
cpu0: mwait min=64, max=64
cpu1 at mainbus0: apid 1 (application processor)
cpu1: Intel(R) Pentium(R) D CPU 3.20GHz ("GenuineIntel" 686-class) 3.21 GHz
cpu1: FPU,V86,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2,S
S,HTT,TM,PBE,NXE,LONG,SSE3,DTES64,MWAIT,DS-CPL,VMX,CNXT-ID,CX16,xTPR,PDCM,LAHF
ioapic0 at mainbus0: apid 4 pa 0xfec00000, version 20, 24 pins
ioapic0: misconfigured as apic 0, remapped to apid 4
acpiprt0 at acpi0: bus 0 (PCI0)
acpiprt1 at acpi0: bus -1 (PEX0)
acpiprt2 at acpi0: bus -1 (PEX1)
acpiprt3 at acpi0: bus -1 (PEX2)
acpiprt4 at acpi0: bus -1 (PEX3)
acpiprt5 at acpi0: bus -1 (PEX4)
acpiprt6 at acpi0: bus -1 (PEX5)
acpiprt7 at acpi0: bus 1 (HUB0)
acpicpu0 at acpi0
acpicpu1 at acpi0
acpitz0 at acpi0: critical temperature is 75 degC
acpibtn0 at acpi0: PWRB
bios0: ROM list: 0xc0000/0x8000
pci0 at mainbus0 bus 0: configuration mode 1 (bios)
pchb0 at pci0 dev 0 function 0 "Intel 82945G Host" rev 0x81
azalia0 at pci0 dev 27 function 0 "Intel 82801GB HD Audio" rev 0x01: msi
azalia0: codecs: Realtek ALC882
audio0 at azalia0
uhci0 at pci0 dev 29 function 0 "Intel 82801GB USB" rev 0x01: apic 4 int 23
uhci1 at pci0 dev 29 function 1 "Intel 82801GB USB" rev 0x01: apic 4 int 19
uhci2 at pci0 dev 29 function 2 "Intel 82801GB USB" rev 0x01: apic 4 int 18
uhci3 at pci0 dev 29 function 3 "Intel 82801GB USB" rev 0x01: apic 4 int 16
ehci0 at pci0 dev 29 function 7 "Intel 82801GB USB" rev 0x01: apic 4 int 23
usb0 at ehci0: USB revision 2.0
uhub0 at usb0 "Intel EHCI root hub" rev 2.00/1.00 addr 1
ppb0 at pci0 dev 30 function 0 "Intel 82801BA Hub-to-PCI" rev 0xe1
pci1 at ppb0 bus 1
"VIA VT6306 FireWire" rev 0x80 at pci1 dev 1 function 0 not configured
vga1 at pci1 dev 4 function 0 "S3 86C864-1" rev 0x00
vga1: aperture needed
wsdisplay0 at vga1 mux 1: console (80x25, vt100 emulation)
wsdisplay0: screen 1-5 added (80x25, vt100 emulation)
fxp0 at pci1 dev 8 function 0 "Intel 82801GB LAN" rev 0x01, i82562: apic 4 int 20, address 00:17:31:10:f1:c8
inphy0 at fxp0 phy 1: i82562ET 10/100 PHY, rev. 0
ichpcib0 at pci0 dev 31 function 0 "Intel 82801GH LPC" rev 0x01: PM disabled
pciide0 at pci0 dev 31 function 1 "Intel 82801GB IDE" rev 0x01: DMA, channel 0 configured to compatibility, channel 1 configured to compatibility
wd0 at pciide0 channel 0 drive 0: <WDC WD800JB-00JJC0>
wd0: 16-sector PIO, LBA, 76319MB, 156301488 sectors
atapiscsi0 at pciide0 channel 0 drive 1
scsibus1 at atapiscsi0: 2 targets
cd0 at scsibus1 targ 0 lun 0: <TSSTcorp, DVD-ROM TS-H352C, HP02> ATAPI 5/cdrom removable
wd0(pciide0:0:0): using PIO mode 4, Ultra-DMA mode 2
cd0(pciide0:0:1): using PIO mode 4, Ultra-DMA mode 2
pciide0: channel 1 ignored (disabled)
pciide1 at pci0 dev 31 function 2 "Intel 82801GB SATA" rev 0x01: DMA, channel 0 configured to native-PCI, channel 1 configured to native-PCI
pciide1: using apic 4 int 19 for native-PCI interrupt
ichiic0 at pci0 dev 31 function 3 "Intel 82801GB SMBus" rev 0x01: apic 4 int 19
iic0 at ichiic0
adt0 at iic0 addr 0x2e: sch5017 rev 0x8a
spdmem0 at iic0 addr 0x50: 1GB DDR2 SDRAM non-parity PC2-4200CL5
spdmem1 at iic0 addr 0x52: 1GB DDR2 SDRAM non-parity PC2-4200CL5
usb1 at uhci0: USB revision 1.0
uhub1 at usb1 "Intel UHCI root hub" rev 1.00/1.00 addr 1
usb2 at uhci1: USB revision 1.0
uhub2 at usb2 "Intel UHCI root hub" rev 1.00/1.00 addr 1
usb3 at uhci2: USB revision 1.0
uhub3 at usb3 "Intel UHCI root hub" rev 1.00/1.00 addr 1
usb4 at uhci3: USB revision 1.0
uhub4 at usb4 "Intel UHCI root hub" rev 1.00/1.00 addr 1
isa0 at ichpcib0
isadma0 at isa0
pckbc0 at isa0 port 0x60/5
pckbd0 at pckbc0 (kbd slot)
pckbc0: using irq 1 for kbd slot
wskbd0 at pckbd0: console keyboard, using wsdisplay0
pcppi0 at isa0 port 0x61
spkr0 at pcppi0
lpt0 at isa0 port 0x378/4 irq 7
npx0 at isa0 port 0xf0/16: reported by CPUID; using exception 16
umass0 at uhub0 port 6 configuration 1 interface 0 "Verbatim STORE N GO" rev 2.00/1.00 addr 2
umass0: using SCSI over Bulk-Only
scsibus2 at umass0: 2 targets, initiator 0
sd0 at scsibus2 targ 1 lun 0: <Verbatim, STORE N GO, 5.00> SCSI4 0/direct removable serial.18a50302542D13279242
sd0: 14788MB, 512 bytes/sector, 30286016 sectors
uhub5 at uhub3 port 1 "Lite-On Technology USB 1.1 2port downstream low power hub" rev 1.10/1.00 addr 2
uhidev0 at uhub5 port 1 configuration 1 interface 0 "Lite-On Technology USB Productivity Option Keyboard( has the hub in # 1 )" rev 1.10/1.00 addr 3
uhidev0: iclass 3/1
ukbd0 at uhidev0: 8 variable keys, 6 key codes
wskbd1 at ukbd0 mux 1
wskbd1: connecting to wsdisplay0
uhidev1 at uhub5 port 1 configuration 1 interface 1 "Lite-On Technology USB Productivity Option Keyboard( has the hub in # 1 )" rev 1.10/1.00 addr 3
uhidev1: iclass 3/0, 3 report ids
uhid0 at uhidev1 reportid 3: input=3, output=0, feature=0
uhidev2 at uhub5 port 2 configuration 1 interface 0 "Primax Electronics USB Optical Mouse" rev 2.00/2.00 addr 4
uhidev2: iclass 3/1
ums0 at uhidev2: 3 buttons, Z dir
wsmouse0 at ums0 mux 0
umass1 at uhub4 port 1 configuration 1 interface 0 " USB Reader" rev 1.10/1.00 addr 2
umass1: using SCSI over Bulk-Only
scsibus3 at umass1: 2 targets, initiator 0
sd1 at scsibus3 targ 1 lun 0: <Generic, USB SD Reader, 1.00> SCSI0 0/direct removable
sd2 at scsibus3 targ 1 lun 1: <Generic, USB CF Reader, 1.01> SCSI0 0/direct removable
sd3 at scsibus3 targ 1 lun 2: <Generic, USB SM Reader, 1.02> SCSI0 0/direct removable
sd4 at scsibus3 targ 1 lun 3: <Generic, USB MS Reader, 1.03> SCSI0 0/direct removable
vscsi0 at root
scsibus4 at vscsi0: 256 targets
softraid0 at root
scsibus5 at softraid0: 256 targets
root on sd0a (5f3fac92f8101a62.a) swap on sd0b dump on sd0b
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Old 2 Weeks Ago
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Could you give us something newer? Like 6.4 or -current?
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Yes, I would be glad to. But it may take some number of days, I'm not sure as there are many issues. 6.4 amd64 MP sounds like the thing to try. I'll post the update when done.
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Well, after the usual (for me) bizarre struggles, I got one of -release :

Code:
OpenBSD 6.4 (GENERIC.MP) #364: Thu Oct 11 13:30:23 MDT 2018
    deraadt@amd64.openbsd.org:/usr/src/sys/arch/amd64/compile/GENERIC.MP
real mem = 2129522688 (2030MB)
avail mem = 2055782400 (1960MB)
mpath0 at root
scsibus0 at mpath0: 256 targets
mainbus0 at root
bios0 at mainbus0: SMBIOS rev. 2.4 @ 0xf0000 (58 entries)
bios0: vendor Phoenix Technologies, LTD version "3.15" date 06/23/2006
bios0: HP Pavilion 061 ER881AA-ABA M7467C
acpi0 at bios0: rev 0
acpi0: sleep states S0 S1 S3 S4 S5
acpi0: tables DSDT FACP MCFG APIC
acpi0: wakeup devices PEX0(S5) PEX1(S5) PEX2(S5) PEX3(S5) PEX4(S5) PEX5(S5) HUB0(S5) USB0(S3) USB1(S3) USB2(S3) USB3(S3) USBE(S3) AC97(S5) AZAL(S5) PCI0(S5)
acpitimer0 at acpi0: 3579545 Hz, 24 bits
acpimcfg0 at acpi0
acpimcfg0: addr 0xf0000000, bus 0-255
acpimadt0 at acpi0 addr 0xfee00000: PC-AT compat
cpu0 at mainbus0: apid 0 (boot processor)
cpu0: Intel(R) Pentium(R) D CPU 3.20GHz, 3201.36 MHz, 0f-06-02
cpu0: FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE,SSE3,DTES64,MWAIT,DS-CPL,VMX,CNXT-ID,CX16,xTPR,PDCM,NXE,LONG,LAHF,MELTDOWN
cpu0: 2MB 64b/line 8-way L2 cache
cpu0: smt 0, core 0, package 0
mtrr: Pentium Pro MTRR support, 8 var ranges, 88 fixed ranges
cpu0: apic clock running at 290MHz
cpu0: mwait min=64, max=64
cpu1 at mainbus0: apid 1 (application processor)
cpu1: Intel(R) Pentium(R) D CPU 3.20GHz, 4641.32 MHz, 0f-06-02
cpu1: FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE,SSE3,DTES64,MWAIT,DS-CPL,VMX,CNXT-ID,CX16,xTPR,PDCM,NXE,LONG,LAHF,MELTDOWN
cpu1: 2MB 64b/line 8-way L2 cache
cpu1: smt 0, core 1, package 0
ioapic0 at mainbus0: apid 4 pa 0xfec00000, version 20, 24 pins, remapped
acpiprt0 at acpi0: bus 0 (PCI0)
acpiprt1 at acpi0: bus -1 (PEX0)
acpiprt2 at acpi0: bus -1 (PEX1)
acpiprt3 at acpi0: bus -1 (PEX2)
acpiprt4 at acpi0: bus -1 (PEX3)
acpiprt5 at acpi0: bus -1 (PEX4)
acpiprt6 at acpi0: bus -1 (PEX5)
acpiprt7 at acpi0: bus 1 (HUB0)
acpicpu0 at acpi0: C1(@1 halt!)
acpicpu1 at acpi0: C1(@1 halt!)
acpitz0 at acpi0: critical temperature is 75 degC
"AWY0001" at acpi0 not configured
acpibtn0 at acpi0: PWRB
acpicmos0 at acpi0
"PNP0C0B" at acpi0 not configured
pci0 at mainbus0 bus 0
pchb0 at pci0 dev 0 function 0 "Intel 82945G Host" rev 0x81
azalia0 at pci0 dev 27 function 0 "Intel 82801GB HD Audio" rev 0x01: msi
azalia0: codecs: Realtek ALC882
audio0 at azalia0
uhci0 at pci0 dev 29 function 0 "Intel 82801GB USB" rev 0x01: apic 4 int 23
uhci1 at pci0 dev 29 function 1 "Intel 82801GB USB" rev 0x01: apic 4 int 19
uhci2 at pci0 dev 29 function 2 "Intel 82801GB USB" rev 0x01: apic 4 int 18
uhci3 at pci0 dev 29 function 3 "Intel 82801GB USB" rev 0x01: apic 4 int 16
ehci0 at pci0 dev 29 function 7 "Intel 82801GB USB" rev 0x01: apic 4 int 23
usb0 at ehci0: USB revision 2.0
uhub0 at usb0 configuration 1 interface 0 "Intel EHCI root hub" rev 2.00/1.00 addr 1
ppb0 at pci0 dev 30 function 0 "Intel 82801BA Hub-to-PCI" rev 0xe1
pci1 at ppb0 bus 1
"VIA VT6306 FireWire" rev 0x80 at pci1 dev 1 function 0 not configured
vga1 at pci1 dev 4 function 0 "S3 86C864-1" rev 0x00
wsdisplay0 at vga1 mux 1: console (80x25, vt100 emulation)
wsdisplay0: screen 1-5 added (80x25, vt100 emulation)
fxp0 at pci1 dev 8 function 0 "Intel 82801GB LAN" rev 0x01, i82562: apic 4 int 20, address 00:17:31:10:f1:c8
inphy0 at fxp0 phy 1: i82562ET 10/100 PHY, rev. 0
pcib0 at pci0 dev 31 function 0 "Intel 82801GH LPC" rev 0x01
pciide0 at pci0 dev 31 function 1 "Intel 82801GB IDE" rev 0x01: DMA, channel 0 configured to compatibility, channel 1 configured to compatibility
wd0 at pciide0 channel 0 drive 0: <WDC WD800JB-00JJC0>
wd0: 16-sector PIO, LBA, 76319MB, 156301488 sectors
atapiscsi0 at pciide0 channel 0 drive 1
scsibus1 at atapiscsi0: 2 targets
cd0 at scsibus1 targ 0 lun 0: <TSSTcorp, DVD-ROM TS-H352C, HP02> ATAPI 5/cdrom removable
wd0(pciide0:0:0): using PIO mode 4, Ultra-DMA mode 2
cd0(pciide0:0:1): using PIO mode 4, Ultra-DMA mode 2
pciide0: channel 1 ignored (disabled)
pciide1 at pci0 dev 31 function 2 "Intel 82801GB SATA" rev 0x01: DMA, channel 0 configured to native-PCI, channel 1 configured to native-PCI
pciide1: using apic 4 int 19 for native-PCI interrupt
ichiic0 at pci0 dev 31 function 3 "Intel 82801GB SMBus" rev 0x01: apic 4 int 19
iic0 at ichiic0
adt0 at iic0 addr 0x2e: sch5017 rev 0x8a
spdmem0 at iic0 addr 0x50: 1GB DDR2 SDRAM non-parity PC2-4200CL5
spdmem1 at iic0 addr 0x52: 1GB DDR2 SDRAM non-parity PC2-4200CL5
usb1 at uhci0: USB revision 1.0
uhub1 at usb1 configuration 1 interface 0 "Intel UHCI root hub" rev 1.00/1.00 addr 1
usb2 at uhci1: USB revision 1.0
uhub2 at usb2 configuration 1 interface 0 "Intel UHCI root hub" rev 1.00/1.00 addr 1
usb3 at uhci2: USB revision 1.0
uhub3 at usb3 configuration 1 interface 0 "Intel UHCI root hub" rev 1.00/1.00 addr 1
usb4 at uhci3: USB revision 1.0
uhub4 at usb4 configuration 1 interface 0 "Intel UHCI 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: console keyboard, using wsdisplay0
pcppi0 at isa0 port 0x61
spkr0 at pcppi0
lpt0 at isa0 port 0x378/4 irq 7
vmm0 at mainbus0: VMX (using slow L1TF mitigation)
acpitz0: _AL0[0] _PR0 failed
umass0 at uhub0 port 6 configuration 1 interface 0 "Verbatim STORE N GO" rev 2.00/1.00 addr 2
umass0: using SCSI over Bulk-Only
scsibus2 at umass0: 2 targets, initiator 0
sd0 at scsibus2 targ 1 lun 0: <Verbatim, STORE N GO, 5.00> SCSI4 0/direct removable serial.18a50302542D13279242
sd0: 14788MB, 512 bytes/sector, 30286016 sectors
uhub5 at uhub3 port 1 configuration 1 interface 0 "Lite-On Technology USB 1.1 2port downstream low power hub" rev 1.10/1.00 addr 2
uhidev0 at uhub5 port 1 configuration 1 interface 0 "Lite-On Technology USB Productivity Option Keyboard( has the hub in # 1 )" rev 1.10/1.00 addr 3
uhidev0: iclass 3/1
ukbd0 at uhidev0: 8 variable keys, 6 key codes
wskbd1 at ukbd0 mux 1
wskbd1: connecting to wsdisplay0
uhidev1 at uhub5 port 1 configuration 1 interface 1 "Lite-On Technology USB Productivity Option Keyboard( has the hub in # 1 )" rev 1.10/1.00 addr 3
uhidev1: iclass 3/0, 3 report ids
uhid0 at uhidev1 reportid 3: input=3, output=0, feature=0
umass1 at uhub4 port 1 configuration 1 interface 0 " USB Reader" rev 1.10/1.00 addr 2
umass1: using SCSI over Bulk-Only
scsibus3 at umass1: 2 targets, initiator 0
sd1 at scsibus3 targ 1 lun 0: <Generic, USB SD Reader, 1.00> SCSI0 0/direct removable
sd2 at scsibus3 targ 1 lun 1: <Generic, USB CF Reader, 1.01> SCSI0 0/direct removable
sd3 at scsibus3 targ 1 lun 2: <Generic, USB SM Reader, 1.02> SCSI0 0/direct removable
sd4 at scsibus3 targ 1 lun 3: <Generic, USB MS Reader, 1.03> SCSI0 0/direct removable
vscsi0 at root
scsibus4 at vscsi0: 256 targets
softraid0 at root
scsibus5 at softraid0: 256 targets
root on sd0a (77f6ab688946ed16.a) swap on sd0b dump on sd0b
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ibara ibara is offline
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OK, so you have a dual core CPU that is theoretically capable of hyperthreading, but in fact has no smt on the cores themselves.

You should be able to confirm this by running top(1) on 6.4 or -current and noticing that there is activity on both cores during normal use.
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Thanks for reviewing that and explaining.

Quote:
Originally Posted by ibara View Post
OK, so you have a dual core CPU that is theoretically capable of hyperthreading, but in fact has no smt on the cores themselves.
I don't know very much about these things, but that makes sense. So in terms of practical implications, I would guess

(a) since there is no hyper-threading going on, no need to worry about the associated vulnerability;

(b) if there was a hypothetical CPU like this which did have hyper-threaded cores, then top, and the dmesg, would show cpu0 through cpu3 ?

Actually I have 3 other PCs with Pentium 4 variants. One has hyper-threading (though I recently turned it off). One would have had hyper-threading, but Intel disabled it to make it cheaper. The other doesn't. I should check what OpenBSD dmesg says about HTT for all of these.

Quote:
You should be able to confirm this by running top(1) on 6.4 or -current and noticing that there is activity on both cores during normal use.
I will try that maybe tomorrow. One problem is, to run this machine I need to bring it and the monitor & keyboard into another room, set it up, then take it away again when done ... progress can be slow.
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Yup:

Code:
load averages:  0.08,  0.03,  0.01                                                          xxxxxx.lan 12:27:45
36 processes: 35 idle, 1 on processor                                                                  up  0:09
CPU0 states:  0.4% user,  0.0% nice,  1.6% sys,  0.2% spin,  0.2% intr, 97.6% idle
CPU1 states:  0.2% user,  0.0% nice,  0.4% sys,  0.0% spin,  0.0% intr, 99.4% idle
Memory: Real: 44M/427M act/tot Free: 1542M Cache: 302M Swap: 0K/81M

  PID USERNAME PRI NICE  SIZE   RES STATE     WAIT      TIME    CPU COMMAND
89158 root      -6    0   18M   19M sleep/0   bqwait    0:00  0.29% objcopy
    1 root      10    0  396K  448K idle      wait      0:01  0.00% init
44666 root      18    0 2432K 4872K idle      pause     0:00  0.00% make
21328 _smtpd     2    0 1460K 3768K idle      kqread    0:00  0.00% smtpd
...
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Old 2 Weeks Ago
ibara's Avatar
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By the way, the magic lines are
Code:
cpu0: smt 0, core 0, package 0
and
Code:
cpu1: smt 0, core 1, package 0
When smt is marked 0, it's a real core. When it's 1, that's the hyperthread core.
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Excellent, that is great to know about!
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I agree, great info!

BTW, it's exactly the same situation with the C2D in my 2009 macbook: HTT indicated and smt 0.
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Quote:
The last generation of Pentium D branded processors was Presler identified by the product code 80553, and made of two 65 nm-process cores found also in Pentium 4 branded Cedar Mill CPUs. Presler introduced the 'multi-chip module, or MCM, which consisted of two single-core dies placed next to each other on the same substrate package.
https://en.wikipedia.org/wiki/Pentium_D#Presler

So, no hyperthreading.
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Quote:
Originally Posted by hrsetrdr View Post
So, no hyperthreading.
Agreed, that was one of the indications against the presence of hyper-threading.

----

A quote from the article about the PortSmash Attack linked by fvgit in the News thread:

Quote:
Originally Posted by Billy Brumley
"This is the main reason we released the exploit -- to show how reproducible it is," Brumley told us, "and help to kill off the SMT trend in chips." ...""I hope our work encourages users to disable SMT in the BIOS or choose to spend their money on architectures not featuring SMT."
It looks like this 2006 Pentium D is well ahead of the times.
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