The latest amd64 snapshots have ACPI enabled. On my Shuttle SN25P, with an AMD dual core processor, this leads to a significant decrease in performance. For example, given the same bsd.mp kernel on an unloaded system, here's a time'd compile of an application with ACPI disabled:
gmake 50.99s user 7.26s system 92% cpu 1:03.29 total and with ACPI enabled: gmake 53.05s user 10.81s system 73% cpu 1:26.57 total As you can see, enabling ACPI leads to a more-or-less 50% slowdown. I did file an informal report about this same issue in January, so I don't think this is a new problem. With ACPI enabled, even when the machine is idle top shows that one processor is fairly continuously spending 60-70% of its time processing interrupts. In use, the machine feels really sluggish, as if using a machine from several years back. Disabling ACPI at UKC is all that is needed to restore performance. Here's the dmesg with ACPI disabled: OpenBSD 4.1-current (GENERIC.MP) #1286: Thu Jun 7 00:52:32 MDT 2007 [EMAIL PROTECTED]:/usr/src/sys/arch/amd64/compile/GENERIC.MP real mem = 1073278976 (1023MB) avail mem = 1025142784 (977MB) User Kernel Config UKC> disable acpi 263 acpi0 disabled UKC> quit Continuing... mainbus0 at root bios0 at mainbus0: SMBIOS rev. 2.2 @ 0xf0000 (32 entries) bios0: Shuttle Inc SN25V10 acpi at mainbus0 not configured mainbus0: Intel MP Specification (Version 1.1) cpu0 at mainbus0: apid 0 (boot processor) cpu0: AMD Athlon(tm) 64 X2 Dual Core Processor 4200+, 2210.47 MHz cpu0: FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,MMX,FXSR,SSE,SSE2,HTT,SSE3,NXE,MMXX,FFXSR,LONG,3DNOW2,3DNOW cpu0: 64KB 64b/line 2-way I-cache, 64KB 64b/line 2-way D-cache, 512KB 64b/line 16-way L2 cache cpu0: ITLB 32 4KB entries fully associative, 8 4MB entries fully associative cpu0: DTLB 32 4KB entries fully associative, 8 4MB entries fully associative cpu0: apic clock running at 200MHz cpu1 at mainbus0: apid 1 (application processor) cpu1: AMD Athlon(tm) 64 X2 Dual Core Processor 4200+, 2210.19 MHz cpu1: FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,MMX,FXSR,SSE,SSE2,HTT,SSE3,NXE,MMXX,FFXSR,LONG,3DNOW2,3DNOW cpu1: 64KB 64b/line 2-way I-cache, 64KB 64b/line 2-way D-cache, 512KB 64b/line 16-way L2 cache cpu1: ITLB 32 4KB entries fully associative, 8 4MB entries fully associative cpu1: DTLB 32 4KB entries fully associative, 8 4MB entries fully associative mpbios: bus 0 is type PCI mpbios: bus 1 is type PCI mpbios: bus 2 is type PCI mpbios: bus 3 is type PCI mpbios: bus 4 is type PCI mpbios: bus 5 is type PCI mpbios: bus 6 is type ISA ioapic0 at mainbus0 apid 2 pa 0xfec00000, version 11, 24 pins ioapic0: misconfigured as apic 0, remapped to apid 2 pci0 at mainbus0 bus 0: configuration mode 1 "NVIDIA nForce4 DDR" rev 0xa3 at pci0 dev 0 function 0 not configured pcib0 at pci0 dev 1 function 0 "NVIDIA nForce4 ISA" rev 0xa3 nviic0 at pci0 dev 1 function 1 "NVIDIA nForce4 SMBus" rev 0xa2 iic0 at nviic0 iic1 at nviic0 adt0 at iic1 addr 0x2e: adm1027 rev 0x6a iic1: addr 0x4e 03=08 04=08 12=fd 13=0f 28=83 29=12 2a=12 2b=28 ohci0 at pci0 dev 2 function 0 "NVIDIA nForce4 USB" rev 0xa2: apic 2 int 11 (irq 11), version 1.0, legacy support pciide0 at pci0 dev 6 function 0 "NVIDIA nForce4 IDE" rev 0xf2: DMA, channel 0 configured to compatibility, channel 1 configured to compatibility atapiscsi0 at pciide0 channel 0 drive 0 scsibus0 at atapiscsi0: 2 targets cd0 at scsibus0 targ 0 lun 0: <SONY, CD-RW CRX320EE, RYK3> SCSI0 5/cdrom removable cd0(pciide0:0:0): using PIO mode 4, Ultra-DMA mode 2 pciide0: channel 1 ignored (disabled) pciide1 at pci0 dev 7 function 0 "NVIDIA nForce4 SATA" rev 0xf3: DMA pciide1: using apic 2 int 10 (irq 10) for native-PCI interrupt wd0 at pciide1 channel 0 drive 0: <WDC WD1500ADFD-00NLR0> wd0: 16-sector PIO, LBA48, 143089MB, 293046768 sectors wd0(pciide1:0:0): using PIO mode 4, Ultra-DMA mode 5 pciide2 at pci0 dev 8 function 0 "NVIDIA nForce4 SATA" rev 0xf3: DMA pciide2: using apic 2 int 11 (irq 11) for native-PCI interrupt ppb0 at pci0 dev 9 function 0 "NVIDIA nForce4 PCI-PCI" rev 0xa2 pci1 at ppb0 bus 5 "IC Ensemble Envy24PT/HT Audio" rev 0x01 at pci1 dev 6 function 0 not configured "VIA VT6306 FireWire" rev 0x80 at pci1 dev 7 function 0 not configured nfe0 at pci0 dev 10 function 0 "NVIDIA CK804 LAN" rev 0xa3: apic 2 int 5 (irq 5), address 00:30:1b:b9:05:6c eephy0 at nfe0 phy 1: Marvell 88E1111 Gigabit PHY, rev. 2 ppb1 at pci0 dev 11 function 0 "NVIDIA nForce4 PCIE" rev 0xa3 pci2 at ppb1 bus 4 ppb2 at pci0 dev 12 function 0 "NVIDIA nForce4 PCIE" rev 0xa3 pci3 at ppb2 bus 3 ppb3 at pci0 dev 13 function 0 "NVIDIA nForce4 PCIE" rev 0xa3 pci4 at ppb3 bus 2 ppb4 at pci0 dev 14 function 0 "NVIDIA nForce4 PCIE" rev 0xa3 pci5 at ppb4 bus 1 vga1 at pci5 dev 0 function 0 "NVIDIA GeForce 6600" rev 0xa2 wsdisplay0 at vga1 mux 1: console (80x25, vt100 emulation) wsdisplay0: screen 1-5 added (80x25, vt100 emulation) pchb0 at pci0 dev 24 function 0 "AMD AMD64 HyperTransport" rev 0x00 pchb1 at pci0 dev 24 function 1 "AMD AMD64 Address Map" rev 0x00 pchb2 at pci0 dev 24 function 2 "AMD AMD64 DRAM Cfg" rev 0x00 pchb3 at pci0 dev 24 function 3 "AMD AMD64 Misc Cfg" rev 0x00 isa0 at pcib0 isadma0 at isa0 com0 at isa0 port 0x3f8/8 irq 4: ns16550a, 16 byte fifo 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 midi0 at pcppi0: <PC speaker> spkr0 at pcppi0 lpt0 at isa0 port 0x378/4 irq 7 it0 at isa0 port 0x290/8: IT87 fdc0 at isa0 port 0x3f0/6 irq 6 drq 2 usb0 at ohci0: USB revision 1.0 uhub0 at usb0: NVIDIA OHCI root hub, rev 1.00/1.00, addr 1 uaudio0 at uhub0 port 1 configuration 1 interface 0: ABC C-Media USB Headphone Set, rev 1.10/1.00, addr 2 uaudio0: audio rev 1.00, 8 mixer controls audio0 at uaudio0 uhidev0 at uhub0 port 1 configuration 1 interface 3 uhidev0: ABC C-Media USB Headphone Set, rev 1.10/1.00, addr 2, iclass 3/0 uhid0 at uhidev0: input=4, output=4, feature=0 uhub1 at uhub0 port 2: ATEN International product 0x7000, rev 1.10/1.00, addr 3 uhidev1 at uhub1 port 1 configuration 1 interface 0 uhidev1: MALTRON USB Multimedia Keyboard, rev 1.10/1.22, addr 4, iclass 3/1 ukbd0 at uhidev1: 8 modifier keys, 6 key codes, country code 13 wskbd1 at ukbd0 mux 1 wskbd1: connecting to wsdisplay0 uhidev2 at uhub1 port 1 configuration 1 interface 1 uhidev2: MALTRON USB Multimedia Keyboard, rev 1.10/1.22, addr 4, iclass 3/0 uhidev2: no report descriptor uhidev3 at uhub1 port 4 configuration 1 interface 0 uhidev3: Logitech Trackball, rev 1.10/2.20, addr 5, iclass 3/1 ums0 at uhidev3: 3 buttons and Z dir. wsmouse0 at ums0 mux 0 axe0 at uhub0 port 3 configuration 1 interface 0 axe0: USB Linksys USB2.0 Network Adapter, rev 2.00/0.01, addr 6, AX88172, address 00:13:10:dc:46:07 rlphy0 at axe0 phy 3: RTL8201L 10/100 PHY, rev. 1 cdce0 at uhub0 port 4 configuration 1 interface 1 cdce0: AMBIT NTL USB Cable Modem, rev 1.10/1.01, addr 7 cdce0: could not find data bulk in cdce1 at uhub0 port 4 configuration 1 interface 0 cdce1: AMBIT NTL USB Cable Modem, rev 1.10/1.01, addr 7 cdce1: address 2a:cb:60:02:00:00 softraid0 at root dkcsum: wd0 matches BIOS drive 0x80 root on wd0a swap on wd0b dump on wd0b and the dmesg with ACPI enabled (the default): OpenBSD 4.1-current (GENERIC.MP) #1286: Thu Jun 7 00:52:32 MDT 2007 [EMAIL PROTECTED]:/usr/src/sys/arch/amd64/compile/GENERIC.MP real mem = 1073278976 (1023MB) avail mem = 1025142784 (977MB) mainbus0 at root bios0 at mainbus0: SMBIOS rev. 2.2 @ 0xf0000 (32 entries) bios0: Shuttle Inc SN25V10 acpi0 at mainbus0: rev 0 acpi0: tables DSDT FACP SSDT MCFG APIC acpitimer at acpi0 not configured acpimadt0 at acpi0 addr 0xfee00000: PC-AT compat cpu0 at mainbus0: apid 0 (boot processor) cpu0: AMD Athlon(tm) 64 X2 Dual Core Processor 4200+, 2210.43 MHz cpu0: FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,MMX,FXSR,SSE,SSE2,HTT,SSE3,NXE,MMXX,FFXSR,LONG,3DNOW2,3DNOW cpu0: 64KB 64b/line 2-way I-cache, 64KB 64b/line 2-way D-cache, 512KB 64b/line 16-way L2 cache cpu0: ITLB 32 4KB entries fully associative, 8 4MB entries fully associative cpu0: DTLB 32 4KB entries fully associative, 8 4MB entries fully associative cpu0: apic clock running at 200MHz cpu1 at mainbus0: apid 1 (application processor) cpu1: AMD Athlon(tm) 64 X2 Dual Core Processor 4200+, 2210.19 MHz cpu1: FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,MMX,FXSR,SSE,SSE2,HTT,SSE3,NXE,MMXX,FFXSR,LONG,3DNOW2,3DNOW cpu1: 64KB 64b/line 2-way I-cache, 64KB 64b/line 2-way D-cache, 512KB 64b/line 16-way L2 cache cpu1: ITLB 32 4KB entries fully associative, 8 4MB entries fully associative cpu1: DTLB 32 4KB entries fully associative, 8 4MB entries fully associative ioapic0 at mainbus0 apid 2 pa 0xfec00000, version 11, 24 pins ioapic0: misconfigured as apic 0, remapped to apid 2 acpiprt0 at acpi0: bus 0 (PCI0) acpiprt1 at acpi0: bus 5 (HUB0) acpicpu at acpi0 not configured acpicpu at acpi0 not configured acpitz at acpi0 not configured acpibtn at acpi0 not configured pci0 at mainbus0 bus 0: configuration mode 1 "NVIDIA nForce4 DDR" rev 0xa3 at pci0 dev 0 function 0 not configured pcib0 at pci0 dev 1 function 0 "NVIDIA nForce4 ISA" rev 0xa3 nviic0 at pci0 dev 1 function 1 "NVIDIA nForce4 SMBus" rev 0xa2 iic0 at nviic0 iic1 at nviic0 adt0 at iic1 addr 0x2e: adm1027 rev 0x6a iic1: addr 0x4e 03=08 04=08 12=fd 13=0f 28=83 29=12 2a=12 2b=28 ohci0 at pci0 dev 2 function 0 "NVIDIA nForce4 USB" rev 0xa2: apic 2 int 0 (irq 11), version 1.0, legacy support pciide0 at pci0 dev 6 function 0 "NVIDIA nForce4 IDE" rev 0xf2: DMA, channel 0 configured to compatibility, channel 1 configured to compatibility atapiscsi0 at pciide0 channel 0 drive 0 scsibus0 at atapiscsi0: 2 targets cd0 at scsibus0 targ 0 lun 0: <SONY, CD-RW CRX320EE, RYK3> SCSI0 5/cdrom removable cd0(pciide0:0:0): using PIO mode 4, Ultra-DMA mode 2 pciide0: channel 1 ignored (disabled) pciide1 at pci0 dev 7 function 0 "NVIDIA nForce4 SATA" rev 0xf3: DMA pciide1: using apic 2 int 0 (irq 10) for native-PCI interrupt wd0 at pciide1 channel 0 drive 0: <WDC WD1500ADFD-00NLR0> wd0: 16-sector PIO, LBA48, 143089MB, 293046768 sectors wd0(pciide1:0:0): using PIO mode 4, Ultra-DMA mode 5 pciide2 at pci0 dev 8 function 0 "NVIDIA nForce4 SATA" rev 0xf3: DMA pciide2: using apic 2 int 0 (irq 11) for native-PCI interrupt ppb0 at pci0 dev 9 function 0 "NVIDIA nForce4 PCI-PCI" rev 0xa2 pci1 at ppb0 bus 5 "IC Ensemble Envy24PT/HT Audio" rev 0x01 at pci1 dev 6 function 0 not configured "VIA VT6306 FireWire" rev 0x80 at pci1 dev 7 function 0 not configured nfe0 at pci0 dev 10 function 0 "NVIDIA CK804 LAN" rev 0xa3: apic 2 int 0 (irq 5), address 00:30:1b:b9:05:6c eephy0 at nfe0 phy 1: Marvell 88E1111 Gigabit PHY, rev. 2 ppb1 at pci0 dev 11 function 0 "NVIDIA nForce4 PCIE" rev 0xa3 pci2 at ppb1 bus 4 ppb2 at pci0 dev 12 function 0 "NVIDIA nForce4 PCIE" rev 0xa3 pci3 at ppb2 bus 3 ppb3 at pci0 dev 13 function 0 "NVIDIA nForce4 PCIE" rev 0xa3 pci4 at ppb3 bus 2 ppb4 at pci0 dev 14 function 0 "NVIDIA nForce4 PCIE" rev 0xa3 pci5 at ppb4 bus 1 vga1 at pci5 dev 0 function 0 "NVIDIA GeForce 6600" rev 0xa2 wsdisplay0 at vga1 mux 1: console (80x25, vt100 emulation) wsdisplay0: screen 1-5 added (80x25, vt100 emulation) pchb0 at pci0 dev 24 function 0 "AMD AMD64 HyperTransport" rev 0x00 pchb1 at pci0 dev 24 function 1 "AMD AMD64 Address Map" rev 0x00 pchb2 at pci0 dev 24 function 2 "AMD AMD64 DRAM Cfg" rev 0x00 pchb3 at pci0 dev 24 function 3 "AMD AMD64 Misc Cfg" rev 0x00 isa0 at pcib0 isadma0 at isa0 com0 at isa0 port 0x3f8/8 irq 4: ns16550a, 16 byte fifo 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 midi0 at pcppi0: <PC speaker> spkr0 at pcppi0 lpt0 at isa0 port 0x378/4 irq 7 it0 at isa0 port 0x290/8: IT87 fdc0 at isa0 port 0x3f0/6 irq 6 drq 2 usb0 at ohci0: USB revision 1.0 uhub0 at usb0: NVIDIA OHCI root hub, rev 1.00/1.00, addr 1 uaudio0 at uhub0 port 1 configuration 1 interface 0: ABC C-Media USB Headphone Set, rev 1.10/1.00, addr 2 uaudio0: audio rev 1.00, 8 mixer controls audio0 at uaudio0 uhidev0 at uhub0 port 1 configuration 1 interface 3 uhidev0: ABC C-Media USB Headphone Set, rev 1.10/1.00, addr 2, iclass 3/0 uhid0 at uhidev0: input=4, output=4, feature=0 uhub1 at uhub0 port 2: ATEN International product 0x7000, rev 1.10/1.00, addr 3 uhidev1 at uhub1 port 1 configuration 1 interface 0 uhidev1: MALTRON USB Multimedia Keyboard, rev 1.10/1.22, addr 4, iclass 3/1 ukbd0 at uhidev1: 8 modifier keys, 6 key codes, country code 13 wskbd1 at ukbd0 mux 1 wskbd1: connecting to wsdisplay0 uhidev2 at uhub1 port 1 configuration 1 interface 1 uhidev2: MALTRON USB Multimedia Keyboard, rev 1.10/1.22, addr 4, iclass 3/0 uhidev2: 3 report ids uhid1 at uhidev2 reportid 2: input=1, output=0, feature=0 uhid2 at uhidev2 reportid 3: input=2, output=0, feature=0 uhidev3 at uhub1 port 4 configuration 1 interface 0 uhidev3: Logitech Trackball, rev 1.10/2.20, addr 5, iclass 3/1 ums0 at uhidev3: 3 buttons and Z dir. wsmouse0 at ums0 mux 0 axe0 at uhub0 port 3 configuration 1 interface 0 axe0: USB Linksys USB2.0 Network Adapter, rev 2.00/0.01, addr 6, AX88172, address 00:13:10:dc:46:07 rlphy0 at axe0 phy 3: RTL8201L 10/100 PHY, rev. 1 cdce0 at uhub0 port 4 configuration 1 interface 1 cdce0: AMBIT NTL USB Cable Modem, rev 1.10/1.01, addr 7 cdce0: could not find data bulk in cdce1 at uhub0 port 4 configuration 1 interface 0 cdce1: AMBIT NTL USB Cable Modem, rev 1.10/1.01, addr 7 cdce1: address 2a:cb:61:02:00:00 softraid0 at root dkcsum: wd0 matches BIOS drive 0x80 root on wd0a swap on wd0b dump on wd0b In case it's relevant, here's a slightly chopped down diff between the two to highlight the differences: -acpi at mainbus0 not configured -mainbus0: Intel MP Specification (Version 1.1) +acpi0 at mainbus0: rev 0 +acpi0: tables DSDT FACP SSDT MCFG APIC +acpitimer at acpi0 not configured +acpimadt0 at acpi0 addr 0xfee00000: PC-AT compat cpu0 at mainbus0: apid 0 (boot processor) -cpu0: AMD Athlon(tm) 64 X2 Dual Core Processor 4200+, 2210.47 MHz +cpu0: AMD Athlon(tm) 64 X2 Dual Core Processor 4200+, 2210.43 MHz -mpbios: bus 0 is type PCI -mpbios: bus 1 is type PCI -mpbios: bus 2 is type PCI -mpbios: bus 3 is type PCI -mpbios: bus 4 is type PCI -mpbios: bus 5 is type PCI -mpbios: bus 6 is type ISA ioapic0 at mainbus0 apid 2 pa 0xfec00000, version 11, 24 pins ioapic0: misconfigured as apic 0, remapped to apid 2 +acpiprt0 at acpi0: bus 0 (PCI0) +acpiprt1 at acpi0: bus 5 (HUB0) +acpicpu at acpi0 not configured +acpicpu at acpi0 not configured +acpitz at acpi0 not configured +acpibtn at acpi0 not configured -ohci0 at pci0 dev 2 function 0 "NVIDIA nForce4 USB" rev 0xa2: apic 2 int 11 (irq 11), version 1.0, legacy support +ohci0 at pci0 dev 2 function 0 "NVIDIA nForce4 USB" rev 0xa2: apic 2 int 0 (irq 11), version 1.0, legacy support -pciide1: using apic 2 int 10 (irq 10) for native-PCI interrupt +pciide1: using apic 2 int 0 (irq 10) for native-PCI interrupt -pciide2: using apic 2 int 11 (irq 11) for native-PCI interrupt +pciide2: using apic 2 int 0 (irq 11) for native-PCI interrupt -nfe0 at pci0 dev 10 function 0 "NVIDIA CK804 LAN" rev 0xa3: apic 2 int 5 (irq 5), address 00:30:1b:b9:05:6c +nfe0 at pci0 dev 10 function 0 "NVIDIA CK804 LAN" rev 0xa3: apic 2 int 0 (irq 5), address 00:30:1b:b9:05:6c -uhidev2: no report descriptor +uhidev2: 3 report ids +uhid1 at uhidev2 reportid 2: input=1, output=0, feature=0 +uhid2 at uhidev2 reportid 3: input=2, output=0, feature=0 -cdce1: address 2a:cb:60:02:00:00 +cdce1: address 2a:cb:61:02:00:00 If anyone has any questions, please don't hesitate to contact me. Laurie -- http://tratt.net/laurie/ -- Personal http://convergepl.org/ -- The Converge programming language http://sosym.dcs.kcl.ac.uk/ -- Software and Systems Modelling Team