Hi, I was attempting to test temperatures under load by running "cat /dev/urandom > file" and I thought my system had crashed. Instantly when this command begins the system becomes very unresponsive. All input over ssh and keyboard attached to the machine has seemingly varying, but significant, amounts of lag.
I'm not sure what would be causing this behaviour or how to properly diagnose it. The system in question is using the Intel Atom D510MO motherboard ( http://www.intel.com/products/desktop/motherboards/D510MO/D510MO-overview.htm ). I'm not sure how relevant this is, but the top output seems to indicate something: load averages: 1.73, 0.97, 0.46 03:18:14 33 processes: 30 idle, 3 on processor CPU0 states: 0.0% user, 0.0% nice, 0.4% system, 99.6% interrupt, 0.0% idle CPU1 states: 0.0% user, 0.0% nice, 6.3% system, 53.6% interrupt, 40.1% idle CPU2 states: 0.0% user, 0.0% nice, 100% system, 0.0% interrupt, 0.0% idle CPU3 states: 0.0% user, 0.0% nice, 3.7% system, 50.5% interrupt, 45.8% idle Memory: Real: 10M/137M act/tot Free: 845M Swap: 0K/2051M used/tot PID USERNAME PRI NICE SIZE RES STATE WAIT TIME CPU COMMAND 16216 root -5 0 184K 148K sleep/2 getblk 11:18 1129.88% cat 15668 _ntp 56 0 708K 812K onproc/0 - 0:42 77.64% ntpd 2808 root 2 0 624K 724K sleep/3 poll 0:17 60.40% ntpd 6584 root 32 0 808K 1392K onproc/1 - 0:08 9.23% top 16545 root 32 0 968K 1420K onproc/3 - 0:04 8.15% sendmail 23931 will 2 0 3340K 1812K sleep/1 select 0:01 2.54% sshd 197 _syslogd 2 0 488K 644K sleep/1 poll 0:00 1.76% syslogd 2449 _pflogd 4 0 540K 292K sleep/3 bpf 0:01 1.71% pflogd 17554 will 2 0 3200K 1804K idle select 0:03 0.83% sshd This is after leaving the process running for a few minutes. top updates maybe once every minute while this goes on and the % cpu time slowly increases I'm aware this is a newish piece of equipment and may not be fully supported yet so I'm not sure if that is the reason or there is some bug here. Or that this is anything that should be too worried about. I initially found this behaviour on 4.6-release but then tried the Feb 23? (or which is on ftp as of a couple hours ago) snapshot. Same behaviour on both. Both were i386. I haven't yet tried amd64. Also, I tried a different test running infinite loops to max out all the CPUs and the system seemed to behave fine. Oh, I just tried the SP kernel while writing this and the problem only seems to occur when running the MP kernel. Sorry for the noise if I'm missing something. Here's the dmesg: OpenBSD 4.7-beta (GENERIC.MP) #423: Tue Feb 23 12:24:22 MST 2010 dera...@i386.openbsd.org:/usr/src/sys/arch/i386/compile/GENERIC.MP RTC BIOS diagnostic error 80<clock_battery> cpu0: Intel(R) Atom(TM) CPU D510 @ 1.66GHz ("GenuineIntel" 686-class) 1.67 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,SBF,SSE3,MWAIT,DS-CPL,TM2,CX16,xTPR real mem = 1055203328 (1006MB) avail mem = 1013702656 (966MB) RTC BIOS diagnostic error 80<clock_battery> mainbus0 at root bios0 at mainbus0: AT/286+ BIOS, date 11/17/09, SMBIOS rev. 2.5 @ 0xe4410 (25 entries) bios0: vendor Intel Corp. version "MOPNV10J.86A.0154.2009.1117.1624" date 11/17/2009 bios0: Intel Corporation D510MO acpi0 at bios0: rev 2 acpi0: tables DSDT FACP APIC MCFG HPET SSDT acpi0: wakeup devices SLPB(S4) PS2M(S4) PS2K(S4) UAR1(S4) UAR2(S4) P32_(S4) ILAN(S4) PEX0(S4) PEX1(S4) PEX2(S4) PEX3(S4) UHC1(S3) UHC2(S3) UHC3(S3) UHC4(S3) EHCI(S3) AZAL(S4) acpitimer0 at acpi0: 3579545 Hz, 24 bits acpimadt0 at acpi0 addr 0xfee00000: PC-AT compat cpu0 at mainbus0: apid 0 (boot processor) cpu0: apic clock running at 166MHz cpu1 at mainbus0: apid 1 (application processor) cpu1: Intel(R) Atom(TM) CPU D510 @ 1.66GHz ("GenuineIntel" 686-class) 1.67 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,SS,HTT,TM,SBF,SSE3,MWAIT,DS-CPL,TM2,CX16,xTPR cpu2 at mainbus0: apid 2 (application processor) cpu2: Intel(R) Atom(TM) CPU D510 @ 1.66GHz ("GenuineIntel" 686-class) 1.67 GHz cpu2: 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,SBF,SSE3,MWAIT,DS-CPL,TM2,CX16,xTPR cpu3 at mainbus0: apid 3 (application processor) cpu3: Intel(R) Atom(TM) CPU D510 @ 1.66GHz ("GenuineIntel" 686-class) 1.67 GHz cpu3: 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,SBF,SSE3,MWAIT,DS-CPL,TM2,CX16,xTPR ioapic0 at mainbus0: apid 8 pa 0xfec00000, version 20, 24 pins ioapic0: misconfigured as apic 0, remapped to apid 8 acpihpet0 at acpi0: 14318179 Hz acpiprt0 at acpi0: bus 5 (P32_) acpiprt1 at acpi0: bus 0 (PCI0) acpiprt2 at acpi0: bus 1 (PEX0) acpiprt3 at acpi0: bus 2 (PEX1) acpiprt4 at acpi0: bus 3 (PEX2) acpiprt5 at acpi0: bus 4 (PEX3) acpicpu0 at acpi0: C1, PSS acpicpu1 at acpi0: C1, PSS acpicpu2 at acpi0: C1, PSS acpicpu3 at acpi0: C1, PSS acpibtn0 at acpi0: SLPB bios0: ROM list: 0xc0000/0xda00! 0xce000/0x1000 pci0 at mainbus0 bus 0: configuration mode 1 (bios) pchb0 at pci0 dev 0 function 0 "Intel Pineview DMI Bridge" rev 0x02 vga1 at pci0 dev 2 function 0 "Intel Pineview Integrated Graphics Controller" rev 0x02 wsdisplay0 at vga1 mux 1: console (80x25, vt100 emulation) wsdisplay0: screen 1-5 added (80x25, vt100 emulation) intagp at vga1 not configured ppb0 at pci0 dev 28 function 0 "Intel 82801GB PCIE" rev 0x01: apic 8 int 17 (irq 255) pci1 at ppb0 bus 1 re0 at pci1 dev 0 function 0 "Realtek 8168" rev 0x03: RTL8168D/8111D (0x2800), apic 8 int 16 (irq 11), address 00:27:0e:09:78:51 rgephy0 at re0 phy 7: RTL8169S/8110S PHY, rev. 2 ppb1 at pci0 dev 28 function 1 "Intel 82801GB PCIE" rev 0x01: apic 8 int 16 (irq 255) pci2 at ppb1 bus 2 ppb2 at pci0 dev 28 function 2 "Intel 82801GB PCIE" rev 0x01: apic 8 int 18 (irq 255) pci3 at ppb2 bus 3 ppb3 at pci0 dev 28 function 3 "Intel 82801GB PCIE" rev 0x01: apic 8 int 19 (irq 255) pci4 at ppb3 bus 4 uhci0 at pci0 dev 29 function 0 "Intel 82801GB USB" rev 0x01: apic 8 int 23 (irq 9) uhci1 at pci0 dev 29 function 1 "Intel 82801GB USB" rev 0x01: apic 8 int 19 (irq 10) uhci2 at pci0 dev 29 function 2 "Intel 82801GB USB" rev 0x01: apic 8 int 18 (irq 11) uhci3 at pci0 dev 29 function 3 "Intel 82801GB USB" rev 0x01: apic 8 int 16 (irq 11) ehci0 at pci0 dev 29 function 7 "Intel 82801GB USB" rev 0x01: apic 8 int 23 (irq 9) usb0 at ehci0: USB revision 2.0 uhub0 at usb0 "Intel EHCI root hub" rev 2.00/1.00 addr 1 ppb4 at pci0 dev 30 function 0 "Intel 82801BAM Hub-to-PCI" rev 0xe1 pci5 at ppb4 bus 5 fxp0 at pci5 dev 0 function 0 "Intel 8255x" rev 0x08, i82559: apic 8 int 21 (irq 9), address 00:90:27:87:40:3b inphy0 at fxp0 phy 1: i82555 10/100 PHY, rev. 4 pcib0 at pci0 dev 31 function 0 "Intel Tigerpoint LPC Controller" rev 0x01 pciide0 at pci0 dev 31 function 2 "Intel 82801GB SATA" rev 0x01: DMA, channel 0 configured to native-PCI, channel 1 configured to native-PCI pciide0: using apic 8 int 19 (irq 10) for native-PCI interrupt wd0 at pciide0 channel 1 drive 0: <SAMSUNG HD502HJ> wd0: 16-sector PIO, LBA48, 476940MB, 976773168 sectors wd0(pciide0:1:0): using PIO mode 4, Ultra-DMA mode 6 ichiic0 at pci0 dev 31 function 3 "Intel 82801GB SMBus" rev 0x01: apic 8 int 19 (irq 10) iic0 at ichiic0 spdmem0 at iic0 addr 0x51: 1GB DDR2 SDRAM non-parity PC2-6400CL5 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 pcib0 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 midi0 at pcppi0: <PC speaker> spkr0 at pcppi0 wbsio0 at isa0 port 0x4e/2: W83627THF rev 0x84 lm1 at wbsio0 port 0x290/8: W83627THF npx0 at isa0 port 0xf0/16: reported by CPUID; using exception 16 mtrr: Pentium Pro MTRR support vscsi0 at root scsibus0 at vscsi0: 256 targets softraid0 at root root on wd0a swap on wd0b dump on wd0b Thanks,
