Date: Sat, 8 Mar 2003 13:18:52 +0100 From: Richard Nyberg <rnyberg@it.su.se> To: freebsd-smp@freebsd.org Subject: hyperthreading randomness Message-ID: <20030308121852.GA25380@murmeldjur.it.su.se>
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I have a Dell Precision 450 with 2 xeon CPU:s. The weird thing is that it randomly boots up with either 2 or 4 CPUs on the same 4-STABLE kernel. 2 more often than 4. It seems a bit unpredictable :( CPU: Intel(R) Xeon(TM) CPU 2.66GHz (2657.82-MHz 686-class CPU) Origin = "GenuineIntel" Id = 0xf27 Stepping = 7 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> Hyperthreading: 2 logical CPUs Diff of dmesg with 2 and 4 CPUs. --- /tmp/dmesg.old Sat Mar 8 12:10:33 2003 +++ /var/run/dmesg.boot Sat Mar 8 11:57:38 2003 @@ -19,7 +19,9 @@ Programming 24 pins in IOAPIC #2 FreeBSD/SMP: Multiprocessor motherboard cpu0 (BSP): apic id: 0, version: 0x00050014, at 0xfee00000 - cpu1 (AP): apic id: 3, version: 0x00050014, at 0xfee00000 + cpu1 (AP): apic id: 1, version: 0x00050014, at 0xfee00000 + cpu2 (AP): apic id: 2, version: 0x00050014, at 0xfee00000 + cpu3 (AP): apic id: 3, version: 0x00050014, at 0xfee00000 io0 (APIC): apic id: 4, version: 0x00178020, at 0xfec00000 io1 (APIC): apic id: 5, version: 0x00178020, at 0xfec80000 io2 (APIC): apic id: 6, version: 0x00178020, at 0xfec80800 @@ -103,6 +105,8 @@ APIC_IO: Testing 8254 interrupt delivery APIC_IO: routing 8254 via IOAPIC #0 intpin 2 SMP: AP CPU #1 Launched! +SMP: AP CPU #3 Launched! +SMP: AP CPU #2 Launched! ad0: 38146MB <WDC WD400BB-75DEA0> [77504/16/63] at ata0-master UDMA100 acd0: DVD-ROM <LITEON DVD-ROM LTD163> at ata1-master UDMA33 acd1: CD-RW <HL-DT-ST GCE-8481B> at ata1-slave UDMA33 -Richard To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-smp" in the body of the message
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