Date: Thu, 13 Feb 2003 17:53:24 +0100 From: =?iso-8859-1?Q?Roub=EDcek_Zdenek_=28PragoNet=29?= <Zdenek.Roubicek@pragonet.cz> To: <stable@FreeBSD.ORG> Subject: RE: 4.7-stable & smp Message-ID: <9256D57F598E6C41B288AA7DB94F29C9604A2A@pgnmail1.pgnaplikace.cz>
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Any chance to disable it (hyperthreading)? I just want 2 physical CPUs not 4 virtual working. Thx, zdenek > -----Original Message----- > From: Erik Trulsson [mailto:ertr1013@student.uu.se] > Sent: Thursday, February 13, 2003 12:54 AM > To: Mike Hoskins > Cc: stable@FreeBSD.ORG > Subject: Re: 4.7-stable & smp > > > On Wed, Feb 12, 2003 at 03:43:53PM -0800, Mike Hoskins wrote: > > > > After building world from a cvsup on Feb 10 I see, > > > > % dmesg > > <snip> > > SMP: AP CPU #2 Launched! > > SMP: AP CPU #1 Launched! > > SMP: AP CPU #3 Launched! > > > > I don't recall seeing mention of "CPU #3" before. (It is a > 2 CPU box.) > > Is this actually something broken (seems to work just fine), or just > > semantics? :) It does say "2 logical CPUs": > > It is not a bug, it is a feature. :-) > The magical word here is "Hyperthreading". With Intel's latest P4 and > Xeon CPUs you can treat each physical CPU as two logical CPUs. > Basic support for this was recently added to -stable. You are seeing > the results of this. > > > > > CPU: Intel(R) XEON(TM) CPU 2.00GHz (1989.47-MHz 686-class CPU) > > Origin = "GenuineIntel" Id = 0xf24 Stepping = 4 > > > Features=0x3febfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SE > P,MTRR,PGE,MCA,C > > MOV,PAT,PSE36,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM> > > Hyperthreading: 2 logical CPUs > > real memory = 1073676288 (1048512K bytes) > > avail memory = 1041915904 (1017496K bytes) > > Changing APIC ID for IO APIC #0 from 0 to 4 on chip > > Changing APIC ID for IO APIC #1 from 0 to 5 on chip > > Changing APIC ID for IO APIC #2 from 0 to 6 on chip > > Programming 16 pins in IOAPIC #0 > > IOAPIC #0 intpin 2 -> irq 0 > > Programming 16 pins in IOAPIC #1 > > Programming 16 pins in IOAPIC #2 > > FreeBSD/SMP: Multiprocessor motherboard > > cpu0 (BSP): apic id: 0, 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: 0x000f0011, at 0xfec00000 > > io1 (APIC): apic id: 5, version: 0x000f0011, at 0xfec01000 > > io2 (APIC): apic id: 6, version: 0x000f0011, at 0xfec02000 > > -- > <Insert your favourite quote here.> > Erik Trulsson > ertr1013@student.uu.se > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-stable" in the body of the message > To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the messagehelp
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