Date: Wed, 19 Mar 2003 12:02:43 +1100 From: Gregory Bond <gnb@itga.com.au> To: stable@freebsd.org Subject: Hyperthreading in 4.8RC Message-ID: <200303190102.MAA10267@lightning.itga.com.au>
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I have an HP Vl420 (P4-1.6, i845 Mb). AFAIK, this MB is not an explicitly MP motherboard - it has only 1 CPU slot. The latest 4.8 kernel seems to show me that this CPU has Hyperthreading: CPU: Intel(R) Pentium(R) 4 CPU 1.60GHz (1594.10-MHz 686-class CPU) Origin = "GenuineIntel" Id = 0xf12 Stepping = 2 Features=0x3febfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,C MOV,PAT,PSE36,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM> (Feature HTT == hyperthreading, according to identcpu.c). So I added the SMP options (IOAPIC, SMP, HTT) to the kernal config and rebooted. It seems to be running OK, and I see lots of IOAPIC and SMP-like things in the dmesg, e.g.: FreeBSD/SMP: Multiprocessor motherboard cpu0 (BSP): apic id: 0, version: 0x00050014, at 0xfee00000 io0 (APIC): apic id: 2, version: 0x00178020, at 0xfec00000 but I don't see the Hyperthreading: 2 logical CPUs message that I would expect, nor any reference to cpu1. What does this imply? Do I need an "official" SMP motherboard to take advantage of Hyperthreading? Or do I need a XEON processor, not just a plain P4 (and if so, is the HTT Feature is lying to me?) Or is there some other magic I can perform to get it working on the current hardware? Can someone point me to an interesting document on all this? Thanks! Greg. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message
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