Date: Wed, 12 Jan 2005 15:17:35 -0500 From: Bryan Fullerton <fehwalker@gmail.com> To: freebsd-questions@freebsd.org Subject: Re: Hyperthreading hurts 5.3? Message-ID: <35de0c3005011212174b8a2dc6@mail.gmail.com> In-Reply-To: <35de0c30050111210235ea3060@mail.gmail.com> References: <9094-SnapperMsgD246FC56BE0A255B@68.243.126.247> <20050112014359.GA3722@gothmog.gr> <B8CC38DE-6455-11D9-87A5-000D93AD26C8@tntluoma.com> <35de0c30050111210235ea3060@mail.gmail.com>
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On Wed, 12 Jan 2005 00:02:37 -0500, Bryan Fullerton <fehwalker@gmail.com> wrote: > I'm experiencing some strangeness with a uniproc HTT-capable machine > and SATA with either SMP or non-SMP kernels, so I'll try turning off > HTT in the BIOS later this week and see if that helps. Well, this is interesting. I disabled HTT in the BIOS and rebooted with a SMP kernel. As expected, there is only one CPU available after boot. However, FreeBSD still detects that the CPU is HTT-capable and prints the following in dmesg output: CPU: Intel(R) Pentium(R) 4 CPU 2.80GHz (2793.01-MHz 686-class CPU) Origin = "GenuineIntel" Id = 0xf33 Stepping = 3 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 If my sig11 issue doesn't recur now that HTT is off I'll go back to a non-SMP kernel and confirm there are no issues there too. Bryan
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