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Date: Wed, 12 Jan 2005 15:17:35 -0500
From: Bryan Fullerton <fehwalker@gmail.com>
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References: <9094-SnapperMsgD246FC56BE0A255B@68.243.126.247>
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	 <35de0c30050111210235ea3060@mail.gmail.com>
Subject: Re: Hyperthreading hurts 5.3?
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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