Re: AW: HT enable on BIOS which doesn't supports it?

Re: AW: HT enable on BIOS which doesn't supports it?

[Bradley Chapman]

> On Tue, 18 Nov 2003 17:07:29 +0100, "Michal Semler (volny.cz)" said:
> > Hmm..so why "ht" flag is detected?
> >
> > This chip is really strange. It looks like only renamed real P4/XEON,
> > coz through CPUFREQ I got it to work on lower frequencies:
> 
> Not really. Here's mine (Dell Latitude C840):
> 
> processor : 0
> vendor_id : GenuineIntel
> cpu family : 15
> model : 2
> model name : Intel(R) Pentium(R) 4 Mobile CPU 1.60GHz
> stepping : 4
> cpu MHz : 1595.776
> ....
> flags : fpu vme de pse tsc msr pae mce cx8 sep mtrr pge mca cmov pat pse36 clflush
> dts acpi mmx fxsr sse sse2 ss ht tm
> 
> Wow.. HT-enabled. However, if I build an SMP-enabled kernel, it turns out that
> there's only one sibling...

My CPU is like that too:

processor       : 0
vendor_id       : GenuineIntel
cpu family      : 15
model           : 2
model name      : Mobile Intel(R) Pentium(R) 4 - M CPU 2.00GHz
stepping        : 7
cpu MHz         : 1994.259
cache size      : 512 KB
fdiv_bug        : no
hlt_bug         : no
f00f_bug        : no
coma_bug        : no
fpu             : yes
fpu_exception   : yes
cpuid level     : 2
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 sep mtrr pge mca cmov pat pse36
clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe cid
bogomips        : 3932.16

I also have an 'ht' flag -- but I've never tried SMP. XP doesn't seem to think HT
is on here either, so I just put it down as an anomaly.

Brad

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Re: AW: HT enable on BIOS which doesn't supports it?

[Michael Buesch]

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Hash: SHA1

On Tuesday 18 November 2003 17:56, Bradley Chapman wrote:
> My CPU is like that too:
> 
> processor       : 0
> vendor_id       : GenuineIntel
> cpu family      : 15
> model           : 2
> model name      : Mobile Intel(R) Pentium(R) 4 - M CPU 2.00GHz
> stepping        : 7
> cpu MHz         : 1994.259
> cache size      : 512 KB
> fdiv_bug        : no
> hlt_bug         : no
> f00f_bug        : no
> coma_bug        : no
> fpu             : yes
> fpu_exception   : yes
> cpuid level     : 2
> wp              : yes
> flags           : fpu vme de pse tsc msr pae mce cx8 sep mtrr pge mca cmov
> pat pse36\r clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe cid
> bogomips        : 3932.16
> 
> I also have an 'ht' flag -- but I've never tried SMP. XP doesn't seem to
> think HT\r is on here either, so I just put it down as an anomaly.

All Northwood CPUs have ht, but it's disabled and you cannot use it.
(except you have an "official" HT-CPU 8-) )

mb@lfs:~> cat /proc/cpuinfo 
processor       : 0
vendor_id       : GenuineIntel
cpu family      : 15
model           : 2
model name      : Intel(R) Pentium(R) 4 CPU 1.60GHz
stepping        : 4
cpu MHz         : 2240.925
cache size      : 512 KB
fdiv_bug        : no
hlt_bug         : no
f00f_bug        : no
coma_bug        : no
fpu             : yes
fpu_exception   : yes
cpuid level     : 2
wp              : yes
flags           : 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 ht tm
bogomips        : 4423.68

> Brad

- -- 
Regards Michael Buesch  [ http://www.tuxsoft.de.vu ]
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Re: AW: HT enable on BIOS which doesn't supports it?

[bill davidsen]

In article <20031118165605.39280.qmail@web40903.mail.yahoo.com>,
Bradley Chapman  <kakadu_croc@yahoo.com> wrote:

| My CPU is like that too:
| 
| processor       : 0
| vendor_id       : GenuineIntel
| cpu family      : 15
| model           : 2
| model name      : Mobile Intel(R) Pentium(R) 4 - M CPU 2.00GHz
| stepping        : 7
| cpu MHz         : 1994.259
| cache size      : 512 KB
| fdiv_bug        : no
| hlt_bug         : no
| f00f_bug        : no
| coma_bug        : no
| fpu             : yes
| fpu_exception   : yes
| cpuid level     : 2
| wp              : yes
| flags           : fpu vme de pse tsc msr pae mce cx8 sep mtrr pge mca cmov pat pse36
| clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe cid
| bogomips        : 3932.16
| 
| I also have an 'ht' flag -- but I've never tried SMP. XP doesn't seem to think HT
| is on here either, so I just put it down as an anomaly.

You can have the HT feature with only one sibling. The value of this is
not obvious, and I have no idea if the 2nd sib is really disabled or if
it is missing. You can find good discussion in comp.sys.intel and some
of the conspiracy groups, I bet.

-- 
bill davidsen <davidsen@tmr.com>
  CTO, TMR Associates, Inc
Doing interesting things with little computers since 1979.

Re: AW: HT enable on BIOS which doesn't supports it?

[Michal Semler (volny.cz)]

Hmm..so why "ht" flag is detected?

This chip is really strange. It looks like only renamed real P4/XEON,
coz through CPUFREQ I got it to work on lower frequencies:

cpufreq: P4/Xeon(TM) CPU On-Demand Clock Modulation available

processor       : 0
vendor_id       : GenuineIntel
cpu family      : 15
model           : 2
model name      : Intel(R) Celeron(R) CPU 2.40GHz
stepping        : 9
cpu MHz         : 299.700
cache size      : 128 KB
fdiv_bug        : no
hlt_bug         : no
f00f_bug        : no
coma_bug        : no
fpu             : yes
fpu_exception   : yes
cpuid level     : 2
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 sep mtrr pge mca cmov pat 
pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm
bogomips        : 597.91

Can somebody tells me more? I would like start HT if it is possible

Michal

Dne úterý 18 listopad 2003 16:55 jste napsal(a):
> The Celeron is not a HT CPU!!!!
>
> -----Ursprüngliche Nachricht-----
> Von: linux-kernel-owner@vger.kernel.org
> [mailto:linux-kernel-owner@vger.kernel.org] Im Auftrag von Michal Semler
> (volny.cz)
> Gesendet: Dienstag, 18. November 2003 16:45
> An: linux-kernel@vger.kernel.org
> Betreff: HT enable on BIOS which doesn't supports it?
>
>
> Hi, in my laptop Acer TravelMate242 I have HT enabled CPU,
>
> but when I try start up with SMP or LocalAPIC kernel enabled, kernel
> freezes
>
> during boot time.
>
> Is there any possibility to run HT enabled CPU on my laptop without BIOS
> support?
>
> processor       : 0
> vendor_id       : GenuineIntel
> cpu family      : 15
> model           : 2
> model name      : Intel(R) Celeron(R) CPU 2.40GHz
> stepping        : 9
> cpu MHz         : 2398.001
> cache size      : 128 KB
> fdiv_bug        : no
> hlt_bug         : no
> f00f_bug        : no
> coma_bug        : no
> fpu             : yes
> fpu_exception   : yes
> cpuid level     : 2
> wp              : yes
> flags           : fpu vme de pse tsc msr pae mce cx8 sep mtrr pge mca cmov
> pat
> pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm
> bogomips        : 4784.12
>
> Thanks a lot
>
> Michal
>
> -
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Re: AW: HT enable on BIOS which doesn't supports it?

[Valdis.Kletnieks]

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On Tue, 18 Nov 2003 17:07:29 +0100, "Michal Semler (volny.cz)" said:
> Hmm..so why "ht" flag is detected?
> 
> This chip is really strange. It looks like only renamed real P4/XEON,
> coz through CPUFREQ I got it to work on lower frequencies:

Not really.  Here's mine (Dell Latitude C840):

processor       : 0
vendor_id       : GenuineIntel
cpu family      : 15
model           : 2
model name      : Intel(R) Pentium(R) 4 Mobile CPU 1.60GHz
stepping        : 4
cpu MHz         : 1595.776
....
flags           : fpu vme de pse tsc msr pae mce cx8 sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm

Wow.. HT-enabled. However, if I build an SMP-enabled kernel, it turns out that
there's only one sibling...


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