Re: [gentoo-user] Hyper Threading

[Imre Solti]

No it is for making user space programs threaded if they support it (I 
think).
I do not use it and I am HT.
You can check that HT is working because you start multiple kernel 
compiles in the background and then you can see both CPUs utilized 
around 99 % in "top". (Hit 1 when in top if only one CPU shows up.)
Imre

Manuel Pérez López wrote:
Another cuestion: Does emerge need the USE flag 'thread' for compiling HT 
right?

Recompiled kernel 2.6.1-gentoo-r1 with "Symmetric multi-processing support.".
Called kernel at boot with 'smp-acpi'
Changed /etc/make.conf for MAKEOPTS='-j3'


Thanks. All is right. The 2 cpus have been activated:

bash-2.05b$ cat /proc/cpuinfo
processor       : 0
vendor_id       : GenuineIntel
cpu family      : 15
model           : 2
model name      : Intel(R) Pentium(R) 4 CPU 2.60GHz
stepping        : 9
cpu MHz         : 2600.882
cache size      : 512 KB
physical id     : 0
siblings        : 2
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 pbe cid
bogomips        : 5144.57

processor       : 1
vendor_id       : GenuineIntel
cpu family      : 15
model           : 2
model name      : Intel(R) Pentium(R) 4 CPU 2.60GHz
stepping        : 9
cpu MHz         : 2600.882
cache size      : 512 KB
physical id     : 0
siblings        : 2
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 pbe cid
bogomips        : 5193.72





On Saturday 07 February 2004 01:25, Imre Solti wrote:

You do not need to recompile all the system only make the kernel for SMP
if you ran a non SMP system before.
All other is automagically done. (Edit  make.conf for the extra CPU to
use it during compilation.)
Also enable HT in BIOS.
Imre
Manuel Pérez López wrote:

Hello:

Well, I 've changed my system to a Pemtium IV with Hyper Threading. I
need to recompile all the system for this new posibility. How can I
emerge the packages with HT support? How can I compile the kernel with HT
support?
Thanks

Manuel Perez



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