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inchlin
n00b
Joined: 02 Oct 2002
Posts: 12
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 Posted: Sat Oct 05, 2002 3:12 pm Post subject: Open Hyper-Threading? |
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http://www.dell.com/us/en/esg/topics/power_ps3q02-morse.htm
So does gentoo support Hyper Threading?
I see the asus web page
845e,850e update the bios can support hyper threading
Does it means,
One p4 2.5a cpu can open hyper threading in bios
And enable in linux kernel? |
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inchlin
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Joined: 02 Oct 2002
Posts: 12
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anatolli
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Joined: 07 Sep 2002
Posts: 19
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| Posted: Sun Oct 06, 2002 5:29 pm Post subject: |
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the current generation of p4's don't support hyperthreading. The P4 Xeons do, and intel is talking about releasing hyperthreading into the desktop market with the 3.06Ghz procs. As of right now, if you don't have a Xeon, you don't have hyperthreading.
anatolli |
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keifir
Tux's lil' helper
Joined: 10 Jun 2002
Posts: 119
Location: Canada
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| Posted: Fri Dec 13, 2002 9:47 pm Post subject: |
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so kernel would need no adjustment(extra programming) then to support the new HT intel chips?
One would be able to use HT by specifying that there multiple cpus available, is this right?
thx, keifir |
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dgtlchlk
n00b
Joined: 27 Oct 2002
Posts: 1
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| Posted: Sat Dec 14, 2002 8:11 pm Post subject: |
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The new 3.06ghz P4's do indeed support hyper-threading, but its more of a bios thing than software.
| Quote: | | so kernel would need no adjustment(extra programming) then to support the new HT intel chips? |
Correct, the kernel wouldn't need know anything about it, because it happens all internally to the cpu and bios
| Quote: | | One would be able to use HT by specifying that there multiple cpus available, is this right? |
No, you wouldnt even need to specify that there were/was more than one cpu. Its all transparent to the system software.
At least i have yet to read a review online where any software had to be updated, but i could be wrong  |
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Tuna
Guru
Joined: 19 Jul 2002
Posts: 485
Location: Berlin
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| Posted: Sun Dec 15, 2002 5:30 pm Post subject: |
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| hm.. no need for SMP kernel? |
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Forge
Tux's lil' helper
Joined: 20 Jun 2002
Posts: 125
Location: KOP, PA, USA
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| Posted: Thu Dec 26, 2002 4:17 am Post subject: |
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SMP kernel, yes, as the system acts like there are two CPUs past the BIOS level.
You also get SMP race problems and the like, and performance doesn't always increase... Sometimes it decreases, and a single HT CPU does NOT scale like two real CPUs do. |
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pilla
Bodhisattva
Joined: 07 Aug 2002
Posts: 7729
Location: Underworld
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| Posted: Thu Dec 26, 2002 10:02 pm Post subject: |
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Note that SMP kernels add some overhead to control the race conditions.
I don't think I'd pay more for a Hyperthreading processor while Linux does not have specific support for it (I think that it needs changes only in the scheduller, but who I am to say that  ).
| Forge wrote: | SMP kernel, yes, as the system acts like there are two CPUs past the BIOS level.
You also get SMP race problems and the like, and performance doesn't always increase... Sometimes it decreases, and a single HT CPU does NOT scale like two real CPUs do. |
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"I'm just very selective about the reality I choose to accept." -- Calvin |
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