Configuring Hyperthreading [SOLVED]

Sargonmetal · Last edited by Sargonmetal on Tue Mar 15, 2005 9:26 am; edited 1 time in total

Hi,

I try to activate Hyperthreading but I can't. I use a 2.6.10-gentoo-r7 kernel on a Pentium 4, 3'4GHz with HT.
When I set the Symmetric multi-processing support, I set a Maximum of 2 CPUS with the SMT option, when I restart my ethernet is not loaded, my usb doesn't work and the windows partition is not recognizeble. And I don't know if the HT is activated....

Here it is a part of my .config:

ebrostig · Posted: Wed Mar 09, 2005 10:59 pm Post subject:

Do 'cat /proc/cpuinfo'

If HT is working (did you enable it in the BIOS setup btw?), you will see 2 CPU's listed...

Erik
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thubble · Posted: Thu Mar 10, 2005 12:57 am Post subject:

Do you compile your VFAT/ethernet/USB drivers as modules? If so, you have to rebuild and reinstall your modules after activating SMP support in the kernel:

Sargonmetal · Posted: Fri Mar 11, 2005 10:27 am Post subject:

when I do "cat /proc/cpuinfo" I only see one CPU:

freebies_11 · n00b Joined: 09 Dec 2004 Posts: 36

Did you enable support for your chipset in menuconfig? That's the most common problem associated with DMA not activated.

Sargonmetal · Posted: Fri Mar 11, 2005 1:38 pm Post subject:

mmhh I don't know.
How could I know it? And how can I activate it?
Thanks!

(As I said I am a newbie on linux...)

MaDDeePee · Guru Joined: 18 Aug 2004 Posts: 393 Location: Germany

Also dont passtrough "nodma or noapic" to the kernel!

Ensure SMP enabled in "Processor type and features" and Maximum of cpus > 1

As ebrostig told, youll see two cpus instead of one in /proc/cpuinfo in HT

Is HT activated in your MoBo bios?

thubble · Posted: Fri Mar 11, 2005 11:56 pm Post subject:

Does everything work with a uniprocessor build of the same kernel version? Also, you might want to check your BIOS settings to see if hyperthreading is disabled.

EDIT: Beaten on the BIOS suggestion, didn't see that

Sargonmetal · Posted: Sat Mar 12, 2005 1:05 am Post subject:

Yes, HT is enabled on boot.

How can I see if "noapic or nodma" is set? Anyway, what does "noapic" mean?
When I boot from a livecd I can turn on dma with hdparm but with my current kernel configuration I can't.

I think linux is too difficult for me.... I don't know how to set the dma or the ht and this process should be easy, isn't it?!

Oh, I hope somebody finds the solution to my problem.
A very big thanks to all!

Sargonmetal · Posted: Mon Mar 14, 2005 8:25 pm Post subject:

Ok, the problem has been found: when I recompiled my kernel I didn't have my /boot partition mounted :oops:

Anyway, thank you very much for your help, everything works now

chunderbunny · Posted: Mon Mar 14, 2005 10:21 pm Post subject:

You know, I'm beginning ot think that removing write support from /boot (when it isn't mounted) would be a good idea. This way if you forget to mount your /boot partition and try and install something you will get "permission denied" errors, which should hopefully prompt you to remember to mount the partition.

Sargonmetal · Posted: Tue Mar 15, 2005 9:27 am Post subject:

That's a good one. I will remove it now

Thanks!