Re: [LAU] How to turn off hyperthreading?

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To: Jeremy Jongepier <jeremy@...>
Cc: <linux-audio-user@...>
Date: Sunday, December 22, 2013 - 9:23 pm

On Sun, 22 Dec 2013, Jeremy Jongepier wrote:

I don't mind, it is not my info after all :)

>From the bit above, it would appear that "turning the cpu off" while the
system is running only stops the kernel from assigning new tasks to a cpu,
but does not move threads already assigned to a new cpu. Concidering that
you probably run that script pretty early at boot, probably everything
assigned to those cpus is system and will run till shutdown. (just a guess
on my part though) There are utilities that can push tasks from cpu to
cpu, but I am not familiar with them.

With hyperthreading on, i am still able to run my delta 66 at -p64 with no
xruns. With hyperthreading off I can run the same card at -p16 with
guitarix and no xruns. So hyperthreading only makes a difference (for me)
below -p64.

Of note, I moved the card to not only a clear irq PCI slot, but the pci
slot with the highest clear irq. I had a midi interface in the next higher
irq and had problems till I switched them around phyically.

This is an older computer... single core P4 at 2.4Ghz and 2.5G ram.

--
Len Ovens
www.ovenwerks.net

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Messages in current thread:
[LAU] A2J-MIDI Bridge error, Kevin Utter, (Fri Dec 20, 5:37 pm)
Re: [LAU] A2J-MIDI Bridge error, Jeremy Jongepier, (Fri Dec 20, 6:58 pm)
Re: [LAU] A2J-MIDI Bridge error, Kevin Utter, (Sat Dec 21, 2:59 pm)
Re: [LAU] A2J-MIDI Bridge error, Jeremy Jongepier, (Sat Dec 21, 7:06 pm)
Re: [LAU] A2J-MIDI Bridge error, Jeremy Jongepier, (Sat Dec 21, 7:11 pm)
Re: [LAU] A2J-MIDI Bridge error, Len Ovens, (Sat Dec 21, 5:04 pm)
[LAU] How to turn off hyperthreading?, david, (Sun Dec 22, 6:34 am)
Re: [LAU] How to turn off hyperthreading?, Gene Heskett, (Sun Dec 22, 9:52 am)
Re: [LAU] How to turn off hyperthreading?, Moshe Werner, (Sun Dec 22, 6:57 am)
Re: [LAU] How to turn off hyperthreading?, david, (Sun Dec 22, 7:24 am)
Re: [LAU] How to turn off hyperthreading?, Len Ovens, (Sun Dec 22, 4:37 pm)
Re: [LAU] How to turn off hyperthreading?, Jeremy Jongepier, (Sun Dec 22, 8:04 pm)
Re: [LAU] How to turn off hyperthreading?, Len Ovens, (Sun Dec 22, 11:25 pm)
Re: [LAU] How to turn off hyperthreading?, Len Ovens, (Sun Dec 22, 9:23 pm)
Re: [LAU] A2J-MIDI Bridge error, Paul Davis, (Fri Dec 20, 6:09 pm)
Re: [LAU] A2J-MIDI Bridge error, Ralf Mardorf, (Fri Dec 20, 6:01 pm)