Re: [LAU] How to turn off hyperthreading?

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To: Julien Claassen <julien@...>
Cc: linux-audio-user <linux-audio-user@...>
Date: Monday, March 25, 2013 - 8:23 pm

Hi David,
I have seen hyperthreading cause issues with audio applications (CPU
usage spikes). My understanding is that this is because the CPU tells
the operating system that it has twice the number of cores that it
actually has. A hyperthreading CPU can do a limited amount of work in
parallel, but for audio where you're doing the same thing over and
over on multiple threads it can cause issues when you need to turn
around a result in a reliable and short number of milliseconds.
However, I am not a hardware engineer so it's possible that my
explanation isn't as accurate as it could be, so take it with some
grain of salt :).

It can typically be disabled as an option in the BIOS.

-Louis

On Mon, Mar 25, 2013 at 12:26 PM, Julien Claassen wrote:

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Messages in current thread:
[LAU] How to turn off hyperthreading?, david, (Mon Mar 25, 7:06 pm)
Re: [LAU] How to turn off hyperthreading?, Jeremy Jongepier, (Mon Mar 25, 9:05 pm)
Re: [LAU] How to turn off hyperthreading?, John Murphy, (Mon Mar 25, 10:25 pm)
Re: [LAU] How to turn off hyperthreading?, Simon Wise, (Tue Mar 26, 5:32 am)
Re: [LAU] How to turn off hyperthreading?, david, (Tue Mar 26, 9:09 am)
Re: [LAU] How to turn off hyperthreading?, Jostein Chr. Andersen, (Mon Mar 25, 8:39 pm)
Re: [LAU] How to turn off hyperthreading?, david, (Thu Mar 28, 5:09 pm)
Re: [LAU] How to turn off hyperthreading?, Jostein Chr. Andersen, (Mon Mar 25, 10:19 pm)
Re: [LAU] How to turn off hyperthreading?, Julien Claassen, (Mon Mar 25, 7:25 pm)
Re: [LAU] How to turn off hyperthreading?, Louis Gorenfeld, (Mon Mar 25, 8:23 pm)
Re: [LAU] How to turn off hyperthreading?, david, (Tue Mar 26, 9:45 am)