Hyperthreading can be disabled - I never tryed it myself - but its in BIOS advanced options for most computers/motherboards I've seen.

Depending on the situation that can be either good of bad, If you only run one intensive cpu program (i.e.: one instance of PD) is good to give a full cpu to it, but if you run for instance Renoise (which for me is cpu intensive) and Pd, disabling hyperthreading will result in even more buffer glitch. I think some game folks used to disable hyperthreading in intel's p4 and get better rates than with it turned on, just to serve as a mere example - but then again Software Engineers would argue that this is just a matter of how threaded the programs are, and how they make good use of that.

Best regards,
Pedro

On Sun, Jun 6, 2010 at 6:08 PM, Ingo Scherzinger <ingo@miamiwave.com> wrote:
Looks like there are some problems with the soundcard drivers.
I'm running very heavy patches with 3 ms. Both on Windows XP and Ubuntu.
Audio and MIDI.
However, on Windows I am using a RME HDSP card which has very good ASIO
drivers. Don't forget to set system options to "background tasks" (very
important!).
I also noticed that in general Intel CPUs are pretty bad for Pd since they
use hyperthreading which makes Pd see two CPUs and uses only 50% of one
core. AMDs are twice as efficient because Pd uses the entire core.

Ingo


> cyrille henry wrote:
> > but since you don't like this, you should : in pd / startup
> > add in "startup flags" :
> > -noaudio -audiobuf 0 -mididev 3
> > than : "save all setting" and it should work for next reboot...
> >
>
> That's fine but what if you want to trigger sound with the MIDI input?
> I've been trying some settings and find that if I set the delay less
> than 100ms the MIDI delay goes up to about 500ms, if it works at all.
>
> I usually only use Pd on WinXp to generate background tracks since the
> latency is so awful compared to linux.
>
> Martin


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--
Pedro Lopes
contacto: jazz@radiozero.pt
website: http://web.ist.utl.pt/Pedro.Lopes