[squeak-dev] Re: Delay time question

Michael van der Gulik mikevdg at gmail.com
Mon Mar 3 02:36:15 UTC 2008


On Mon, Mar 3, 2008 at 4:01 PM, Robert F. Scheer <rfscheer at speakeasy.net>
wrote:

>
> On Mon, 2008-03-03 at 13:51 +1300, Michael van der Gulik wrote:
> >
> >
> > On Mon, Mar 3, 2008 at 2:01 PM, Robert F. Scheer
> > <rfscheer at speakeasy.net> wrote:
> >         Also, after installing the linux-rt ("realtime") kernel from
> >         Ubuntu
> >         repositories, the delay bag performance was horrible, as
> >         mentioned
> >         earlier, but not in the same league of hurt as the results
> >         you've just
> >         posted.
> >
> >
> > I can't tell if there's just the one real-time Linux which has
> > multiple names or if they're separate projects; I'm seeing linux-rt,
> > Linux/RT, rtlinux, RT-Linux, ...
> >
>
> The version in the Ubuntu repository is really a low-latency kernel
> based on work by Thomas Gleixner and Ingo Molnar.  It is basically the
> standard Ubuntu kernel with their patch tailored for some Ubuntu
> differences.
>
> It is intended to support automation, robotics, telco and multimedia
> authoring for example.
>
> Supposedly, it adds support for high resolution timers and full
> preemption.  (I haven't had time to get into what that really means or
> requires, sorry).
>
> It is not a real "real-time" Linux kernel by any means.  It was an easy
> experiment that I did but not a very serious one.
>


Do the numbers improve if you boost the Squeak process's priority
significantly (i.e. "sudo nice -n-10 squeak")?

Gulik.

-- 
http://people.squeakfoundation.org/person/mikevdg
http://gulik.pbwiki.com/
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