<br><br><div class="gmail_quote">On Mon, Mar 3, 2008 at 4:01 PM, Robert F. Scheer <<a href="mailto:rfscheer@speakeasy.net">rfscheer@speakeasy.net</a>> wrote:<br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<div class="Ih2E3d"><br>
On Mon, 2008-03-03 at 13:51 +1300, Michael van der Gulik wrote:<br>
><br>
><br>
> On Mon, Mar 3, 2008 at 2:01 PM, Robert F. Scheer<br>
> <<a href="mailto:rfscheer@speakeasy.net">rfscheer@speakeasy.net</a>> wrote:<br>
> Also, after installing the linux-rt ("realtime") kernel from<br>
> Ubuntu<br>
> repositories, the delay bag performance was horrible, as<br>
> mentioned<br>
> earlier, but not in the same league of hurt as the results<br>
> you've just<br>
> posted.<br>
><br>
><br>
> I can't tell if there's just the one real-time Linux which has<br>
> multiple names or if they're separate projects; I'm seeing linux-rt,<br>
> Linux/RT, rtlinux, RT-Linux, ...<br>
><br>
<br>
</div>The version in the Ubuntu repository is really a low-latency kernel<br>
based on work by Thomas Gleixner and Ingo Molnar. It is basically the<br>
standard Ubuntu kernel with their patch tailored for some Ubuntu<br>
differences.<br>
<br>
It is intended to support automation, robotics, telco and multimedia<br>
authoring for example.<br>
<br>
Supposedly, it adds support for high resolution timers and full<br>
preemption. (I haven't had time to get into what that really means or<br>
requires, sorry).<br>
<br>
It is not a real "real-time" Linux kernel by any means. It was an easy<br>
experiment that I did but not a very serious one.<br>
</blockquote></div><br><br>Do the numbers improve if you boost the Squeak process's priority significantly (i.e. "sudo nice -n-10 squeak")?<br><br>Gulik.<br><br>-- <br><a href="http://people.squeakfoundation.org/person/mikevdg">http://people.squeakfoundation.org/person/mikevdg</a><br>
<a href="http://gulik.pbwiki.com/">http://gulik.pbwiki.com/</a>