[Beowulf] Bernhard Kuhn's real time interrupt patch

[Andrew Piskorski]

Last year sometime I was reading about Bernhard Kuhn's real time
interrupt patch (aka rtirq-patch) for Linux:

  http://home.t-online.de/home/Bernhard_Kuhn/rtirq/20040304/rtirq.html
  http://linuxdevices.com/articles/AT6105045931.html

He seems to work on embedded systems, but for those there are other
real-time options.  But since it does not involve a separate real-time
kernel, low-latency cluster interconnects seem like the obvious niche
where his patch might be a big win.

So I was wondering, has anyone tried that?  I believe the low-latency
OS-bypass NICs are already doing some fancy mix of polling and waiting
for slow Linux interrupts, but shouldn't Kuhn's rtirq-patch still
help?

-- 
Andrew Piskorski <atp at piskorski.com>
http://www.piskorski.com/