RealTime
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Launchpad entry: https://blueprints.launchpad.net/ubuntu/+spec/realtime
Created: Date(2007-01-09T17:28:06Z) by AlessioIgorBogani
Contributors: AlessioIgorBogani
Packages affected: linux-source-2.6.20
Summary
This specification details the plan to add hard real time support in Ubuntu.
Rationale
In some contexts (i.e. industrial automation, robotics and telco) the low-latency support is insufficient. In order to push Ubuntu in these contexts is necessary the support for high resolution timers and the full preemption in the Linux kernel. These features have been implemented by Thomas Gleixner and Ingo Molnar (http://people.redhat.com/mingo/realtime-preempt/).
We want also a valid FLOSS alternative to SLERT (http://www.novell.com/products/realtime/).
Use cases
Alex is developing an application software (SCADA type) for a customer and he would be very happy to use Linux and Ubuntu for the deployment.
Real time audio support in a radio station studio (http://postscriptumradio.org), which needs RT preemption to satisfy real time features of jack audio connection kit by Paul Davis.
Scope
This specification cover the linux kernel in Ubuntu.
Implementation
We hope to add a linux-image-realtime package in universe repositary (the same place of the linux-image-lowlatency package).
Beta available
Add, as root, to your /etc/apt/sources.list (remember to do a backup of this file) the following line:
deb http://www.texware.it/ubuntu feisty/
Thus execute:
wget -q http://www.texware.it/ubuntu/feisty/BBA3222D.gpg -O- | sudo apt-key add -BR sudo apt-get updateBR sudo apt-get install linux-realtime
Packages available:
linux-realtimeBR linux-image-realtimeBR linux-image-2.6.20-8-realtimeBR linux-image-2.6.20-9-realtimeBR cyclictest
Patch is available at:
http://www.texware.it/ubuntu/feisty/Ubuntu-2.6.20-8.14-realtime.diff BR http://www.texware.it/ubuntu/feisty/Ubuntu-2.6.20-9.16-realtime.diff
Todo
Debug versionBR Amd64 kernel versionBR Headers packagesBR