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| ##(see the SpecSpec for an explanation) | == Realtime == |
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| ''Please check the status of this specification in Launchpad before editing it. If it is Approved, contact the Assignee or another knowledgeable person before making changes.'' | '''Basic introduction is available at:'''<<BR>> [[https://help.ubuntu.com/community/UbuntuStudio/RealTimeKernel]] <<BR>><<BR>> For a more in-depth look at kernels, please see: [[https://wiki.ubuntu.com/Kernel/Dev]] <<BR>><<BR>> '''News:''' <<BR>> The -preempt and -rt kernels are no longer being developed due to lack of support. Focus has instead turned to the -lowlatency and -realtime kernels, particularly for the the release of Ubuntu 11.04 Natty Narwhal. The long-term goal is to have -lowlatency in the official Ubuntu repositories, while maintaining -realtime in a dedicated PPA.<<BR>><<BR>> As of this writing, there are no alternative kernels (including -realtime and -lowlatency) available for Maverick Meerkat in either the official repositories or any Ubuntu Studio recommended repositories (such as that maintained by [[LaunchpadHome:abogani|Alessio Igor Bogani]]). It is recommended that you use the default -generic kernel with Maverick. <<BR>><<BR>>If you wish to see work continued on -preempt or -rt, you are encouraged to volunteer. To do so, join the Ubuntu Studio Developers e-mail list (see [[http://ubuntustudio.org/|Ubuntu Studio]]). |
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| * '''Launchpad entry''': https://blueprints.launchpad.net/ubuntu/+spec/realtime * '''Created''': [[Date(2007-01-09T17:28:06Z)]] by AlessioIgorBogani * '''Contributors''': AlessioIgorBogani * '''Source Package''': linux-patch-realtime-preempt-2.6.20 * '''Binaries Packages''': linux-image-2.6.20-X-realtime, linux-image-debug-2.6.20-X-realtime, linux-headers-2.6.20-X-realtime, linux-image-2.6.20-X-realtime-trace |
'''Make-up of the team and roles officially assigned:''' ||<-7 #cccccc :> '''Kernel Responsibility Matrix''' || ||<#eeeeee> '''Kernels''' ||<#eeeeee> '''Code & Packaging''' ||<#eeeeee> '''Upstream Relations''' ||<#eeeeee> '''Bug Triage''' ||<#eeeeee> '''Kernel/DKMS External Driver Upload''' ||<#eeeeee> '''Testing''' ||<#eeeeee> '''Video Driver Testing''' || ||<#eeeeee> '''Lucid -realtime i386''' ||<#FFFFCC> none ||<#FFFFCC> none ||<#FFFFCC> none ||<#FFFFCC> none ||<#CCFFCC> Asmo Koskinen/Erik Rasmussen/Brian David ||<#CCFFCC> Brian David(fglrx)/Asmo Koskinen (nvidia) (nvidia) || ||<#eeeeee> '''Lucid -realtime amd64''' ||<#FFFFCC> none ||<#CCFFCC> Tim Cook ||<#FFFFCC> none ||<#FFFFCC> none ||<#CCFFCC> Laurent Bellegarde/Asmo Koskinen ||<#CCFFCC> holstein(nvidia) / Laurent Bellegarde(fglrx)/Asmo Koskinen (nvidia) || ||<#eeeeee> '''Natty -lowlatency i386''' ||<#CCFFCC> Luke Yelavich / Scott Lavender / Ronan Jouchet ||<#CCFFCC> Scott Lavender ||<#CCFFCC> Scott Lavender / Ronan Jouchet ||<#CCFFCC> Luke Yelavich ||<#CCFFCC> Scott Lavender / Ronan Jouchet/Asmo Koskinen/Brian David ||<#CCFFCC> Ronan Jouchet (fglrx), Luke Yelavich (NVIDIA)/Asmo Koskinen (nvidia)/Brian David (fglrx)/ ailo(nvidia) || ||<#eeeeee> '''Natty -lowlatency amd64''' ||<#CCFFCC> Luke Yelavich / Janne Jokitalo ||<#CCFFCC> Janne Jokitalo ||<#CCFFCC> Janne Jokitalo ||<#CCFFCC> Luke Yelavich ||<#CCFFCC> Janne Jokitalo/Asmo Koskinen ||<#CCFFCC> Luke Yelavich (NVIDIA)/ Janne Jokitalo (NVIDIA)/Asmo Koskinen (nvidia)/ ailo(nvidia) || ||<#eeeeee> '''Natty -realtime i386''' ||<#CCFFCC> Alessio Igor Bogani ||<#CCFFCC> Alessio Igor Bogani ||<#CCFFCC> Alessio Igor Bogani ||<#FFFFCC> none ||<#CCFFCC> Asmo Koskinen/Erik Rasmussen/Brian David ||<#CCFFCC> Asmo Koskinen (nvidia)/Brian David (fglrx)/ ailo(nvidia) || ||<#eeeeee> '''Natty -realtime amd64''' ||<#CCFFCC> Alessio Igor Bogani ||<#CCFFCC> Alessio Igor Bogani ||<#CCFFCC> Alessio Igor Bogani ||<#FFFFCC> none ||<#CCFFCC> Tim Cook/Asmo Koskinen ||<#CCFFCC> holstein(nvidia)/Asmo Koskinen (nvidia)/ ailo(nvidia)|| '''Work in progress:''' <<BR>> Nvidia on -realtime kernel at Alessio's PPA: testers? <<BR>> |
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| == Summary == | '''Known issues:''' <<BR>> Missing a decent FAQ section <<BR>> Firewire audio devices: again volunteers? -- <<BR>> --[[LaunchpadHome:beejunk]] (Brian David): I also use firewire devices and can help here. As usual, mostly with testing. <<BR>> --[[LaunchpadHome:rlameiro]] (Ricardo Lameiro): I can help on testing too. I have a Edirol FA-101. Also I can try to speak directly with FFADO devs if needed. <<BR>> --[[LaunchpadHome:asmok]] (Asmo Koskinen): I can help on testing. I have an Echo Audiofire4. <<BR>> --[[LaunchpadHome:tapitman11]] (Tim Pitman): I can help as well. I also have an Echo Audiofire 4, so far working great in Maverick. <<BR>> |
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| This specification details the plan to add hard real time support in Ubuntu. | '''Development:''' <<BR>> http://kernel.ubuntu.com/git?p=abogani/ubuntu-natty-meta-lowlatency.git;a=summary <<BR>> http://kernel.ubuntu.com/git?p=abogani/ubuntu-natty-lowlatency.git;a=summary <<BR>> |
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| == Rationale == | '''Test images:''' <<BR>> https://launchpad.net/~abogani/+archive/ppa?field.series_filter=natty <<BR>> |
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| In some contexts (i.e. industrial automation, robotics and telco) the low-latency support is insufficient. In order to push Ubuntu in these contexts it is necessary to add support for high resolution timers and full preemption in the Linux kernel. These features have been implemented by Thomas Gleixner and Ingo Molnar (http://people.redhat.com/mingo/realtime-preempt/). | '''FAQ:''' <<BR>> Q: What is the difference between an -rt kernel and a -realtime kernel? |
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| We also want a valid FLOSS alternative to SLERT (http://www.novell.com/products/realtime/). | A: From a technical point of view, -rt and -realtime are the same kernel. They are both based on the PREEMPT_RT patchset, although the version may be different. The main difference is that the -rt kernel should be based on the Ubuntu source tree (and therefore can use the same features, patches, enabled hardware, security fixes and so on) and should offer the same services that the Ubuntu default -generic kernel offers. For example, it should be compatible with closed video drivers (nvidia and fglrx), any external DKMS drivers, and have available backport packages. The goal of an -rt kernel is to obtain a real time variant of the Ubuntu kernel that is aligned with the -generic kernel. <<BR>><<BR>> On the other hand, the -realtime kernel is a PREEMPT_RT patched kernel based on the vanilla source tree (not the Ubuntu source). This kernel will be missing Ubuntu specific code, patches or security fixes and it isn't guaranteed to be compatible with any external software (low level utilities, DKMS drivers and so on). It does not use the same Linux kernel version as the -generic kernel, and so these two kernels are not aligned. It is a working, upstream real-time kernel that is being used on Ubuntu. No more no less. |
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| == Use cases == | {{{#!wiki comment |
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| 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. | -lowlatency == -generic + more aggressive low latency kernel configuration It can offers all things that Ubuntu offer with -generic so -backport modules, video closed drivers and so on. It is very solid and oriented to "soft" users. Trade-off between low latency and power consumption. |
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| 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. | In less words: if you need of closed video drivers, external DKMS kernel modules, linux-backports-* you should probably start to use -lowlatency (when it will be available through Ubuntu repos). Instead if you really need of an real-time system you should avoid all above or trying to make those working alone. |
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| == Scope == | |
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| This specification covers a new linux kernel flavour (-realtime) in Ubuntu. | To put it simply: -lowlatency all the way! It delivers impressive results for maintenance requirements way lower than -realtime (or -rt even more), meaning less work for maintainers and new kernel candy for users. |
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| ## == Design == | Life is a trade-off: someone want a very hard real-time system without adopt other hardware architectures than pc (MCU, FPGA/ASIC, and so on), others want use normal and cheap pc, others want use also accelerated drivers also, others want a real-system which take care of they laptop's batteries too. And at the end we have limited resources(*) for give an answer on these needs (we are all volunteers). |
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| == Implementation == We hope to add in the universe repositary (the same place as the linux-image-lowlatency package) a source package that contain only the realtime-preempt patch (~2MB). This package have a build dependency to linux-source-2.6.20 package. When it's compiled it exctract the kernel code from linux-source-2.6.20, apply the patch, set the realtime kernel configuration and build all binary packages: linux-image-2.6.20-X-realtime, linux-image-debug-2.6.20-X-realtime, linux-headers-2.6.20-X-realtime, linux-image-2.6.20-X-realtime-trace. ## === Code === ## === Data preservation and migration === == Unresolved issues == 1. Seems that ACPI (and a good implementation of it) is mandatory by hrtimers (fundamental part of the Realtime preemption patch). From 2.6.21 hrtimers is merged in mainline thus we hope this will be resolved in the near future.[[BR]] 2. The realtime kernel break ABI compatibility. 3. The realtime kernel could expose you to security issue. == 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/ deb-src http://www.texware.it/ubuntu feisty/ |
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| Then execute: | === Natty Benchmarks === Below are the results from various community members. The table reports the minimum latency achieved with no Xruns ||<-4 #cccccc :> '''Natty Benchmarks Matrix''' || |
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| {{{ wget -q http://www.texware.it/ubuntu/feisty/BBA3222D.gpg -O- | sudo apt-key add - sudo apt-get update sudo apt-get install linux-realtime }}} |
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| Binary packages available: | ||<#eeeeee> '''Tester''' ||<#eeeeee> '''Date''' ||<#eeeeee> '''Machine''' ||<#eeeeee> '''Workflow''' ||<#eeeeee> '''Natty-generic 2.6.38-1''' ||<#eeeeee> '''Natty-lowlatency 2.6.38-1''' ||<#eeeeee> '''Natty-generic 2.6.38-2''' ||<#eeeeee> '''Natty-lowlatency 2.6.38-2'''||<#eeeeee> '''Natty-generic 2.6.38-3''' ||<#eeeeee> '''Natty-lowlatency 2.6.38-3'''||<#eeeeee> '''Natty-generic 2.6.38-5'''||<#eeeeee> '''Natty-lowlatency 2.6.38-5'''|| ||<#eeeeee> '''Scott Lavender''' || 2011-01-27 || Dell P4, 2.8ghz machine with 3 gigs memory and an MAudio Delta 44 card || ? || ? ||<#CCFFCC> 3ms || - || - || - || - || - || - || ||<#eeeeee> '''Ronan Jouchet''' || 2011-01-30 || Dell Vostro V13 / Celeron 1.3GHz / 2GB, TI Firewire card, Edirol FA-66 || 2channel Rakarrack session, no MIDI ||<#CCFFCC> 4ms ||<#CCFFCC> 4ms || - || - || - || - || - || - || ||<#eeeeee> '''ailo.at''' || 2011-01-31 || Dual Core 2.13GHz / Intel HDA (builtin sound) || Simple Ardour Session ||<#CCFFCC> 2.9 ms ||<#CCFFCC> 2.9 ms || - || - || - || - || - || - || ||<#eeeeee> '''ailo.at''' || 2011-02-14 || Dual Core 2.13GHz / Intel HDA (builtin sound) || Simple Ardour Session ||<#FFFFCC> 11.6 ms ||<#CCFFCC> 2.9 ms || ? || ? ||<#FFFFCC> 11.6 ms ||<#EEFFCC> 5.6ms || - || - || ||<#eeeeee> '''ailo.at''' || 2011-02-15 || Dual Core 2.13GHz / Intel HDA (builtin sound) || Simple Ardour Session ||<#FFFFCC> 11.6ms ||<#CCFFCC> 2.9ms ||<#FFFFCC> 11.6ms ||<#EEFFCC> 2.9/5.8ms* ||<#FFFFCC> 11.6ms ||<#EEFFCC> 2.9/5.8ms* || - || - || ||<#eeeeee> '''?''' || ? || ? || ? || ? || ? || ? || ? || ? || ? || ? || ? || ||<#eeeeee> '''?''' || ? || ? || ? || ? || ? || ? || ? || ? || ? || ? || ? || |
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| linux-realtime[[BR]] linux-image-realtime[[BR]] linux-headers-2.6.20-15-realtime (2.6.20-rt8)[[BR]] linux-image-2.6.20-15-realtime (2.6.20-rt8)[[BR]] linux-image-2.6.20-15-realtime-trace (2.6.20-rt8)[[BR]] linux-image-debug-2.6.20-15-realtime (2.6.20-rt8)[[BR]] cyclictest |
|
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| Source package: | *Occasional random xruns at 2.9ms, but stable for long periods of time. |
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| linux-patch-realtime-preempt-2.6.20 (2.6.20-rt8)[[BR]] | === Maverick Benchmarks === ||<-4 #cccccc :> '''Maverick Benchmarks Matrix''' || ||<#eeeeee> '''Tester''' ||<#eeeeee> '''Date''' ||<#eeeeee> '''Machine''' ||<#eeeeee> '''Workflow'''||<#eeeeee> '''Maverick-generic''' ||<#eeeeee> '''Maverick-lowlatency''' || ||<#eeeeee> '''Ronan Jouchet''' || 2011-01-30 || Dell Vostro V13 / Celeron 1.3GHz / 2GB, TI Firewire card, Edirol FA-66 || 2channel Rakarrack session, no MIDI ||<#FFFFCC> 16ms ||<#CCFFCC> 4ms || === Ancient stuff === These wiki pages covers hard real time support in Ubuntu. |
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| == FAQ == | [[RealTime/Feisty|RealTime Feisty]] <<BR>> [[RealTime/Gutsy|RealTime Gutsy]] <<BR>> [[RealTime/Hardy|RealTime Hardy]] <<BR>> [[RealTime/Intrepid|RealTime Intrepid]] <<BR>> [[RealTime/Jaunty|RealTime Jaunty]] <<BR>> [[RealTime/Karmic|RealTime Karmic]] <<BR>> [[RealTime/Lucid|RealTime Lucid]] |
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| '''Q) Did you manage to include all the regular Ubuntu kernel patches in it? If not, is it possible to know what was left out?''' [[BR]] A) No i don't include anything because i use _only_ full Ubuntu Kernel (not vanilla, not custom version or other). Ubuntu Realtime kernel is Ubuntu kernel plus realtime preemption patch. Also the configuration (aka /boot/config*) is the same expects for specific realtime options. '''Q) Where i cand find documentation?''' [[BR]] A) All existing docs are available on http://rt.wiki.kernel.org '''Q) Which are the differences between your patch and Ingo Molnar's one?''' [[BR]] A simple adaptation to the BenC's kernel source tree isn't the only difference: We work on Ubuntu specific code or drivers (aka ubuntu/* in the source) and also remove all code which isn't strictly related to realtime preemption support (in example kvm). == Todo == Restricted modules package [[BR]] Add schedutils package to Recommends or Suggests field [wiki:AlessioIgorBogani alessio] [[BR]] Investigate on PAM integration ([https://bugs.launchpad.net/ubuntu/+source/pam/+bug/21556 See Bugs 21556]) [wiki:AlessioIgorBogani alessio] [[BR]] == BoF agenda and discussion == * Any suggestion/feedbacks/requests? [wiki:AlessioIgorBogani alessio] [[BR]][[BR]] * I can host the packages on my repo if bandwith is necessary [wiki:Ttoine ttoine] [[BR]][[BR]] * I confirm that it seems to rock for music production, jack like it; will do my best to have it in the next Ubuntu Studio, hope that we will have the restricted modules packages for full opengl support, etc... [wiki:Ttoine ttoine] [[BR]][[BR]] * http://help.ubuntu.com/community/UbuntuStudioPreparation -> Here you will find the PAM settings we use at the moment with Ubuntu Studio. Alessio, feel free to contact me by mail if you feel that we tweak better. [wiki:Ttoine ttoine] Alessio has now joined the UbuntuStudio team. Hopefully we can get this work into Ubuntu for the next release. :) -CKontros ---- CategorySpec |
The RT kernel is still around! If you can help by describing it's current state, please do so. In the mean time see the official [[http://rt.wiki.kernel.org|rt.wiki.kernel.org]] and the [[http://ubuntustudio.org/|Ubuntu Studio]] team for more information. |
Realtime
Basic introduction is available at:
https://help.ubuntu.com/community/UbuntuStudio/RealTimeKernel
For a more in-depth look at kernels, please see: https://wiki.ubuntu.com/Kernel/Dev
News:
The -preempt and -rt kernels are no longer being developed due to lack of support. Focus has instead turned to the -lowlatency and -realtime kernels, particularly for the the release of Ubuntu 11.04 Natty Narwhal. The long-term goal is to have -lowlatency in the official Ubuntu repositories, while maintaining -realtime in a dedicated PPA.
As of this writing, there are no alternative kernels (including -realtime and -lowlatency) available for Maverick Meerkat in either the official repositories or any Ubuntu Studio recommended repositories (such as that maintained by Alessio Igor Bogani). It is recommended that you use the default -generic kernel with Maverick.
If you wish to see work continued on -preempt or -rt, you are encouraged to volunteer. To do so, join the Ubuntu Studio Developers e-mail list (see Ubuntu Studio).
Make-up of the team and roles officially assigned:
Kernel Responsibility Matrix |
||||||
Kernels |
Code & Packaging |
Upstream Relations |
Bug Triage |
Kernel/DKMS External Driver Upload |
Testing |
Video Driver Testing |
Lucid -realtime i386 |
none |
none |
none |
none |
Asmo Koskinen/Erik Rasmussen/Brian David |
Brian David(fglrx)/Asmo Koskinen (nvidia) (nvidia) |
Lucid -realtime amd64 |
none |
Tim Cook |
none |
none |
Laurent Bellegarde/Asmo Koskinen |
holstein(nvidia) / Laurent Bellegarde(fglrx)/Asmo Koskinen (nvidia) |
Natty -lowlatency i386 |
Luke Yelavich / Scott Lavender / Ronan Jouchet |
Scott Lavender |
Scott Lavender / Ronan Jouchet |
Luke Yelavich |
Scott Lavender / Ronan Jouchet/Asmo Koskinen/Brian David |
Ronan Jouchet (fglrx), Luke Yelavich (NVIDIA)/Asmo Koskinen (nvidia)/Brian David (fglrx)/ ailo(nvidia) |
Natty -lowlatency amd64 |
Luke Yelavich / Janne Jokitalo |
Janne Jokitalo |
Janne Jokitalo |
Luke Yelavich |
Janne Jokitalo/Asmo Koskinen |
Luke Yelavich (NVIDIA)/ Janne Jokitalo (NVIDIA)/Asmo Koskinen (nvidia)/ ailo(nvidia) |
Natty -realtime i386 |
Alessio Igor Bogani |
Alessio Igor Bogani |
Alessio Igor Bogani |
none |
Asmo Koskinen/Erik Rasmussen/Brian David |
Asmo Koskinen (nvidia)/Brian David (fglrx)/ ailo(nvidia) |
Natty -realtime amd64 |
Alessio Igor Bogani |
Alessio Igor Bogani |
Alessio Igor Bogani |
none |
Tim Cook/Asmo Koskinen |
holstein(nvidia)/Asmo Koskinen (nvidia)/ ailo(nvidia) |
Work in progress:
Nvidia on -realtime kernel at Alessio's PPA: testers?
Known issues:
Missing a decent FAQ section
Firewire audio devices: again volunteers? --
--beejunk (Brian David): I also use firewire devices and can help here. As usual, mostly with testing.
--rlameiro (Ricardo Lameiro): I can help on testing too. I have a Edirol FA-101. Also I can try to speak directly with FFADO devs if needed.
--asmok (Asmo Koskinen): I can help on testing. I have an Echo Audiofire4.
--tapitman11 (Tim Pitman): I can help as well. I also have an Echo Audiofire 4, so far working great in Maverick.
Development:
http://kernel.ubuntu.com/git?p=abogani/ubuntu-natty-meta-lowlatency.git;a=summary
http://kernel.ubuntu.com/git?p=abogani/ubuntu-natty-lowlatency.git;a=summary
Test images:
https://launchpad.net/~abogani/+archive/ppa?field.series_filter=natty
FAQ:
Q: What is the difference between an -rt kernel and a -realtime kernel?
A: From a technical point of view, -rt and -realtime are the same kernel. They are both based on the PREEMPT_RT patchset, although the version may be different. The main difference is that the -rt kernel should be based on the Ubuntu source tree (and therefore can use the same features, patches, enabled hardware, security fixes and so on) and should offer the same services that the Ubuntu default -generic kernel offers. For example, it should be compatible with closed video drivers (nvidia and fglrx), any external DKMS drivers, and have available backport packages. The goal of an -rt kernel is to obtain a real time variant of the Ubuntu kernel that is aligned with the -generic kernel.
On the other hand, the -realtime kernel is a PREEMPT_RT patched kernel based on the vanilla source tree (not the Ubuntu source). This kernel will be missing Ubuntu specific code, patches or security fixes and it isn't guaranteed to be compatible with any external software (low level utilities, DKMS drivers and so on). It does not use the same Linux kernel version as the -generic kernel, and so these two kernels are not aligned. It is a working, upstream real-time kernel that is being used on Ubuntu. No more no less.
Natty Benchmarks
Below are the results from various community members. The table reports the minimum latency achieved with no Xruns
Natty Benchmarks Matrix |
Tester |
Date |
Machine |
Workflow |
Natty-generic 2.6.38-1 |
Natty-lowlatency 2.6.38-1 |
Natty-generic 2.6.38-2 |
Natty-lowlatency 2.6.38-2 |
Natty-generic 2.6.38-3 |
Natty-lowlatency 2.6.38-3 |
Natty-generic 2.6.38-5 |
Natty-lowlatency 2.6.38-5 |
Scott Lavender |
2011-01-27 |
Dell P4, 2.8ghz machine with 3 gigs memory and an MAudio Delta 44 card |
? |
? |
3ms |
- |
- |
- |
- |
- |
- |
Ronan Jouchet |
2011-01-30 |
Dell Vostro V13 / Celeron 1.3GHz / 2GB, TI Firewire card, Edirol FA-66 |
2channel Rakarrack session, no MIDI |
4ms |
4ms |
- |
- |
- |
- |
- |
- |
ailo.at |
2011-01-31 |
Dual Core 2.13GHz / Intel HDA (builtin sound) |
Simple Ardour Session |
2.9 ms |
2.9 ms |
- |
- |
- |
- |
- |
- |
ailo.at |
2011-02-14 |
Dual Core 2.13GHz / Intel HDA (builtin sound) |
Simple Ardour Session |
11.6 ms |
2.9 ms |
? |
? |
11.6 ms |
5.6ms |
- |
- |
ailo.at |
2011-02-15 |
Dual Core 2.13GHz / Intel HDA (builtin sound) |
Simple Ardour Session |
11.6ms |
2.9ms |
11.6ms |
2.9/5.8ms* |
11.6ms |
2.9/5.8ms* |
- |
- |
? |
? |
? |
? |
? |
? |
? |
? |
? |
? |
? |
? |
? |
? |
? |
? |
? |
? |
? |
? |
? |
? |
? |
? |
*Occasional random xruns at 2.9ms, but stable for long periods of time.
Maverick Benchmarks
Maverick Benchmarks Matrix |
|||||
Tester |
Date |
Machine |
Workflow |
Maverick-generic |
Maverick-lowlatency |
Ronan Jouchet |
2011-01-30 |
Dell Vostro V13 / Celeron 1.3GHz / 2GB, TI Firewire card, Edirol FA-66 |
2channel Rakarrack session, no MIDI |
16ms |
4ms |
Ancient stuff
These wiki pages covers hard real time support in Ubuntu.
RealTime Feisty
RealTime Gutsy
RealTime Hardy
RealTime Intrepid
RealTime Jaunty
RealTime Karmic
RealTime Lucid
The RT kernel is still around! If you can help by describing it's current state, please do so. In the mean time see the official rt.wiki.kernel.org and the Ubuntu Studio team for more information.
RealTime (last edited 2011-02-23 10:51:46 by cache1)