Kernels for low latency/real time environments

Lars-Erik Helander lehswe at
Fri Mar 12 13:29:38 GMT 2010

Do your kernel packages provide corresponding modules for aufs so that
it could be used with Live CD/USB systems?


2010/3/12 Alessio Igor Bogani <abogani at>:
> Hi All,
> For those who are interested I have placed two new kernels
> (-lowlatency and -realtime) into my PPA:
> The -lowlatency kernel contains a more aggressive configuration to
> reduce latency than the -preempt one. But like -preempt it doesn't
> contain any code changes (so both start from the same -generic source
> tree).
> The -realtime kernel contains the upstream version of PREEMPT_RT
> patchset applied to a vanilla Linux kernel. The Ubuntu Archive already
> provides the linux-rt package but it uses the Karmic source tree as
> base for PREEMPT_RT patchset.
> The PPA also contains meta-packages so that after you have added PPA
> into your Ubuntu system a simple "sudo apt-get install linux-realtime"
> or "sudo apt-get install linux-lowlatency" will install what you need.
> There is also a recent copy of rt-tests for evaluation and comparison
> of all kernels and to better identify which meets your needs.
> I suggest following these simple rules:
> *) if you don't need a low latency system use -generic kernel
> *) If you need a low latency system please use -preempt kernel as a
> first choice (this reduces latency but doesn't sacrifice power saving
> features) from the Ubuntu archives directly from Ubuntu Kernel Team
> *) If you have an i386 system or -preempt isn't enough for your needs
> you should try the -lowlatency kernel present in my above-mentioned
> PPA.
> *) If -lowlatency also isn't enough you should try the -realtime
> kernel (like -lowlatency it is available through my PPA)
> Feel free to get in touch with me if you find these useful.
> Thanks!
> Ciao,
> Alessio
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