ubuntu-devel Digest, Vol 65, Issue 19

[Eric Hedekar]

>
> Date: Thu, 21 Jan 2010 12:32:34 -0500
> From: Scott Kitterman <ubuntu at kitterman.com>
> Subject: Re: Lucid server flavour RFC
> To: ubuntu-devel at lists.ubuntu.com
> Message-ID: <201001211232.34146.ubuntu at kitterman.com>
> Content-Type: Text/Plain;  charset="iso-8859-1"
>
> On Wednesday 20 January 2010 11:06:36 am Tim Gardner wrote:
> > I'm considering an additional Lucid x86_64 flavour, one tuned for low
> > latency, power consumptive platforms. I've received a fair bit of
> > anecdotal evidence that the current Lucid server flavour is not well
> > tuned for some workloads. Examples include audio processing platforms
> > such as asterisk and mythbuntu. There are a number of folks that have
> > requested a higher HZ setting for the desktop as well.
>
> I'm curious what use cases this would solve the the RT kernel does not or
> why
> the RT kernel couldn't be this additional flavor?
>
> Scott K
>
>
I just wanted to chime in and mention that the RT kernel is a very
hit-and-miss package.  Very often the Ubuntu package is frozen/released
before the upstream RT patches are released and therefore is quite buggy.
For the 2.6.32 kernel it has been announced that no RT patch will ever be
released, so the plan for the RT package (as I understand it) is to leave it
at 2.6.31 for Lucid.

In fact, the Ubuntu Studio team was recently discussing the option of
creating a new kernel package flavour with same source but different
configuration naming it linux-preempt for example (PREEMPT != PREEMPT_RT).
Threaded IRQs, PREEMPT enabled and HZ set to 1000HZ.  This was seen as a
solution to the inconsistency that we've experienced with the RT kernel from
release to release.  I would support this new kernel flavour and would look
forward to help in testing it.

-Eric Hedekar
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