Last call (was "Natty and RT Kernel)

David Henningsson david.henningsson at
Tue Oct 5 12:52:17 BST 2010

On 2010-10-05 10:37, Alessio Igor Bogani wrote:
> David,
> 2010/10/5 David Henningsson<david.henningsson at>:
> [...]
>> great that you want to manage these kernels!
> I have always managed -rt kernels in Ubuntu since Feisty Until
> Maverick where I have gave up for personal reasons.

Okay, then a big thanks for your contributions so far!

>> I'm mostly curious about -lowlatency, but unfortunately I haven't got around
>> to test it. I think -preempt is a server kernel? Could you also say that
>> -lowlatency is the desktop version of -preempt?
> I don't know much about -preempt. A low latency kernel in server
> context make little sense to me at least.

To give you that context - from what I've heard, Red Hat has customers 
in the stock business where milliseconds could be the difference between 
being the one being able to buy the stock being up for sale, or losing 
the transaction. That's why the PREEMPT_RT patches were originally created.
I know nothing about whether Canonical has customers in that sector or not.

>> Is there a difference between -rt and -realtime, except that your -realtime
>> seems more updated than -rt? Do you think we should replace the official
>> linux-rt, with your linux-realtime?
> Few minutes ago I replied to Laurent about that.
>> closely until now, so I'd also like to ask you - do you feel you have the
>> support you need from the kernel-team's side for maintaining these kernels?
> Really I don't understand what you mean with "feel".
> In any case I avoid to reply on this answer because I don't want start a flame.


> [...]
>> I think we need to have it for every release, to get the best possible
>> testing and quality of these kernels. If that's possible?
> The time of one-man-kernel-made is finished. So if people want the
> real time kernel they should help.

Okay, I understand, and I'm glad that Luke replied that he wanted to 
help out, at least with the lowlatency version.

I think we need people's opinion on whether lowlatency is good enough, 
or if we really need -rt and/or -realtime. (Which requires more 
maintainer work.)

>>> Please reply only if you want help.
>> Just to clarify, did you mean "if you need help" (you help me) or "if you
>> want to help" (I help you) ?
> I don't need help unless you want offer me a serious job. Real time
> kernel need help.

Thanks for the clarification.

David Henningsson, Canonical Ltd.

More information about the Ubuntu-Studio-devel mailing list