Kernel-lowlatency vs kernel-rt

[Ho Wan Chan]

-lowlatency kernels aren't from KXStudio, it is in the official Ubuntu
repositories, and we include it in our live images. Andy Whitcroft of
Canonical is the main maintainer of the -lowlatency kernels, though I think
our kernel team (mainly zequence) wants to maintain the precise kernels.

-rt kernels are from the KXStudio repos. However I use -lowlatency kernel
3.5.0.17, and it works great.

smartboyhw
On Nov 3, 2012 8:44 AM, "ttoine" <ttoine at ttoine.net> wrote:

> I am running 3.5.0.17 -lowlatency, I think from KXstudio repositories.
> Works great with Ubuntu 12.10.
>
>
> 2012/11/3 Kaj Ailomaa <zequence at mousike.me>
>
>> On Fri, 02 Nov 2012 23:58:39 +0100, Ralf Mardorf <
>> ralf.mardorf at alice-dsl.net> wrote:
>>
>>  Hi :)
>>>
>>> on Ubuntu Studio Quantal I switched to
>>> $ uname -a
>>> Linux qrc 3.6.5-rt14 #1 SMP PREEMPT RT Fri Nov 2 21:36:37 CET 2012
>>> x86_64 x86_64 x86_64 GNU/Linux
>>>
>>> A kernel-rt seems to be much better on my machine.
>>>
>>> With the kernel-lowlatency for a very small audio session, CPU usage
>>> "< 10%", I get xruns with
>>>
>>> sample_rate=48000
>>> frames_period=512
>>>
>>> Now, with the kernel-rt everything seems to be [Ok] with
>>>
>>> frames_period=256
>>>
>>> but with frames_period=128 I get xruns again.
>>>
>>> Regards,
>>> Ralf
>>>
>>>
>> Did you compare with a lowlatency of the same kernel version?
>> If not, the test is not very conclusive.
>>
>> If you like to see some good results from a lowlatency kernel, try
>> 2.6.37, and perhaps also 2.6.38 and 2.6.39
>> As you might have experienced, something made kernels less reliable from
>> somewhere around version 3.
>> I haven't tried 3.6 series yet.
>>
>>
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