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List: mageia-dev
Subject: Re: [Mageia-dev] mageia sound tasks
From: Sascha Schneider <ungleichklang () gmail ! com>
Date: 2010-12-29 14:22:37
Message-ID: AANLkTikh5YMKx8AEu2xAiVAj1y-GHFmYD6F4H2Nih7W5 () mail ! gmail ! com
[Download RAW message or body]
I made a couple of simple kernel tests with different Mandriva kernels to
see if Kernel-RT is really needed or should be recommanded.
I used the same song in same daw with qjackctl, same everything, except the
kernel.
I used the Hunz-Demo-song in Renoise 2.6 with low Frames in QJackctl to
force some XRUNS on my Laptop with onboard soundcard.
- kernel-desktop-2.6.33.7-2mnb => 14 XRUNS
- kernel-desktop-tmb-desktop-2.6.34-10mdv => 10 XRUNS
- kernel-rt-2.6.33.5-1.rt23.1 => 2 XRUNS
I also use the RTIRQ from Rui Nuno Capela with the Kernel-RT
any other experiences??
regards, saschas
2010/12/22 Sascha Schneider <ungleichklang@gmail.com>
> This sounds great,
>
> latest kernel-tmb I see in the repos (64bit) is 2.6.31
> will test it this eve on my both mashines with my musicapps.
>
> Thanks Thomas
>
> added this kernel as an option to the wiki
>
> regard, saschas
>
> 2010/12/22 Thomas Backlund <tmb@iki.fi>
>
> SaschaS skrev 17.12.2010 18:49:
>>
>> After having a looong chat with the guys from linux4audio and reading
>>> tons of posts in ccrma forum, I must say .....
>>>
>>> Idea with an rt-kernel for netbooks ....... DISMISSED .... it simply
>>> makes no sense.
>>> Those guys mostly use gentoo and build their own kernel for years now
>>> and they gave me the following hints, that also can be found in
>>> discussions of other distributions:
>>> 1) the kernel (without preemption-patch) should have
>>>
>>> Processor type and features>> Preemption Mode>> Complete Preemption
>>> (Real-Time)
>>>
>>
>> This is already enabled in kernel-tmb
>>
>>
>>
>> Processor type and features>> Timer frequency>> 1000 HZ
>>>
>>
>> This is already enabled in all -desktop kernels
>>
>>
>>
>> General setup>> RCU Subsystem>> RCU Implementation (Preemptable
>>> tree-based hierarchical RCU)
>>>
>>
>> This is already enabled in kernel-tmb
>>
>>
>>
>> Proccesor Type and features >> Tickless System (Dynamic Ticks) should
>>> be excluded
>>>
>>
>> This one you can get by booting with "nohz=off" on the kernel command
>> line.
>>
>> --
>> Thomas
>>
>
>
[Attachment #3 (text/html)]
I made a couple of simple kernel tests with different Mandriva kernels to see if \
Kernel-RT is really needed or should be recommanded.<br>I used the same song in same \
daw with qjackctl, same everything, except the kernel.<br>
I used the Hunz-Demo-song in Renoise 2.6 with low Frames in QJackctl to force some \
XRUNS on my Laptop with onboard soundcard.
<ul><li class="level1"><div class="li"> kernel-desktop-2.6.33.7-2mnb \
⇒ 14 XRUNS</div> </li><li class="level1"><div class="li"> \
kernel-desktop-tmb-desktop-2.6.34-10mdv ⇒ 10 XRUNS</div> </li><li \
class="level1"><div class="li"> kernel-rt-2.6.33.5-1.rt23.1 ⇒ \
2 XRUNS</div> </li></ul>I also use the RTIRQ from Rui Nuno Capela with the \
Kernel-RT<br><br>any other experiences??<br><br>regards, saschas<br><br><div \
class="gmail_quote">2010/12/22 Sascha Schneider <span dir="ltr"><<a \
href="mailto:ungleichklang@gmail.com">ungleichklang@gmail.com</a>></span><br> \
<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px \
solid rgb(204, 204, 204); padding-left: 1ex;">This sounds great, <br><br>latest \
kernel-tmb I see in the repos (64bit) is 2.6.31<br>will test it this eve on my both \
mashines with my musicapps.<br> <br>Thanks Thomas<br><br>added this kernel as an \
option to the wiki<br><br> regard, saschas<br> <br><div \
class="gmail_quote">2010/12/22 Thomas Backlund <span dir="ltr"><<a \
href="mailto:tmb@iki.fi" \
target="_blank">tmb@iki.fi</a>></span><div><div></div><div \
class="h5"><br><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; \
border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
SaschaS skrev 17.12.2010 18:49:<div><br>
<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px \
solid rgb(204, 204, 204); padding-left: 1ex;"> After having a looong chat with the \
guys from linux4audio and reading<br> tons of posts in ccrma forum, I must say \
.....<br> <br>
Idea with an rt-kernel for netbooks ....... DISMISSED .... it simply<br>
makes no sense.<br>
Those guys mostly use gentoo and build their own kernel for years now<br>
and they gave me the following hints, that also can be found in<br>
discussions of other distributions:<br>
1) the kernel (without preemption-patch) should have<br>
<br>
Processor type and features>> Preemption Mode>> Complete \
Preemption (Real-Time)<br> </blockquote>
<br></div>
This is already enabled in kernel-tmb<div><br>
<br>
<br>
<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px \
solid rgb(204, 204, 204); padding-left: 1ex;"> Processor type and features>> \
Timer frequency>> 1000 HZ<br> </blockquote>
<br></div>
This is already enabled in all -desktop kernels<div><br>
<br>
<br>
<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px \
solid rgb(204, 204, 204); padding-left: 1ex;"> General setup>> RCU \
Subsystem>> RCU Implementation (Preemptable tree-based hierarchical \
RCU)<br> </blockquote>
<br></div>
This is already enabled in kernel-tmb<div><br>
<br>
<br>
<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px \
solid rgb(204, 204, 204); padding-left: 1ex;"> Proccesor Type and features \
>> Tickless System (Dynamic Ticks) should<br> be excluded<br>
</blockquote>
<br></div>
This one you can get by booting with "nohz=off" on the kernel command \
line.<br> <br>
--<br><font color="#888888">
Thomas<br>
</font></blockquote></div></div></div><br>
</blockquote></div><br>
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