[elrepo] Realtime kernel for audio/games?

[Ljubomir Ljubojevic]

On 10/13/2014 01:23 PM, Ljubomir Ljubojevic wrote:
> On 10/13/2014 01:19 PM, Ljubomir Ljubojevic wrote:
>> Hi guys.
>>
>> Is there any desire, or even need to create a realtime kernel aimed at
>> audio/games?
>>
>> Since Desktop/gaming system and servers have different priorities, I was
>> wondering how things are with current CentOS kernels. For CentOS 5 there
>> were CCRMA kernels.
>>
>> Non-Gaming purpose would be for audio conversion/streaming.
>>
> 
> Understanding low latency
> 
> Summary
> 
> Summarizing, you need tuned drivers that do not disable interrupts for
> long, low latency patches in the kernel so that the scheduler runs often
> enough and your application itself has to run with the SCHED_FIFO
> scheduling policy so that it gets the best chance of grabbing the
> processor when it needs it.
> 
> When everything is in place things work incredibly well. The system can
> be running an audio task with no dropouts and a few milliseconds of
> latency while the computer is being loaded with disk accesses, screen
> refreshes and whatnot. The mouse gets jerky, windows update very slowly
> but not a dropout to be heard.
> 
> I wonder if anybody got this far :-)
> http://ccrma.stanford.edu/planetccrma/software/understandlowlat.html
> 

I apologize for not doing some research later, I went back to CCRMA and
found out that there is repositories for Fedora 19, so patching
your/stock kernels should be fairly straightforward.

http://ccrma.stanford.edu/planetccrma/software/installplanettwenty.html

http://ccrma.stanford.edu/planetccrma/mirror/fedora/linux/planetccrma/19/SRPMS/

I will contact the maintainer if he would create a branch for CentOS 7
and report back.

-- 
Ljubomir Ljubojevic
(Love is in the Air)
PL Computers
Serbia, Europe

StarOS, Mikrotik and CentOS/RHEL/Linux consultant