10 Feb
2016
10 Feb
'16
9:53 a.m.
I used 3.18.25 from kernel.org, applied this patch: patch-3.18.25-rt23.patch.gz
<https://www.kernel.org/pub/linux/kernel/projects/rt/3.18/patch-3.18.25-rt23.patch.gz>.
The only option is changed from the default was "Fully Preemptible Kernel (RT)”.
After that I had to edit kernel/locking/locktorture.c. an comment out the line
#include <linux/rwlock.h>
or it wouldn’t compile. (this part took me a while to figure out).
This reason I choose this kernel was to stay close the the kernel version already
installed on my system (3.19.x). I have to admit, i know very little about different
kernel versions…
If I would do it again, i would probably start out with the low-latency config rather than
the default, but i’m not sure it it would make a difference.
One caveat though, I haven’t tested this kernel very thoroughly, so i’m not even sure it
won’t blow up in my face if I were to try and send an email or something :-)
And also, I don’t seem to get hardware video acceleration (I have a intel builtin gpu). I
don’t case for this too much as i plan to run this project in console only…
I’m not sure how much there is to be gained by turning off all kinds of features in the
kernel, but i know that trying this out takes a lot of time, especially if you don’t
really know what you’re doing :-)
cheers.
Fokke
On Feb 8, 2016, at 12:14 , Harry van Haaren
<harryhaaren(a)gmail.com> wrote:
On Mon, Feb 8, 2016 at 10:07 AM, Fokke de Jong <fokkedejong(a)gmail.com
<mailto:fokkedejong@gmail.com>> wrote:
And the result is super-stable audio with a period of 32 samples @48Khz (for a total
roundtrip latency of 3.5ms).
Congrats, that's pretty solid! Would you share some details on what config options
you used, and which kernel it is?
I think it would be great if the Linux Audio community built up a list of kernel config
options that need changing for optimal audio performance.
Cheers, -Harry
--
http://www.openavproductions.com <http://www.openavproductions.com/>