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+---- Thread: in search for the /boot/config-...... file (/showthread.php?tid=1147)
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in search for the /boot/config-...... file - pelgrim - 05-25-2016
running Ubuntu
In order to start working with midi signals, I follow this guide
http://tedfelix.com/linux/linux-midi.html
Under the title: Installing a Low Latency Kernel
I need to change the kernel config file:
Code:
$ grep ^CONFIG_HZ /boot/config-`uname -r`
CONFIG_HZ_1000=y
CONFIG_HZ=1000in the /boot directory I can not find any config file.
Where can I do this ?
RE: in search for the /boot/config-...... file - martinayotte - 05-25-2016
This is related to kernel build config, therefore you would need to compile your own kernel.
The current value in longsleep builds is CONFIG_HZ=100 and no define for CONFIG_HZ_1000.
RE: in search for the /boot/config-...... file - pelgrim - 05-25-2016
does that mean I can't use my pine64 for midi recording ?
RE: in search for the /boot/config-...... file - dkryder - 05-25-2016
if kernel does not include PREEMPT try this,
$ sudo apt-get install linux-lowlatency
not sure if that will fix it in ubuntu, but your goal is to have a low latency kernel
also, you should start reading about kernels and this fellows guide. perhaps sending him emails will help.
but he did mention this,
Note: Ubuntu/Debian can set up a properly configured audio group for you when you install jackd2. If you'd like, you can do this before continuing:
$ sudo apt-get install jackd2
have you done that yet?
RE: in search for the /boot/config-...... file - pelgrim - 05-25-2016
I have executed all until the lowlatency part, including the jackd2.
Since the kernel does include PREEMPT, I didn't install the linux-lowlatency package.
But you're right, I should give it a try, nothing to loose but time.
just tried:
unable to locate package linux-lowlatency.
RE: in search for the /boot/config-...... file - dkryder - 05-25-2016
if the kernel includes the PREEMPT then according to the guide it is a low latency. so no need for the package. also you should have a workable kernel. just carry on with next step.
also, this guy should host a forum or at least have a mail list but i did only see this,
http://tedfelix.com/email.html
probably best to contact him going forward. good luck and let us know how it works.
you might find current setting in /usr/src/linux-headers*/.config but to change a re-compile, as mentioned by martinayotte, would be needed
RE: in search for the /boot/config-...... file - martinayotte - 05-25-2016
In longsleep kernel build the flag CONFIG_PREEMPT seems to be there :
CONFIG_TREE_PREEMPT_RCU=y
CONFIG_PREEMPT_RCU=y
CONFIG_PREEMPT_NOTIFIERS=y
# CONFIG_PREEMPT_NONE is not set
# CONFIG_PREEMPT_VOLUNTARY is not set
CONFIG_PREEMPT=y
CONFIG_PREEMPT_COUNT=y
CONFIG_DEBUG_PREEMPT=y
# CONFIG_PREEMPT_TRACER is not set
RE: in search for the /boot/config-...... file - pelgrim - 05-26-2016
I'm indeed moving on now ignoring this setting,
trying to sort things out in another thread to load the snd_seq module in the kernel
RE: in search for the /boot/config-...... file - longsleep - 05-26-2016
# CONFIG_SND_SEQUENCER is not set
You need to build your own Kernel for that for now. Create a PR on GitHub if you want it to be enabled in my builds.
RE: in search for the /boot/config-...... file - longsleep - 05-26-2016
I just released Kernel 3.10.101-4-pine64-longsleep-51 which has the sound sequencer.