Re: [proaudio] Setting up realtime

[Mysth-R <mysthr21@xxxxxxxxx>]

Hi,

I Tried to compile a new kernel all the week end, and now I got it ! Here is what to do to compile a 2.6.25.4-rt5 kernel : 

$ su -
# cd /usr/src
# wget http://www.kernel.org/pub/linux/kernel/v2.6/linux-2.6.25.4.tar.gz  //get the 2.6.25.4 kernel
# wget http://rt.et.redhat.com/download/older/patch-2.6.25.4-rt5.bz2  // get the RT patch for this kernel

Uncompress these to files. then : 

# mv linux-2.6.25.4 linux-2.6.25.4-rt5
# rm linux                                          //to remove any symlink
# ln -s linux-2.6.25.4-rt5 linux                    // to create a new symlink.
# cd linux                                            // You will work in this directory linked to your linux-2.6.25.4-rt5 directory.
# patch -p1 < ../patch-2.6.25.4-rt5       // apply the patch to make your new kernel RT


Perhaps there is others patches ?  but this is the most important to use RT. (If anyone could tells us if there is others patches ?..)

# make clean        // not necessary the first time, but necessary you want to compile another time
# zcat /proc/config.gz > .config         // to get your current kernel .config
# make oldconfig

Then you can configure your kernel according to your needs.

# make menuconfig
# make && make modules_install
# cp arch/i386/boot/bzImage /boot/kernel-2.6.25.4-rt5
# cp System.map /boot/System.map-2.6.25.4-rt5

Then edit your /boot/grub/menu/lst


This is the way to compile your kernel.
Now as Christian tolds you there is some option you must activate to get really good performances.
You can desactivate all options you do not needs (scsi, pcmcia, etc...)

good luck

2008/6/9 Arve Barsnes <arve..barsnes@xxxxxxxxx>:

Nevermind, found it. Will recompile and try it when I get home.

On Mon, Jun 9, 2008 at 7:04 AM, Arve Barsnes <arve.barsnes@xxxxxxxxx> wrote:
> Okay,  I had group scheduling activated, and a grep of my config shows
> CFQ as not being the default IO scheduler. Couldn't find the setting
> in menuconfig right now so I'll have to check more when I get back
> home from work. Thanks for the tips though.
>
> On Mon, Jun 9, 2008 at 12:42 AM, Christian <krampenschiesser@xxxxxxxxxx> wrote:
>> -----BEGIN PGP SIGNED MESSAGE-----
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>> Arve Barsnes schrieb:
>> | Can anyone give a summary of the current method of setting up
>> | realtime? jack is now saying latency is below 1 ms, but it's giving me
>> | an enormous amount of xruns. I'm guessing my kernel isn't completely
>> | correctly set up, and I can't really find any good guides, only vague
>> | hints to add those features, but not those, and whatever you do don't
>> | use this. Might be because the kernels change so much between
>> | versions.
>> |
>> | I've set up pam, configured kernel, done jack config in qjackctl and
>> | set up my .asoundrc by this page: http://gentoo-wiki.com/HOWTO_Jack
>> |
>> | A more specific kernel setup would be welcome, for any kernel you'd
>> | like, I can change versions to fit whatever is easier to explain,
>> | currently running 2.6.24-rt1 from the overlay. Also having
>> | 2.6.25.4-rt1 that was posted on this list a while back, but I don't
>> | know if it is currently configured to run at all. Anything else I need
>> | to do would also be welcome with a good explanation. I've been using
>> | Debian for a few years now, so consider me a n00b to Gentoo, although
>> | I used it a few years ago. :)
>> |
>> | Hope to hear something soon :)
>> |
>> | Regards,
>> | Arve
>> |
>> |
>> |
>> |
>> Deactived group scheduling
>> Use CFQ as default IO scheduler.
>> High Res timer support.
>> Complete Preemption(Real-Time-Patch)
>> 1000hz timer frequency.
>>
>> This does my job.
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>>
>

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