23 Jun
2011
23 Jun
'11
3:10 p.m.
On Thu, 2011-06-23 at 12:00 +0000,
linux-audio-user-request(a)lists.linuxaudio.org wrote:
Message: 1
Date: Thu, 23 Jun 2011 08:42:15 +0100
From: Rui Nuno Capela <rncbc(a)rncbc.org>
Subject: Re: [LAU] Kernel 2.6.39
To: linux-audio-user(a)lists.linuxaudio.org
Message-ID: <4E02EE57.7020003(a)rncbc.org>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
On 06/23/2011 07:17 AM, Ralf Mardorf wrote:
spinymouse@debian:/boot$ less config-2.6.39.1 | grep
ONFIG_IRQ_FORCED_THREADING
CONFIG_IRQ_FORCED_THREADING=y
So I don't need to re-build the kernel?
PAE is irrelevant for me, hence I'm using 64-bit architecture.
Hm, less seems to be less comfortable, I hope I'm allowed to use cat
instead.
$ less /etc/default/grub ... needs to copies, so I fall back to cut, it
needs just one copy.
$ cat /etc/default/grub
# If you change this file, run 'update-grub' afterwards to update
# /boot/grub/grub.cfg.
# For full documentation of the options in this file, see:
# info -f grub -n 'Simple configuration'
GRUB_DEFAULT=0
GRUB_TIMEOUT=5
GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian`
GRUB_CMDLINE_LINUX_DEFAULT="quiet"
GRUB_CMDLINE_LINUX=""
So I need to add
GRUB_CMDLINE_LINUX="threadirqs"
?
Thanks,
Ralf
OT:
I used the config from the self-build kernel 2.6.33.9-rt31 and run
oldconfig only to configure 2.6.39. I didn't make music until now using
this kernel. Yes, I wish to "emulate" the PREEMPT_RT, since common
PREEMPT only kernels never did, what I needed.
What do I need to set?
$ cat config-2.6.39.1 | grep PREEMPT
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
IIUC this is correct?!
yes.
and don't forget to add "threadirqs" to your kernel bootloader
line--only then you'll get "rtirq" to do its magic as it used to do on a
genuine -rt kernel.
PS: SCHED_FF?
SCHED_FF is a process/thread attribute, not a kernel configuration
option--jack does that for you when told to run with realtime scheduling.
byee
--
rncbc aka Rui Nuno Capela
rncbc(a)rncbc.org
------------------------------
Message: 2
Date: Thu, 23 Jun 2011 00:59:29 -0700 (PDT)
From: James Warden <warjamy(a)yahoo.com>
Subject: Re: [LAU] Kernel 2.6.39
To: linux-audio-user(a)lists.linuxaudio.org
Message-ID:
<1308815969.6124.YahooMailClassic(a)web39321.mail.mud.yahoo.com>
Content-Type: text/plain; charset=us-ascii
--- On Thu, 6/23/11, Rui Nuno Capela <rncbc(a)rncbc.org> wrote:
From: Rui Nuno Capela <rncbc(a)rncbc.org>
Subject: Re: [LAU] Kernel 2.6.39
To: linux-audio-user(a)lists.linuxaudio.org
Date: Thursday, June 23, 2011, 3:42 AM
On 06/23/2011 07:17 AM, Ralf Mardorf
wrote:
And remember to use /etc/default/grub to have this threadirqs boot option permanent:
/etc/default/grub : GRUB_CMDLINE_LINUX="threadirqs"
if you are too lazy to compile / recompile /etc, just use the liquorix debian kernel
(http://liquorix.net/)
I use that one (kernel compiled with CONFIG_PREEMPT=y, threadirqs at boot). It does
wonders! I tried the cyclictest mentioned by Rui and I got some quite outstanding numbers
on my system.
(However, the liquorix kernel is not PAE, which prevents the use of more than 4GB RAM for
32bit systems with more than 4GB of physical RAM)
J.
I used the config from the self-build kernel
2.6.33.9-rt31 and run
oldconfig only to configure 2.6.39. I didn't
make
music until now using
this kernel. Yes, I wish to "emulate"
the PREEMPT_RT,
since common
PREEMPT only kernels never did, what I needed.
What do I need to set?
$ cat config-2.6.39.1 | grep PREEMPT
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
IIUC this is correct?!
yes.
and don't forget to add "threadirqs" to your kernel
bootloader
line--only then you'll get "rtirq" to do its magic as it
used to do on a
genuine -rt kernel.
Oberhausen at 11:30
Julien, this is the
Ruhrgebiet city I'm living :D.