On Thu, 2011-06-23 at 12:00 +0000, linux-audio-user-request@xxxxxxxxxxxxxxxxxxxx wrote: > > Message: 1 > Date: Thu, 23 Jun 2011 08:42:15 +0100 > From: Rui Nuno Capela <rncbc@xxxxxxxxx> > Subject: Re: Kernel 2.6.39 > To: linux-audio-user@xxxxxxxxxxxxxxxxxxxx > Message-ID: <4E02EE57.7020003@xxxxxxxxx> > Content-Type: text/plain; charset=ISO-8859-1; format=flowed > > On 06/23/2011 07:17 AM, Ralf Mardorf wrote: > > > > 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@xxxxxxxxx > > > ------------------------------ > > Message: 2 > Date: Thu, 23 Jun 2011 00:59:29 -0700 (PDT) > From: James Warden <warjamy@xxxxxxxxx> > Subject: Re: Kernel 2.6.39 > To: linux-audio-user@xxxxxxxxxxxxxxxxxxxx > Message-ID: > <1308815969.6124.YahooMailClassic@xxxxxxxxxxxxxxxxxxxxxxxxxxx> > Content-Type: text/plain; charset=us-ascii > > > > --- On Thu, 6/23/11, Rui Nuno Capela <rncbc@xxxxxxxxx> wrote: > > > From: Rui Nuno Capela <rncbc@xxxxxxxxx> > > Subject: Re: Kernel 2.6.39 > > To: linux-audio-user@xxxxxxxxxxxxxxxxxxxx > > Date: Thursday, June 23, 2011, 3:42 AM > > On 06/23/2011 07:17 AM, Ralf Mardorf > > wrote: > > > > > > 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. > > > > 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. 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: > Oberhausen at 11:30 Julien, this is the Ruhrgebiet city I'm living :D. _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/listinfo/linux-audio-user
