problem of disk threads whith every rt kernel, except with kernel-2.6.31.11! - Was: Re: Kernel configuration - Was: Re: (No subject)

[Ralf Mardorf]

On Sun, 2011-02-13 at 09:24 +0100, Ralf Mardorf wrote:
> On Sat, 2011-01-29 at 22:02 +0100, Victor henri wrote:
> > Hello: 
> > 
> > I have a problem since almost one year now. I'm using linuxsampler,
> > that allows that load very big sample files (one of my .gig file is
> > 1.6 G for only one piano sound); this use disk streaming.
> > 
> > I always have such problem only when i use the RT kernel : 
> > 
> > 0x7f6eef1ee860 Disk stream not available in time! 
> > 
> > After several message slike that, i get :
> > 
> > DiskThread: there was no free slot
> > Disk stream order failed!
> > 
> > Then the sounds clicks, then stops for 10 to 20 seconds, then i can
> > play again, then it'll come again...
> > 
> > This arrives on both Gentoo and Ubuntu 10.10 64 bits; BUT there is one
> > thing however : there is ONE kernel with wich it doesn't arrive : the
> > 2.6.31.11-rt from Ubuntu lucid (RT kernel was in the repositories in
> > Ubuntu untill 10.04 Lucid, then now i have to either take it  from
> > Abogani's ppa (for lucid or natty) or compile it myself with the
> > rt-patch from kernel.org; i've tried all of that, and nothings works,
> > except for the 2.6.31.11-rt from in the repositories of Ubuntu
> > Lucid-updates)
> > 
> > Here are some technical details:
> >     - I have laptop Asus Core i7 for gamers (supposed to be very
> > fast);to be noted : it also happens on another Asus Core I7, but NOT
> > on an another Asus Core i3; 4Go RAM;
> >     - when i compile myself i choose : real-time preemption (of
> > course) and Timer frequency 1000 Hz, either on Gentoo or on Ubuntu
> > with kernel from kernel.org; nothing else is changed in Ubuntu.
> >     - i've tried with the no-op cfq scheduler also; i use ext3 on
> > Gentoo and ext4 on Ubuntu;
> >     - have a nvidia graphic card, but no proprietary driver
> > installed....
> > 
> > i have posted that at the linuxsampler mailing list without succes....
> > 
> > Could please someone help me? i LOVE RT-kernel and its
> > capabilities.... What is it in the linux-rt package that is not
> > somewhere else and that allows things to work for me....? 
> > 
> > Thank you
> > 
> > Victor
> 
> Did you test what will happen, if you copy the configuration of the
> 2.6.31.11-rt from Ubuntu Lucid to the source directory, instead of
> making your own configuration? Rename it from 'config-2.6.31.11-rt' to
> '.config' in the source directory, before you build the kernel. If you
> run make oldconfig nothing should be asked.
> 
> Hth,
> 
> Ralf