Kernel configuration - Was: Re: (No subject)

[Ralf Mardorf]

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