[linux-audio-dev] HELP:porting linux audio driver to RTLinux(rtlinux core driver)

Jan Depner eviltwin69 at cableone.net
Fri Apr 8 16:04:29 UTC 2005


On Fri, 2005-04-08 at 15:47, Lee Revell wrote:
> On Fri, 2005-04-08 at 10:39 -0500, Jan Depner wrote:
> >     Please, don't think I was being disparaging.  I am absolutely
> > thrilled with the kernel work that has been going on.  This thing
> > rocks!  The last I heard (from contractors working for us who were doing
> > soft real-time on - shudder - Windoze) M$ can only get you to about 30
> > milliseconds.
> 
> I didn't think so, I was just pointing out that Linux is quite close to
> being able to do hard RT OOTB.  Many people don't realize it yet...
> 
> Anyway 30ms seems excessive... what kind of soft RT app was that?  The
> ASIO drivers I used to use go down to 2.6 ms, which doesn't work well, I
> have to use ~5ms.  But that requires tuning the system carefully.
> 

    IIRC part of it was servicing IRIG-B interrupts.  The rest was just
serial port interrupts.  It was a pretty simple thing otherwise they
would have had to use a hard real-time system of some sort.  I tried to
get them to go with Linux but got shot down.

Jan





More information about the Linux-audio-dev mailing list