[linux-audio-user] Re: Realtime Kernel Slows My Clock

[Lee Revell]

On Tue, 2006-02-07 at 17:16 -0500, Lee Revell wrote:
> On Tue, 2006-02-07 at 23:06 +0100, Nigel Henry wrote:
> > On Tuesday 07 February 2006 19:12, Chuck Martin wrote:
> > > On Tue, Feb 07, 2006 at 09:30:15PM +1100, Loki Davison 
> > loki.davison-at-gmail.com |LAU| wrote:
> > > > On 2/7/06, Chuck Martin <dsdhpnw02 at sneakemail.com> wrote:
> > > > > I've been trying to get a realtime kernel running, but every kernel
> > > > > I've tried with a realtime patch slows my clock to a crawl, which
> > > > > causes my time (as shown with the date command) to be off.  It also
> > > > > causes any program that has a delay to wait far longer than it should. 
> > > > > "sleep 1" can take anywhere from 10 to 30 seconds.
> > > > >
> > > > > My most recent try was with patch-2.6.15-rt16, which I've tried
> > > > > applying to both the 2.6.15 and 2.6.15.2 kernels, with the same result.
> > > > >  Does anyone have any idea what I could be doing wrong, since no one
> > > > > else on this list seems to be having this problem.
> > > >
> > > > Dual core amd 64 or not?
> > >
> > > No and no.  600MHz Pentium III.
> > >
> > > Chuck
> 
> Do you have the problem with 2.6.15.x (the non-realtime kernel)?
> 

Hmm, IIRC this might have been related to the softirq timer thread being
preempted - try setting it to the maximum RT priorirty (99).

Lee