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

Chuck Martin dsdhpnw02 at sneakemail.com
Sat Feb 25 20:24:46 EST 2006


On Wed, Feb 08, 2006 at 11:20:38PM +0100, Florian Schmidt mista.tapas-at-gmx.net |LAU| wrote:
> > Any other suggestions?  The original problem is that the system clock
> > is extremely slow, causing the time to be off and things like "sleep 1"
> > to take 10 to 30 times as long as they should.
> 
> Hmm, 
> 
> try with or without high resolution timer support compiled in. Also if
> you can confirm it doesn't happen with vanilla, i'd suggest reporting
> this to Ingo.

Nothing in the responses so far from this list has solved the problem.
I reported it to Ingo on Feb. 10, and received no reply.  I've since
compiled and tested a number of patched kernels, and I've determined
that the problem began with patch-2.6.13-rt13, since the problem occurs
with patch-2.6.13-rt13, but not with patch-2.6.13-rt12.  I then reported
this finding to Ingo on Feb. 22, and I still haven't received a reply.

Is there anyone on this list familiar enough with the kernel and the
realtime patches to give me a clue as to where to start looking?  I
can't find a changelog for the realtime patches anywhere, and looking
at a diff of the source trees for both patched kernels doesn't turn up
anything obvious.  I know C, but am unfamiliar with the kernel code,
and trying to understand it enough to know where to begin looking will
probably take some time.  Any help that might shorten the amount of
time I have to study the code would be much appreciated.  Thanks.

Chuck




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