Re: Periodic posix timer support broke between 2.6.9-rc1 and

Re: Periodic posix timer support broke between 2.6.9-rc1 and

[Christoph Lameter]

On Tue, 12 Oct 2004, George Anzinger wrote:

> Christoph Lameter wrote:
> > I ran some test programs and discovered that the periodic timer support
> > is broken. The timer is triggered once and then never again. Single shot
> > timers work fine. 2.6.9-rc1 is fine. The first kernel that I tested where
> > I noticed the breakage was 2.6.9-rc1-bk17. 2.6.9-rc2 and following all
> > cannot do periodic timer signals.
> >
> > I looked through the changelog but I cannot see anything that would cause
> > the problem. Roland's patch surely could not have done this.
> >
> > Will try to track this down further, time permitting...
>
> The most likely thing would be failure to do the call back from the signal
> delivery code.

The problem is IA64 arch specific. Works fine on i386.

Re: Periodic posix timer support broke between 2.6.9-rc1 and 2.6.9-rc1-bk17

[George Anzinger]

Christoph Lameter wrote:
> On Tue, 12 Oct 2004, George Anzinger wrote:
> 
> 
>>Christoph Lameter wrote:
>>
>>>I ran some test programs and discovered that the periodic timer support
>>>is broken. The timer is triggered once and then never again. Single shot
>>>timers work fine. 2.6.9-rc1 is fine. The first kernel that I tested where
>>>I noticed the breakage was 2.6.9-rc1-bk17. 2.6.9-rc2 and following all
>>>cannot do periodic timer signals.
>>>
>>>I looked through the changelog but I cannot see anything that would cause
>>>the problem. Roland's patch surely could not have done this.
>>>
>>>Will try to track this down further, time permitting...
>>
>>The most likely thing would be failure to do the call back from the signal
>>delivery code.
> 
> 
> The problem is IA64 arch specific. Works fine on i386.

And I repeat:
The most likely thing would be failure to do the call back from the signal
delivery code.

> 

-- 
George Anzinger   george@mvista.com
High-res-timers:  http://sourceforge.net/projects/high-res-timers/
Preemption patch: http://www.kernel.org/pub/linux/kernel/people/rml

Re: Periodic posix timer support broke between 2.6.9-rc1 and

[Christoph Lameter]

On Wed, 13 Oct 2004, George Anzinger wrote:

> The most likely thing would be failure to do the call back from the signal
> delivery code.

The problem was my setting of the resolution of CLOCK_REALTIME and
CLOCK_MONOTONIC to the resolution of the time interpolator. That screwed
up interval calculation. Fix was submitted to Andrew and Linus and will
hopefully get into 2.6.9 final.