RELENG_7 jerky mouse and skipping sound (still a problem -BETA3)

Kris Kennaway kris at
Sun Dec 30 04:50:57 PST 2007

Kip Macy wrote:
> On Nov 19, 2007 9:53 AM, Anish Mistry <mistry.7 at> wrote:
>> On Wednesday 07 November 2007, Anish Mistry wrote:
>>> On Monday 05 November 2007, [LoN]Kamikaze wrote:
>>>> Marc Fonvieille wrote:
>>>>> On Thu, Oct 18, 2007 at 05:53:47PM +0200, [LoN]Kamikaze wrote:
>>>>>> Anish Mistry wrote:
>>>>>>> On Thursday 18 October 2007, Marc Fonvieille wrote:
>>>>>>>> On Wed, Oct 17, 2007 at 12:28:30PM -0400, Anish Mistry wrote:
>>>>>>>>> I just updated to RELENG_7 from 6.2 and I'm running into
>>>>>>>>> some really annoying issues with jerky mouse movement and
>>>>>>>>> skipping sound.  This seems to be similar to:
>>>>>>>>> Re: SCHED_4BSD in RELENG_7 disturbs workflow
>>>>>>>>> This happens both with 4BSD and ULE.
>>>>>>>>> I seems to happen when I'm compiling ports and a new
>>>>>>>>> cc/bzip2/sh process fires off (I'm just watching top), I'll
>>>>>>>>> get the skip/freezeup.
>>>>>>>> [...]
>>>>>>>> Using ULE and UP kernel (i.e. without SMP etc.) helped a bit
>>>>>>>> the things but it's still very annoying to use firefox
>>>>>>>> during ports build.  I see this lag/freeze on all boxes I
>>>>>>>> use with 7.0, but it's true that with a fast machine people
>>>>>>>> can ignore the problem, it's less obvious than with a 1GHz
>>>>>>>> box for example.
>>>>>>> Yeah, I'm still seeing this behavior.  Does anyone have
>>>>>>> suggestions on debugging?
>>>>>>> Thanks,
>>>>>> I did post the solution in this thread.
>>>>> It has nothing to do with the mouse.
>>>> Does the problem persist for you? It's gone for me, even with
>>>> moused.
>>> Yes, the problem seems to have been fixed.  I'm back to
>>> kern.hz=1000 and removed FULL_PREEMPTION.  No skipping.
>> It looks like I spoke too soon.  I've just tried to compile miro and
>> as it was compiling the boost-python dependency I noticed the problem
>> again.  Switching kern.hz="100" seems to fix the problem.  Can any of
>> the developers in this area reproduce the issue?  It's pretty easy to
>> reproduce on my 1.33Ghz Athlon.
> There is an ithread priority inversion bug that might be causing this.
> The fix for that should be going in shortly.
>  -Kip
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Can you confirm that this fix helped for you?  i.e. do you still see the 


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