Re: [PATCH] Preemption Latency Measurement Tool

Roger Larsson
2001-09-21T01:58:13Z

On Friday 21 September 2001 03.38, Roger Larsson wrote:
> On Friday 21 September 2001 03.03, Alan Cox wrote:
> > > If this analysis is correct:
> > > We really need to run RT processes with RT priorities!
> > >
> > > It is also possible that multimedia applications needs to be rewritten
> > > = to
> >
> > I dont believe this is an application problem. Applications allocating
> > memory can end up doing page outs for other people. Its really important
> > they dont get stuck doing a huge amount of pageout work for someone else.
> > Thats one thing I seem to be seeing with the 10pre11 VM.
> >
> > Sound cards have a lot of buffering, we are talking 64-128Kbytes + on
> > card buffers. Thats 0.25-0.5 seconds at 48Khz 16bit stereo
>
> Hmm..
>
> The yield we do in __alloc_pages is it really correct?
> 1. Suppose it is not we that are the problem.
> 2. Suppose there are lots of other processes that gets to run.
> 3. If kswapd had higher prio, it would start to run without us giving up...
>
> I have to try...
>

They were already gone in -pre12!
But I was running -pre10...
Others?
Dieter is running -pre12...
I will test it anyways...

/RogerL

--
Roger Larsson
Skellefteå
Sweden