Messages in this thread |  | | From | Dieter Nützel <> | Subject | Re: Feedback on preemptible kernel patch | Date | Thu, 20 Sep 2001 08:40:56 +0200 |
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Am Mittwoch, 19. September 2001 01:31 schrieb Robert Love: > On Tue, 2001-09-18 at 14:18, Roger Larsson wrote: > > Do you run with the playback process reniced -N? > > It should really run with a low SCHED_FIFO or SCHED_RT policy. > > But renicing it with a negative value gives some of the benefits... > > (but you need to run as root) > > In addition to this the program might need to lock its pages down - the > > only thing I can think of that could cause several seconds delay would > > be if it has been swapped out... > > Certainly giving it a higher priority should improve results (especially > with preemption), but the application should receive a fair amount of > process attention as it is, as it is TASK_RUNNABLE at all times and the > disk I/O should be routinely preempted. I am interested how much > renicing it helps, though.
Nearly zero :-)
> Now, if it has to swap pages, that is a very good point. I tend to > blame this, or perhaps something with a long held lock (the audio > driver?) for the blips.
System didn't go into swap during whole test, sorry.
> Its so hard to tell swap/VM issues now with all the VM work, sadly...:)
I point to the second;-)
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