Messages in this thread |  | | Date | Tue, 18 Sep 2001 19:31:28 -0400 | From | Robert Love <> | Subject | Re: Feedback on preemptible kernel patch |
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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.
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.
Its so hard to tell swap/VM issues now with all the VM work, sadly...:)
-- Robert M. Love rml at ufl.edu rml at tech9.net
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