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- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
This archive was generated by hypermail 2b29 : Sun Sep 23 2001 - 21:00:28 EST