Andrea Arcangeli wrote:
> On Tue, 12 Sep 2000, Martin Dalecki wrote:
> >First of all: In the case of the mp3 player and such there is already a
> >proper way to give it better chances on getting it's job done smooth -
> >RT kernel sceduler priorities and proper IO buffering. I did something
> >to a GDI printer driver...
> Take 2.2.15, set a buffer of 128mbyte (of course assume your mp3 is larger
> than 128mbyte :) and then run in background `cp /dev/zero .` in the same
> fs where your mp3 file out of cache is living. Then you'll see why a large
> buffer is useless if there's none kind of I/O fair scheduling into the
> elevator. Repeat the same test in 2.2.16 then.
> The I/O latency Hans was taking about for the mp3 player, is the time it
> takes for the buffer to become empty.
I was talking about *proper* buffering not necessary *big* buffers.
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This archive was generated by hypermail 2b29 : Fri Sep 15 2000 - 21:00:19 EST