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SubjectRe: (reiserfs) Re: More on 2.2.18pre2aa2
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
> >fine
> >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
> >similiar
> >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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