On optimising the scheduler for large run queues

[Jamie Lokier]

Jan-Simon Pendry wrote:
> so, which way is linux going?  you tell me - there doesn't seem to
> be a "right" answer here.  this may well mean there needs to be two
> schedulers, one with ultra-low overhead for desktops, and another,
> with better scalability, for servers.

Desktops don't need ultra-low overhead at the levels being discussed
here.  Desktops don't do much scheduling at all.

They need good process _selection_ criteria for that maximum pleasure,
deep interactive experience.  (I.e. move the mouse and the pointer moves
in X even though you've got 3 parallel compiles running).

But a few cycles missed in the scheduler is not a big deal for typical
desktop uses.

-- Jamie


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