Re: [announce] [patch] ultra-scalable O(1) SMP and UP scheduler

From: Davide Libenzi (
Date: Sat Jan 05 2002 - 21:12:59 EST

On Sun, 6 Jan 2002, Alan Cox wrote:

> > Ingo, you don't need that many queues, 32 are more than sufficent.
> > If you look at the distribution you'll see that it matters ( for
> > interactive feel ) only the very first ( top ) queues, while lower ones
> > can very easily tollerate a FIFO pickup w/out bad feelings.
> 64 queues costs a tiny amount more than 32 queues. If you can get it down
> to eight or nine queues with no actual cost (espcially for non realtime queues)
> then it represents a huge win since an 8bit ffz can be done by lookup table
> and that is fast on all processors

It's here that i want to go, but i'd liketo do it gradually :)

unsigned char first_bit[255];

- Davide

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