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Peter Humphrey wrote:
> 
> The kernel includes three schedulers: anticipatory, deadline and (the 
> default) CFQ, whereas the author refers only to "old" and "new" schedulers. 
> I wonder which of the features he describes are common to all three. I also 
> wonder which kernel version introduced the "new" scheduler. I have a reason 
> for this interest, which I intend to describe in a separate thread.
> 

Those are the IO schedulers.  He was referring to the O(1) process
scheduler.  The former handles block device contention, the latter
handles CPU contention.  Both are important, but these days IO
scheduling is more likely to be the source of slowness...
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