[Linux-ia64] web page on O(1) scheduler

[Linux-ia64] web page on O(1) scheduler

[David Mosberger]

Recently, I started to look into some odd performance behaviors of the
O(1) scheduler.  I decided to document what I found in a web page
at:

	http://www.hpl.hp.com/research/linux/kernel/o1.php

(it may take another couple of hours before the pages show up outside
the HP firewall, so if you get "page not found" at the moment, don't
be surprised).

I should say that I have no direct stake in the CPU scheduler (never
worked on it, not sure I ever would want to), but I feel that it's
worthwhile to at least document the O(1) scheduler a bit better.
Also, I do feel that the O(1) scheduler currently has rather poor
"long-term" properties.  It would be nice if some of those properties
could be improved without hurting the other excellent properties of
the current O(1) scheduler.

I think the web pages should be most relevant to the HPTC (high
performance technical computing) community, since this is the
community that is most likely affected by some of the performance
oddities of the O(1) scheduler.  Certainly anyone using OpenMP on
Intel platforms (x86 and ia64) may want to take a look.

Comments welcome.

	--david

Re: [Linux-ia64] web page on O(1) scheduler

[David Mosberger]

It has been pointed out that on the main web page
(http://www.hpl.hp.com/research/linux/kernel/o1.php) it is very
difficult to see that the section entitled "Some problems with the
O(1) scheduler" contains links to the full problem descriptions (the
links aren't underlined and the color looks almost black).

So, in case you missed that, please do click on those links to get the
full description.

I'll see what we can do to improve the layout of the page.

Thanks,

	--david