Xen devel - Aug 2005 - Event channel questions

All-

The interface docs discuss event channels, and state "they provide little
bandwidth for communication per se, and hence are typically married with a
piece of shared memory to produce effective and high-performance
inter-domain communication".

Can someone help define ''little bandwidth'' and
''high-performance'' in less
than relataive terms? What is an appropriate application of the event
channel if it is low bandwidth?

Also, are there examples around of using event channels, both with and
without grant tables?

Thanks!

Carl

- --

"There are 10 types of people in the world: Those who understand binary
and those that don''t."

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On 1 Aug 2005, at 21:37, Carl Holtje ;021;vcsg6; wrote:
> Can someone help define ''little bandwidth'' and
''high-performance'' in
> less
> than relataive terms? What is an appropriate application of the event
> channel if it is low bandwidth?
Little bandwidth == one ''sticky bit'' of information that is
cleared by
the receiver. It''s an event pending bit.

High performance == when you send an event, teh receiver will receive 
an upcall sometime later. The mechanisms involved are simple so the CPU 
overhead is dominated by context switch time, if a context switch is 
required.

  -- Keir



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