i'm not sure threads can share an RT signal queue. wouldn't that be
required in order to dispatch work from RT signals amongst several
threads?
> One other observation, which an engineer from Netscape (who does IMAP
> server implementations for Linux and NT) points out is that NT
> completion ports have two features which RT SIGIO doesn't provide. One
> is processor affinity; on SMP systems, when a completion port becomes
> ready, the system will try to schedule the callback thread on the same
> processor which registered the callback originally. The other is thing
> which NT does is LIFO ordering when multiple completion ports are to be
> scheduled. Both of these strategies are an attempt to avoid cache
> misses.
while LIFO preserves CPU cache contents, it can be grossly unfair under
load, as you pointed out later. but that may even be moot if sigwaitinfo
can deliver a vector of events at once, instead of just a single event.
- Chuck Lever
-- corporate: <chuckl@netscape.com> personal: <chucklever@netscape.net> or <cel@monkey.org>The Linux Scalability project: http://www.citi.umich.edu/projects/linux-scalability/
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