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From: "Petri Helenius" <pete@he.iki.fi>
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cc: freebsd-performance@freebsd.org
cc: Kai Mosebach <kai.mosebach@freshx.de>
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Subject: Re: LinuxThreads replacement
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> 
> It's not as simple as that. In practice a lot of factors about
> your system and the type of work you're doing will affect the
> performance. On paper, the SA/KSE method is supposed to combine
> the best aspects of 1:1 (libthr) and N:1 (libc_r), and should
> threoretically be "better" than either one. But, in practice,
> complexity and overhead may drown out the performance gains.
> Conversely, context switching overhead may not be as great a
> penalty for the 1:1 model on modern cpus.
> 
Anyone have any numbers of different architechtures for the context
switch? AMD64? Itanium? i386? PPC? Sparc? How about interrupt
latency? SMP coherency overhead? 

The basic memory bandwidth has become a marketing thing so 
the raw megabytes per second are readily available but in multiprocessor
and multithreaded environment there is a lot more into it.

Pete