KSE system scope vs non system scope threads

[David Xu]

Can you checkout src/lib/libpthread/thread/thr_spinlock.c revision 1.18 
and see any differents ?

David Xu

Christopher M. Sedore wrote:

> 
>I have a fairly simple question about KSE threads: In a threaded program using KSE threads, what is the effective difference between a system-scope thread and a non-system-scope thread?  If I understand the KSE architecture correctly, there should not be a significant functional difference.  If my reading lead me to the right conclusion, at the nitty-gritty level, there are multiple KSE groups created with system-scope threads, as I understand it, meaning that the kernel scheduler actually does the scheduling work for system-scope threads, instead of the userland KSE scheduler.
> 
>I ask this because I'm observing some behavior that I don't expect.  When running a threaded program with KSE and non-system-scope threads, I see performance degradation in my network traffic when I'm attempting to connect to remote hosts that are down.  Libthr doesn't see this degradation, and KSE with system-scope threads doesn't perform as well as libthr, but is much closer.
> 
>If there is a canonical document that describes all this, a pointer would be very welcome.
> 
>-Chris
>_______________________________________________
>freebsd-threads at freebsd.org mailing list
>http://lists.freebsd.org/mailman/listinfo/freebsd-threads
>To unsubscribe, send any mail to "freebsd-threads-unsubscribe at freebsd.org"
>
>  
>