Sat, 18 Mar 2000 Alain Rollé wrote:
> To end with, one more question :
> In the RTL manifesto is stated that :
> "You can have deterministic worst case behaviour time on Solaris RT, but the
> worst case is really worse than you might be willing to tolerate"
> Can anyone give me an indication of the worst case time between the moment a
> hardware interrupt is detected by the processor and the moment an interrupt
> handler starts to execute with Solaris RT. I can't seem to find these figures
> on the sun site.
Well, I had a look, and I can't find anything but "...in a future version of
this document." Where are the figures? I actually thought Solaris had hard RT,
thanks to their brutal rape of their kernel (ie making it fully preemptive),
but if it's hard to find the figures (if they exist), one starts to wonder if
they're hiding something...
Anyway, AFAIK, their solution is basically meant for real time multimedia and
that kind of stuff, which means that worst case latencies in the ms range are
acceptable. We're not dealing with latencies in the same order of magnitude as
RTLinux, QNX and other dedicated RT solutions. You just can't get that
throughout the system without compromising non-RT performance.
With Linux + lowlatency (hard RT for user space), we are pretty certain that we
can guarantee sub ms latencies for SCHED_FIFO threads on correctly configured
P133+ systems, and we're still dealing with a non-preemptive kernel. If
Solaris has worse performance, it'd better have some other significant
advantages to warrant the extra complexity, or Sun has wasted a lot of time...
*hehe*
Regards,
//David
P r o f e s s i o n a l L i n u x A u d i o
· ··-------------------------------------------------·· ·
MuCoS - http://www.linuxdj.com/mucos
Audiality - http://www.angelfire.com/or/audiality
David Olofson - [EMAIL PROTECTED]
-- [rtl] ---
To unsubscribe:
echo "unsubscribe rtl" | mail [EMAIL PROTECTED] OR
echo "unsubscribe rtl <Your_email>" | mail [EMAIL PROTECTED]
---
For more information on Real-Time Linux see:
http://www.rtlinux.org/rtlinux/
