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Old 08-10-2009, 01:55 PM   #16
orgcandman
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Registered: May 2002
Location: dracut MA
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Quote:
Originally Posted by paulsm4 View Post
2. You you think you're actually going to *get* nanosecond resolution, you're probably mistaken (even with decent hardware, up-to-date kernels, and realtime extensions)(and *certainly* with most other, non-Linux multitasking, preemptable operating systems; including most/all flavors of Unix and Windows).
This is the most important thing to grasp. Linux was NEVER originally designed as a high-resolution realtime system. In fact, WindRiver runs the RTCore/RTL module for a reason - linux (and most unix flavors) will NEVER reach that kind of granularity. The RTCore/RTL mod pushes linux as a low-priority task in a much more "real-time" system with much better latency numbers.

-Aaron
 
Old 08-10-2009, 02:13 PM   #17
selalerer
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Summing it up.

Thanks for all the replies.

Just to clarify :-):
  • I know what a millisecond, microsecond and nanosecond is.
  • I did not think the resolution I got is nanoseconds just because the interface is in nanoseconds.
  • Our product needs to process complex events in latencies of up to 10 milliseconds (and millions of those per second) and it does that in our tests on other platforms.
  • We require time sampling resolution of about 1 microsecond or higher. Considering the requirements, I do not think that this is a design defect.
  • We are just now starting to port to Linux.

Upgrade the Linux machine is what I'm going to ask (and pass this as a requirement to our clients as well).

It is still a bit of a disappointment for me to find that Linux from not so long ago does not expose properly the underlying machines ability to user applications.

Thanks again for all the information,
Sela.
 
  


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