Kirk Wallace wrote: > On Wed, 2008-08-13 at 12:03 -0500, Jon Elson wrote: > >>John Kasunich wrote: >> >> >>>Unfortunately, conversion from clocks to time is non-trivial, so we >>>simply report the results in clocks. The situation is getting worse, >>>not better. In the name of "progress", we now have to deal with CPUs >>>that change their clock frequencies on the fly. I've even heard a >>>report that on some modern CPUs, the TSC can no longer even be counted >>>on to be monotonic. >> >>Newer Intel and AMD CPUs have thermal protection logic that >>causes it to skip clocks when geting hot, and shuts off the >>clock when severely overheated (150 C die temp). Just what you >>need in a guaranteed-latency real-time system! >> >>Jon > > > Are there other CPU's that would better cater to realtime? Some sort of > lean, fast RISC, not designed to cope with Windows "upgrades". >
The Arm 7 (and newer Arm 9) CPUs look quite good, and start at $12 or so. They need VERY little support stuff, either. The AD Sharc series (now called Blackfin) is even faster, but a bit trickier to program efficiently. Jon ------------------------------------------------------------------------- This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK & win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100&url=/ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
