On Thursday, May 17, 2012 10:33:42 PM Kent A. Reed did opine: > On 5/17/2012 4:18 PM, gene heskett wrote: > > On Thursday, May 17, 2012 03:56:00 PM andy pugh did opine: > >> On 17 May 2012 14:33, Jan de Kruyf<jan.de.kr...@gmail.com> wrote: > >>> Andy > >>> Until we do proper tests: see the OSADL numbers for the various > >>> board / cpu setups > >> > >> The Core2Duo system they have looks like it would software-step > >> perfectly adequately > >> https://www.osadl.org/Latency-plot-of-system-in-rack-1-slot.qa-latenc > >> ypl ot-r1s2.0.html > >> > >> Some of the other systems look decidedly poor, which is a shame > >> because what LinuxCNC really needs is a reliable works-on-any-system > >> RT layer. > > > > Looking at some of the other results, I am amazed at the generally > > poor performance of the ARM's in general. > > > > 25 years ago, looking for the reason I could literally spend days > > trying to download some of the early programs for the TRS-80 Color > > Computer. which at that point had a motorola MC68A09EP in it for a > > cpu, running at .889 mhz. <...> > > > > Then that once a minute ghost trace disappeared and I could download > > major sized bits of programming without rzsz ever detecting or > > needing to correct an error. > > > > The point being, that if a processor that runs at .889 mhz can do it > > in 15 microseconds, why can't a modern cpu running at 2000 times the > > 6809's speed, do it in 7.5 nanoseconds? Somethings wrong with this > > picture. > > > > Cheers, Gene > > Oh, please, stop before you get me started reminiscing about Z80 cards > stuck into my homebrew Apple II :-) Seeing rzsz in print was a bit of a > shock. Sorry 'bout that. :) In fact, the several hundred people who still have working coco's, including me, (we have a mailing list with about this lists traffic level) are using the rzsz package that I compiled on the well equipt coco3 in the basement. But I had to fix the compiler, then threw away some of Chuck Foresburgs code, switching to a table lookup method of checking crc's that was about 20x faster than Chucks code. Between that and one other little tweek I used dozens of times in the final version of what I built (version 3.36) I raised the throughput on the coco from just over 400 cps, to about 740 cps.
Those folks are having the 23rd annual "Last CoCo Fest" in Elgin IL this weekend. And if they get their expenses back, they'll have a 24th Last CoCo Fest next year. One of the venders is bringing a socket adaptor to fit the atari 8 bitters that puts a 6809 in an atari, running os9 no less. > I seem to remember posting a rant to the emc-users list a year or more > ago lamenting this "progress" toward cpus and graphics chips optimized > for multimedia and/or games to the exclusion of everything else. I > suspect the line managers are like a boss I once had, always ready to > jump to the next bandwagon and absolutely incapable of admitting they've > given something up in the process. It's hard to argue with them raking > in the big bucks. > > A friend of mine clued me into a psychological/sociological phenomenon > known as "shifting baseline." With a little massaging, I think it could > be used to explain our current circumstance. > Probably, Kent. But I have other things to do. Someone has likely even invented a word for it. ;) > Regards, > Kent > > > ------------------------------------------------------------------------ > ------ Live Security Virtual Conference > Exclusive live event will cover all the ways today's security and > threat landscape has changed and how IT managers can respond. > Discussions will include endpoint security, mobile security and the > latest in malware threats. > http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ > _______________________________________________ > Emc-developers mailing list > Emc-developers@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-developers Cheers, Gene -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) My web page: <http://coyoteden.dyndns-free.com:85/gene> A good supervisor can step on your toes without messing up your shine. ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ Emc-developers mailing list Emc-developers@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-developers
