On 8/28/2012 4:18 PM, Gene Heskett wrote: > On Tuesday 28 August 2012 16:00:29 Lars Segerlund did opine: > >> <...> >> > Lars S. & the rest of the developers: > > Perhaps we should, after getting linuxcnc to actually limp w/o crashing on > a semi-stock -rt version of a recent kernel, develop a test scenario that > could be run on any multicore cpu. > > 1: do the usual stuff at boot time like turn off the hyperthreading, and > set the last cpu core as reserved, like we do for the dual core atoms with > the isolcpus=1, or whatever bit mask in needed to select the 3rd core on my > phenom. > > 2. If latency-test does not now, but I believe it does already, train it > to run itself on the isolcpus=core. > > 3. From that, we can develop a baseline that tells us how far we have to > go, either in terms of buying a hardware stepgen board, or how much farther > we need to go to be able to run software step generation.
It seems to me we already have all this available to us now (except for the minor problem of having a version to test!). It's the same reasoning that led to the existing latency-test page on the wiki. The more people who test and post, the more reliable the decisions we can make. Certainly, I'd post results for a different kind of LinuxCNC just as I do now for when I get my hands on different kinds of hardware platforms. Without such data, this is all just a noisy face-off in the school playground. > 4. If its obvious that we will need hardware stepgens, no doubt there will > be some who will fall by the wayside because of that expense, but ATM I can > probably afford to follow this path. How many of the older & retired folks > among us that can afford this remains to be seen. However, speaking for > myself, I can probably swing it unless Dee's final expenses deplete our $. > That time is approaching as I'm having trouble getting enough food into her > to hold her already lifetime slim 100-110 lb weight. My heart aches for you, Gene. 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 [email protected] https://lists.sourceforge.net/lists/listinfo/emc-developers
