I guess you just convinced me about purchasing a RPi4 and start experimenting with it :). I would love to use one of those for my next project or motherboard replacement.
El jue., 30 de junio de 2022 12:19, gene heskett <ghesk...@shentel.net> escribió: > On 6/30/22 10:47, Thaddeus Waldner wrote: > > Here are some recent experiences with flash storage on a Pi4 as a > > development environment running LinuxCNC 2.8.2. > > > > A while back I posted in this mailing list that using an SSD on the Pi4 > is > > prohibitive because it causes latency issues. At the time, I tested this > on > > a heavily used, repurposed ssd. I later discovered that the SSD was > failing > > due to write wear. This is likely what caused the latency issues in the > > first place. > > > > In the meantime I ran the Pi4 (2GB memory) as a development platform, > > running up to 3 instances of VS Code (1.5GB memory each) along with > Glade, > > browser, etc. This type of usage made short work of the Samsung EVO > microSD > > card. The card wear issue first showed up as spurious latency > violations. A > > bit later the entire system became maddeningly slow and unusable. > > > > Cloning to a fresh sd card solved the problem. > > > > In the process of making backups I also cloned the system to an SSD > (intel > > 320 this time) and to my surprise, it ran with zero latency issues. I > will > > be using SSDs from now on, thank you. > > > > Some takeaways: > > 1) large page files are bad news for cheap flash storage > > 2) "worn out" storage will cause latency issue on low latency systems > > 3) latency tests on a low latency system might be a way to detect flash > > write wear issues. > > > > Thaddeus > This corresponds to my findings re the size of the u-sd, I've had zero > u-sd problems > since I switched to a fast 64G u-sd. Even with the traffic of keeping up > with the buildbot, > about 65 megs re-written daily, its survived nicely for 2+ years now. > Give this stuff > room to do its own maintenance and it Just Works. > > I also have 2 SSD's plugged into usb3 adapters, one of 120G, and one of > 240G that > I do buildbot or kernel building type work on, only problem I've ever > had there was a > bad, non-StarTech usb3 adapter, replaced the adapter, the SSD was fine. > > Been running that way in addition to teaching my 80 yo Sheldon 11x54 > tricks it never > dreamed of doing when it shipped 80 years ago with all the taper > accessories. Now > removed I might add along with a badly broken compound, now a block of > cast for > the correct tool height. > > LinuxCNC does it better, including way wear comp, curved tapers, etc. > > Thanks all. > > Cheers, Gene Heskett. > -- > "There are four boxes to be used in defense of liberty: > soap, ballot, jury, and ammo. Please use in that order." > -Ed Howdershelt (Author, 1940) > If we desire respect for the law, we must first make the law respectable. > - Louis D. Brandeis > Genes Web page <http://geneslinuxbox.net:6309/> > > > > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
