On Sunday 01 December 2019 14:44:06 Chris Albertson wrote: > In general, notebook computers are optimized for size and battery > life. But Linux based CNC is running in Raspberry Pi and even smaller > and lower performance computers and dong fine. Performance is not > needed. What is needed is low latency real-time performance. > > Even that can be relative. When moving the machine with an fpga card such as one of the Mesa cards, extremely low latency, like needed for driving steppers with software stepper generators, is not required. With the kernel my rpi4 is running, and abusing it badly, the worst case latency is nominally 180 microseconds, plenty quick enough to keep the card happy. The only time I've seen a stutter is when driving it with the keyboard, there I get a random stop that resembles lifting my finger off the key for a couple hundred milisecs. Its clean and steady running gcode, or from the mdi interface.
The reason I've been quiet isn't medical, but Friday night as I was sending my last msg about sundown, I smelled a hot odor, and when I looked around I had a small flame and a cloud of motherboard smoke that took a fire extinguisher to quell, coming out of the tower that was this machine. I put out the fire and took the 4 HD's out so they wouldn't get a cold shock when I wheeled the rest of it out to the back porch. So now I'm running a very old & slow dell, booted from this machines HD, w/o enough memory to run kmail and firefox at the same time. And sorting thru the mobo choices to assemble a newer, somewhat faster machine with buckets of memory, so I'm thinking of a 65 watt core i5 (6 core), an asus 370 or 390 ATX board with 6 sata ports, some usb-3.1's and 32GB of ddr4 ram. IEEE-1394 (firewire) seems to have fallen by the wayside, and thats the interface I run my movie camera from, a Sony Handi-cam thats 2x sharper than ntsc. So I may have to rustle up a 1394 card. If I can't find one, but I think there might be one in this midden heap. Someplace, if I dig deep enough. I had a digital tv card whose rear end was touching one of the usb-2 breakout cables on the now 12 year old & partially burnt asus board, which is apparently where the short that started the fire took place. I don't think it was the mobo, but sloppy made usb-2 breakout, its welded into the mobo socket now. Sure stunk up the place though. > On Sun, Dec 1, 2019 at 4:03 AM Nicklas Karlsson < > > nicklas.karlsso...@gmail.com> wrote: > > Checked once and concluded in general Laptops is a little bit more > > expensive and have a little bit less perfomance in some combination. > > Internal expansion ports are also limited. > > > > This should come as no suprise unless ordinary computer is similar > > in size. In general a smaller diameter 2.5 inch should be expected > > to have less storage capacity than a 3.5 inch, there is also a need > > to limit power use. > > > > Think 3D graphics card may detoriate real time perfomance, large > > burst transfer of memory block databus? > > > > > Hey guys. > > > > > > I saw that some guys are using laptops with linuxcnc. I only want > > > them > > > > for > > > > > testing. Just wondering what laptops are good and any tricks to > > > set it up. I'm using Mesa pci cards so that might be a problem > > > with a laptop. But any ideas would be appreciated. > > > > > > Regards. > > > Andrew > > > > > > _______________________________________________ > > > 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 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) If we desire respect for the law, we must first make the law respectable. - Louis D. Brandeis Genes Web page <http://geneslinuxbox.net:6309/gene> _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
