I bought 3 different low profile video cards to try and get rid of that latency message. The ultimate and best solution was to buy the MESA 7i92H. Does away with the parallel port completely. John Dammeyer
> -----Original Message----- > From: Thomas D. Dean [mailto:[email protected]] > Sent: December-15-19 9:46 PM > To: 'Enhanced Machine Controller (EMC)' > Subject: [Emc-users] Latency Warning Messages > > My CNC computer was purchased several years ago from Sherline with CNC > installed. > > I have two disk drives. One has linuxcnc-2.7.14-wheezy.iso and the > other has linuxcnc-stretch-uspace-amd64.iso. > > On both OS's, I see 'unexpected latency warning messages', infrequent on > 'wheezy' and 99% of the time at linuxcnc startup on 'stretch'. The > latency test shows jitter around 40us for 'wheezy' and 100us for 'stretch'. > > The cpu is Intel Atom CPU D2500 @ 1.86GHz > It has 1G memory. > Lots of free disk space. > > lspci shows: > 00:02.0 VGA compatible controller: Intel Corporation Atom Processor > D2xxx/N2xxx Integrated Graphics Controller (rev 0b) > > and lspci -v shows: > 00:02.0 VGA compatible controller: Intel Corporation Atom Processor > D2xxx/N2xxx Integrated Graphics Controller (rev 0b) (prog-if 00 [VGA > controller]) > Subsystem: Intel Corporation Atom Processor D2xxx/N2xxx > Integrated Graphics Controller > Flags: bus master, fast devsel, latency 0, IRQ 29 > Memory at 40100000 (32-bit, non-prefetchable) [size=1M] > I/O ports at 20d0 [size=8] > [virtual] Expansion ROM at 000c0000 [disabled] [size=128K] > Capabilities: [d0] Power Management version 2 > Capabilities: [b0] Vendor Specific Information: Len=07 <?> > Capabilities: [90] MSI: Enable+ Count=1/1 Maskable- 64bit- > Kernel driver in use: gma500 > Kernel modules: gma500_gfx > > Looks like the on-board video adapter shares main memory with the CPU. > Linuxcnc system requirements says this is a no=no. > > Question: Will installing a PCI video card likely to reduce the latency > and eliminate the warnings? > > Tom Dean > > > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
