> Hi everyone > > I am a novice (read: clueless) in Linux internals, so bear with me if I > say something stupid. > On a fresh install of > http://www.linuxcnc.org/iso/linuxcnc-2.7.14-wheezy.iso, on an old > machine AMD Athlon 64. I've been using it for several years with > LinuxCNC, worked, but wanted a newer version. > Latency stays below 7000 ns whatever I do, except if I try to run > ksystemlog (a graphical log viewer) without sudo. As it doesn't have > permission to access /var/log/system without sudo, it display an error > dialog. > When the error happens, the latency spikes a lot, 25 to 70 microseconds. > Running ksystemlog with sudo does not impact the latency. > Trying to set the uid bit on the program leads to the (expected) error > "This process is currently running setuid or setgid. GTK+ does not allow > this therefore Qt cannot use the GTK+ integration.". Interestingly, this > also causes the latency spike.
It is always good to notice things like this. > Of course this is not a significant issue, just something to known about > so that I don't accidentally do it while LinuxCNC is running. But I was > wondering if someone (who, unlike me, knows whats really going on behind > this) might know if there is a larger group of things to avoid doing, > because they might also cause such a latency spike. Or know what I'm > doing wrong. I have noticed pressing on/off button there is sometimes a delay of slightly more than 0.1 seconds. Holding down key so that it auto repeat and delay keep popping in a row. It does not make a difference for on/off but guess it's enough to make a dent in the part if happens for other keys. Ethernet, at least with normal configuration sometimes send other messages not supposed to be there if used to communicate with machine only. _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
