> On Jan 5, 2015, at 1:19 PM, Sebastian Kuzminsky <s...@highlab.com> wrote: >> Servo thread Max Jitter: 770360 >> Base thread Max Jitter: 771712 > > Ouch!
Indeed. > I dont know about any effort to make isolcpus not required any more. Ok, perhaps someone should fix the last part of that page...? > There is no difference in latency between different versions of > LinuxCNC, what matters is the RTAI kernel version. If you're running > from the 2.6 Live/Install Image, you'll be running the new RTAI kernel, > which has very different latency behaviors on some hardware. > > Use lstopo to see what vcpus share the L2 cache of the last vcpu, then > use isolcpus to isolate them all. That may help. > Thanks Seb. I did this and now have isolcpus=1 and it seems to be better behaved already. After running for an hour or so Max Jitter is 29293 which would be fine for my application... I will let it run all night and see if the outrageous jitter occurs again. > Maybe memleak (Alec, our RTAI expert) can help identify any other things > to try? If anyone has other suggestions to improve latency, please do tell. -Tom ------------------------------------------------------------------------------ Dive into the World of Parallel Programming! The Go Parallel Website, sponsored by Intel and developed in partnership with Slashdot Media, is your hub for all things parallel software development, from weekly thought leadership blogs to news, videos, case studies, tutorials and more. Take a look and join the conversation now. http://goparallel.sourceforge.net _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
