Are you sure those numbers are ns and not cpu clock cycles? Also you may want to ask Pico-Systems if the ppmc even has any chance of communicating as fast as you are wanting it to. (and for a pp card recommendation.)
-----Original Message----- From: Maxime Lemonnier [mailto:[email protected]] Sent: Thursday, March 22, 2018 9:46 AM To: Enhanced Machine Controller (EMC) <[email protected]> Subject: Re: [Emc-users] Looking for anyone with a Pico Systems Univ PWM card *and* a pci-e parport rt-preempt made no difference (well my HAL Latency Test are even better) Unplugging the second ppmc card cut the time roughly in half (expected) 22 s32 OUT 277802 ppmc.0.read.time 22 s32 OUT 194461 ppmc.0.write.time 16 s32 OUT 486932 servo-thread.time I conclude that the NetMos chips are just slow. sad. I can't even do 2KHz safely with these timings. On Thu, Mar 22, 2018 at 9:22 AM, Maxime Lemonnier < [email protected]> wrote: > Interesting, more in line with what I would expect. What lspci -vv > tells you about the chip on the PCI card? > > As I wrote you this morning I did try another PCI card I found: > > NetMos Technology PCI 9865 Multi-I/O Controller (prog-if 03 > [IEEE1284]) > > The PCI card is even worse: > > 10 s32 OUT 534652 ppmc.0.read.time > 10 s32 OUT 366536 ppmc.0.write.time > 8 s32 OUT 907936 servo-thread.time > > > Maybe I could try to boot in rt-preempt (using rtai right now) > > On Wed, Mar 21, 2018 at 9:46 PM, Jon Elson <[email protected]> wrote: > >> On 03/21/2018 03:15 PM, Maxime Lemonnier wrote: >> >> OK, I checked my system with a mediocre Dell Pentium 4 CPU and a PCI >> card, and ONE universal PWM controller. ppmc.0.write was 60 us, max >> was 95 us. >> ppmc.0.read was 128 us, max 188 us. >> The total thread was running 386 us. >> This is a Debian Wheezy system with the rt-preempt kernel. >> >> Jon >> >> ------------------------------------------------------------ >> ------------------ >> Check out the vibrant tech community on one of the world's most >> engaging tech sites, Slashdot.org! http://sdm.link/slashdot >> _______________________________________________ >> Emc-users mailing list >> [email protected] >> https://lists.sourceforge.net/lists/listinfo/emc-users >> > > ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
