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</o:shapelayout></xml><![endif]--></head><body lang=EN-NZ link="#0563C1" vlink="#954F72"><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US'>Are you using the generic ethernet driver or one of the provided EtherCAT-enabled drivers? What HZ is your kernel using?<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US'>On standard x86 hardware, you’re unlikely to get much better than 4 ms cycle rates even on Linux+PREEMPT_RT if you’re using the generic driver. Since you’re using more cut-down hardware, it wouldn’t surprise me if this were more limited.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US'><o:p> </o:p></span></p><div style='border:none;border-left:solid blue 1.5pt;padding:0cm 0cm 0cm 4.0pt'><div><div style='border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm 0cm 0cm'><p class=MsoNormal><b><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri",sans-serif'>From:</span></b><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri",sans-serif'> etherlab-users [mailto:etherlab-users-bounces@etherlab.org] <b>On Behalf Of </b>Brian Cheng<br><b>Sent:</b> Tuesday, 17 February 2015 13:44<br><b>To:</b> etherlab-users@etherlab.org<br><b>Subject:</b> [etherlab-users] SKIPPED datagram using Igh EtherCAT master porting for Linux OS on CyconeV SoC<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><div><div><p class=MsoNormal>Hi,<br><br>Does anyone could run short cycle(<<1ms) well using Igh EtherCAT master for linux-RT of Cyclone V (ARM CortexA9 925Mhz) ?<br><br>I got the linux-socfpga.git for downloading Linux-3.10-ltsi-rt.<br>I already put the EtherCAT module & application on the Linux-RT Helio board for Cyclone V.<br>It could run well as communication cycle as 10 ms.<br><br>And the Ethernet port will block when using 1ms transmit rate.<br>SKIPPED datagram always occur.<br>It seems that the delay of ethernet transmit/receive function is too long.<o:p></o:p></p></div><p class=MsoNormal><br>Has anyone already verify the situation or anyone could point out the delay issue?<o:p></o:p></p><div><div id=":lc"><p class=MsoNormal><span style='border:solid windowtext 1.0pt;padding:0cm'><img width=100 height=100 id="_x0000_i1025" src="cid:~WRD140.jpg" alt="Image removed by sender."></span><o:p></o:p></p></div><div id=":lc"><p class=MsoNormal style='margin-bottom:12.0pt'>Thanks a lot.<o:p></o:p></p></div><div id=":lc"><p class=MsoNormal> Brian <o:p></o:p></p></div></div></div></div></div></body></html>