Jan, On you last comment below about pre allocating buffers, I am trying to find where in the RTAI examples it show that?
Glen On 9/28/10 5:35 PM, "Jan Kiszka" <[email protected]> wrote: > Am 28.09.2010 23:17, Glen Wernersbach wrote: >> Jan, >> >> My basic concern was to keep the data flowing from the NIC to my program as >> close to hard real time as possible. I know doing Linux calls can break hard >> real time especially when I want to receive a UDP packet every 1ms. > > Is that UDP packet part of your control loop? Why do you need the whole > opener stack then? Or is there more? > >> >> The only thing Ethernet IP really gives you real time is optional support >> for the Ethernet 1588 timing standard so you know what the jitter was in >> receiving the packet over the Ethernet line. The 1588 support is not yet >> implemented in opener. The rest is just a protocol for handling critical >> data over TCP and UDP. Unfortunately, I have a device that needs to work on >> Allen Bradley controllers which only support this real time protocol. >> >> All I want to do is replace the Linux calls in networkhandler.c >> (socket,bind,listen...) with RTAI real time calls. > > Additionally, you will have to configure the socket resources, namely > how many buffers each socket should pre-allocate for its real-time > operation (that's the major difference to normal networking stack that > do on-demand allocations). See the examples. > > Jan > -- Glen Wernersbach President & CTO Jetsoft Development Co. 629 Old St Rt. 74 Suite 210 Cincinnati, Oh 45244 Custom Programming Web Site: www.jetsoftdev.com Retail Products Web Site: www.scanhelp.com Phone: 513-528-6660 Fax: 513-528-3470 ---- "Support Dyslexia Research" ------------------------------------------------------------------------------ Special Offer-- Download ArcSight Logger for FREE (a $49 USD value)! Finally, a world-class log management solution at an even better price-free! Download using promo code Free_Logger_4_Dev2Dev. Offer expires February 28th, so secure your free ArcSight Logger TODAY! http://p.sf.net/sfu/arcsight-sfd2d _______________________________________________ RTnet-developers mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/rtnet-developers
