On Wed, Jul 18, 2007 at 12:08:48PM +0200, M. Koehrer wrote: > a while ago I posted already a mail concerning this question. > http://www.mail-archive.com/rtnet-users@lists.sourceforge.net/msg01687.html > The question was if rtnet will support Ingo Molnar's kernel_preempt > patch. As there is already a native rtdm the missing pieces are to > extend the native rtdm (or to create another variant of rtdm for the > kernel preempt_patch). Also, the build system of rtnet has to be > adapted to support this. Are there any news on this issue?
We are currently doing some research in order to find out what is possible with the vanilla Linux network stack and determinism. Although it is a little bit too early for solid results, the first tests we did today indicate that it is possible to get 200 ... 300 us round trip time between two boxes, both running 2.6.22.1-rt9 (although no real load on the boxes yet, so no worst case). The histograms show that most round trip times are around 100 us. The code is standard userspace POSIX code, using raw and packet sockets. Before we'll provide more measurement results we have to code proper load scenarios. Robert -- Dipl.-Ing. Robert Schwebel | http://www.pengutronix.de Pengutronix - Linux Solutions for Science and Industry Handelsregister: Amtsgericht Hildesheim, HRA 2686 Hannoversche Str. 2, 31134 Hildesheim, Germany Phone: +49-5121-206917-0 | Fax: +49-5121-206917-9 ------------------------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now >> http://get.splunk.com/ _______________________________________________ RTnet-users mailing list RTnet-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/rtnet-users
