The PPA now has an 'smictrl' utility package for manipulating the SMI register. More info here: http://wiki.linuxcnc.org/cgi-bin/wiki.pl?XenomaiKernelPackages#Latency_spikes_and_SMI
Gilles Chanteperdrix, a Xenomai dev, warned me against enabling SMI workarounds for all kernels. There's no separate kernel module for Xenomai like there is for RTAI, so SMI workarounds can't be manipulated after the kernel compile. This utility by Jan Kiszka, another Xenomai dev, can manipulate the SMI register at runtime. It can also be used for RTAI, PREEMPT_RT or even vanilla kernels. More info here about installing and using: http://wiki.linuxcnc.org/cgi-bin/wiki.pl?XenomaiKernelPackages#Latency_spikes_and_SMI Debian source packaging here: https://github.com/zultron/smictrl-deb There's no documentation for it other than the source and what I wrote on the wiki. This could be a great utility for the general LCNC audience. Current users on RTAI, I assume, enable or disable SMIs globally by loading or unloading a kernel module. The smictrl utility makes it easy to tweak individual registers at runtime without having to compile/recompile the kernel module. It would be great if someone wanted to wrap it up in python and provide docs to make it more user friendly. It would also be nice to have an init script and a config file to make settings configurable and persistent across boots. Volunteers? ;) John On 02/05/2013 01:31 PM, John Morris wrote: > Updated kernel packages again. I'm asking folks to go back and try to > break the vanilla kernel instead of the ubuntu-patched one. > > FOR BROKEN NETWORKING: Skunkworks'/Sam Sokolik's Realtek r8168 ethernet > problem is well-known when driving it with the r8169 driver in the > mainline kernel. Realtek's r8169 and r8168 conflict, and the r8169 > sometimes works (at max 100Mb) to drive the r8168, so that's the one > provided by default. It often fails to work for unknown reasons; a > quick google will confirm. Although Xenomai patches don't touch it > directly, they somehow trigger the problem. Solution is to use the new > r8168 driver package (you should anyway, if you want 1Gb mode to work); > see below to install. > > > NEW TESTERS: > http://wiki.linuxcnc.org/cgi-bin/wiki.pl?XenomaiKernelPackages > > NEW AND EXISTING TESTERS: > > sudo apt-get update > # update kernel and headers (for building LCNC) > sudo apt-get install \ > linux-image-3.5.7-xenomai-2.6.2.1 \ > linux-headers-3.5.7-xenomai-2.6.2.1 > > For folks with the r8168 NIC problem (do this while running the stock > kernel with working network, of course!): > > sudo apt-get install kmod-r8168-modules-3.5.7-xenomai-2.6.2.1 > sudo update-initramfs -u -k 3.5.7-xenomai-2.6.2.1 > > Thanks! > > John > > > On 01/29/2013 09:59 PM, John Morris wrote: >> This time, a new tack: atop the old vanilla 3.5.7 + 2.6.2.1 Xenomai, >> apply the vanilla 3.5.7 to stock ubuntu lts-3.5.0-23.35 diffs. Thanks >> to cradek for the idea. >> >> Note changed package name, to represent addition of ubuntu patches. >> >> sudo apt-get update >> # update kernel and headers (for building LCNC) >> sudo apt-get install \ >> linux-image-3.5.7.2-xenomai-2.6.2.1-ubuntu \ >> linux-headers-3.5.7.2-xenomai-2.6.2.1-ubuntu >> >> Then follow these instructions for building the new integrated RTOS branch: >> >> http://wiki.linuxcnc.org/cgi-bin/wiki.pl?NewRTInstall >> >> Thanks to skunkworks on #linuxcnc-devel for many iterations of testing >> multiple kernels on multiple systems today! >> >> John >> >> >> On 01/27/2013 09:03 PM, John Morris wrote: >>> New xenomai packages in the repo fix the dlopen-skins problem Chris >>> George found and a timer problem Michael Haberler found. >>> >>> Both kernel and xenomai packages are at package release 3. >>> >>> # update repo metadata >>> sudo apt-get update >>> # update xenomai packages >>> sudo apt-get install libxenomai-dev libxenomai1 xenomai-runtime >>> # sudo apt-get install xenomai-doc linux-patch-xenomai # optional >>> # update kernel >>> sudo apt-get install linux-image-3.5.7-xenomai-2.6.2.1 >>> >>> Thanks, fellas, for testing! >>> >>> Anyone else who feels like jumping in: >>> http://wiki.linuxcnc.org/cgi-bin/wiki.pl?XenomaiKernel >>> >>> John >>> >>> >>> >>> >>> ------------------------------------------------------------------------------ >>> Master Visual Studio, SharePoint, SQL, ASP.NET, C# 2012, HTML5, CSS, >>> MVC, Windows 8 Apps, JavaScript and much more. 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