Initially reported to debian (http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=810964), redirected here:
With AMD Opteron 6xxx processors, half of the memory controllers are missing from /sys/devices/system/edac/mc Checked with single 6120 (dual memory controller) and twin 6344 (2x dual MC), other dual-module CPUs might be affected too. Booting plain Linux (3.2, 3.16, 4.1, 4.3), all memory controllers are listed under /sys/devices/system/edac/mc as expected. Same happens, when Xen 4.1 is used: all MCs present. Starting with Xen 4.4 (Debian Jessie), only mc1 (on the single CPU machine) or mc2/mc3 (dual CPU machine) are present, although the full system memory is accessible. Checked versions were 4.1.4 (Debian Wheezy), 4.4.1 (Jessie) and 4.6.0 (Sid) _______________________________________________ Xen-devel mailing list Xen-devel@lists.xen.org http://lists.xen.org/xen-devel
