X-Git-Url: https://gerrit.opnfv.org/gerrit/gitweb?a=blobdiff_plain;f=kernel%2Farch%2Fx86%2Fconfigs%2FREADME.opnfv;fp=kernel%2Farch%2Fx86%2Fconfigs%2FREADME.opnfv;h=752ff7ba54e16a156842e4eeb5f3814e55b6c51a;hb=977317100f3b52caafb091ad5924e5dd81982433;hp=0000000000000000000000000000000000000000;hpb=0c2f88aa2ccffc538c276caac88da6841107bf81;p=kvmfornfv.git

diff --git a/kernel/arch/x86/configs/README.opnfv b/kernel/arch/x86/configs/README.opnfv
new file mode 100644
index 000000000..752ff7ba5
--- /dev/null
+++ b/kernel/arch/x86/configs/README.opnfv
@@ -0,0 +1,19 @@
+As the ubuntu 16.04 is based on 4.4 kernel, thus we can try to refer the config
+file for opnfv config file.
+
+The arch/x86/configs/config-4.4.0-62-generic is the config file used by ubuntu
+kernel. Comparing with the opnfv kernel, the key differences are:
+ a. Real time config support like NOHZ_FULL, PREMEPMT kernel, different RCU
+mechanism,
+ b.  Disabling some feature that may impact real time result, like power
+management functionality (C/P state). The hotplug support is disabled also
+temply now.
+ c.  Some ubuntu specific driver is not copied.
+ d. Some difference of build-in/module selection, because some config items
+are selected automatically and we don't figure out the default value difference
+yet. 
+ e. Some virtualization support like Xen/HyperV is not enabled yet, to avoid
+potential impact.
+
+In future, we should leave only item a/b and remove the differences caused by
+item c/d/e.