Describe performance optimisation in INSTALL and mention DPD in README

1 files changed, 20 insertions, 0 deletions

diff --git a/INSTALL b/INSTALL
index 5b67803..a11fd63 100644
--- a/INSTALL
+++ b/INSTALL
@@ -28,6 +28,10 @@ The configure script can be launch with a variety of options:
  --disable-output-uhd   Disable the binding to the UHD driver for USRPs
  --enable-fast-math     Compile using the -ffast-math option that gives a substantial
                         speedup at the cost of correctness.
+ --disable-native       Do not compile ODR-DabMod with -march=native compiler option.
+                        This is meant for distribution package maintainers who want to
+                        use their own march option, and for people running into compilation
+                        issues due to -march=native. (e.g. GCC bug 70132 on ARM systems)
 
 Debugging options: You should not enable debug if you need good performance.
 By default, debug is disabled.
@@ -38,6 +42,22 @@ For more information, call:
 
     % ./configure --help
 
+Performance optimisation
+------------------------
+While the performance of modern systems is in most cases good enough to
+run ODR-DabMod, it is sometimes necessary to increase the compilation
+optimisation if all features are used or on slow systems.
+
+Tricks for best performance:
+
+    * Do not use --disable-native
+    * Use --enable-fast-math
+    * Add -O3 to compiler flags
+
+Applying all together:
+
+    % CFLAGS="-O3" CXXFLAGS="-O3" ./configure --enable-fast-math
+
 Nearly as simple install procedure using repository:
 ====================================================