[perf] Mention cairo-perf-compare-backends in the README

1 files changed, 16 insertions, 0 deletions

diff --git a/perf/README b/perf/README
index fd6eb308d..0fc5281b7 100644
--- a/perf/README
+++ b/perf/README
@@ -132,6 +132,22 @@ those tests:
 
     ./cairo-perf-diff -f HEAD -- text
 
+Generating comparisons of different backends
+--------------------------------------------
+An alternate question that is often asked is, "how does the speed of one
+backend compare to another?". cairo-perf-compare-backends can read files
+generated by cairo-perf and produces a comparison of the backends for every
+test.
+
+Again, by way of example:
+
+    # Show relative performance of the backends
+    ./cairo-perf-compare-backends cairo.perf
+
+This will work whether the data files were generate in raw mode (with
+cairo-perf -r) or cooked, (cairo-perf without -r).
+
+
 Creating a new performance test
 -------------------------------
 This is where we could use everybody's help. If you have encountered a