after fetching, data must be reduced to at least chart resolution, else some data...

[rrdtool-all.git] / program / src / rrd_graph.c

diff --git a/program/src/rrd_graph.c b/program/src/rrd_graph.c
index b9d954757fdfeb979371a677ede66a6a7fadf793..d90a02e9eae9dd82bfcdfdb5473174439d410231 100644 (file)
--- a/program/src/rrd_graph.c
+++ b/program/src/rrd_graph.c
@@ -855,6 +855,10 @@ int data_fetch(
             }
             im->gdes[i].data_first = 1;
 
+            /* must reduce to at least im->step
+               otherwhise we end up with more data than we can handle in the 
+               chart and visibility of data will be random */            
+            im->gdes[i].step = max(im->gdes[i].step,im->step);
             if (ft_step < im->gdes[i].step) {
                 reduce_data(im->gdes[i].cf_reduce,
                             ft_step,