diff --git a/garlic/postprocess/filter/fetch b/garlic/postprocess/filter/fetch
new file mode 100755
index 0000000..8890c29
--- /dev/null
+++ b/garlic/postprocess/filter/fetch
@@ -0,0 +1,2 @@
+#!/bin/sh
+rsync -a mn1:go/$1 .
diff --git a/garlic/postprocess/filter/filter b/garlic/postprocess/filter/filter
new file mode 100755
index 0000000..78527bc
--- /dev/null
+++ b/garlic/postprocess/filter/filter
@@ -0,0 +1,18 @@
+#!/bin/sh
+
+for unit in $1/*; do
+	#echo unit=$unit
+	bs=$(jq ".blocksize" "$unit/garlic_config.json")
+	#echo bs=$bs
+
+	awk '/^time /{print $2}' > time.$bs $unit/stdout.log
+
+	N=$(wc -l "time.$bs" | awk '{print $1}')
+	#echo N=$N
+
+	if [ $N -lt 30 ]; then
+		echo "too few points ($N) in unit $unit"
+		#exit 1
+	fi
+
+done
diff --git a/garlic/postprocess/filter/plot.gnuplot b/garlic/postprocess/filter/plot.gnuplot
new file mode 100644
index 0000000..a9abefc
--- /dev/null
+++ b/garlic/postprocess/filter/plot.gnuplot
@@ -0,0 +1,17 @@
+set terminal png size 800,800
+set output 'out.png'
+
+set xrange [16:1024]
+set nokey
+set logscale x 2
+set logscale y 2
+set grid
+
+set xlabel "blocksize"
+set ylabel "time (s)"
+
+plot 'time.32'  using (32):1  with circles title "32", \
+     'time.64'  using (64):1  with circles title "64", \
+     'time.128' using (128):1 with circles title "128", \
+     'time.256' using (256):1 with circles title "256", \
+     'time.512' using (512):1 with circles title "512"