auto import from //depot/cupcake/@135843
diff --git a/atime.awk b/atime.awk
new file mode 100644
index 0000000..b42dec2
--- /dev/null
+++ b/atime.awk
@@ -0,0 +1,18 @@
+$6 ~ /^ack/ && $5 !~ /[SFR]/ {
+ # given a tcpdump ftp trace, output one line for each ack
+ # in the form
+ # <ack time> <seq no>
+ # where <ack time> is the time packet was acked (in seconds with
+ # zero at time of first packet) and <seq no> is the tcp sequence
+ # number of the ack divided by 1024 (i.e., Kbytes acked).
+ #
+ # convert time to seconds
+ n = split ($1,t,":")
+ tim = t[1]*3600 + t[2]*60 + t[3]
+ if (! tzero) {
+ tzero = tim
+ OFS = "\t"
+ }
+ # get packet sequence number
+ printf "%7.2f\t%g\n", tim-tzero, $7/1024
+ }