From: Matt Corallo <git@bluematt.me>
Date: Sat, 15 Jun 2024 15:31:48 +0000 (+0000)
Subject: Clarify what collision_prob is calculating for users
X-Git-Url: http://git.bitcoin.ninja/index.cgi?a=commitdiff_plain;h=22574c7a573751bfe6c1a1006a17727577b150ea;p=flowspec-xdp

Clarify what collision_prob is calculating for users
---

diff --git a/collision_prob.py b/collision_prob.py
index 36df0c9..9d3ee7d 100644
--- a/collision_prob.py
+++ b/collision_prob.py
@@ -40,36 +40,40 @@ def print_entry(e, t, b):
 #print_entry(300, 20000, 1)
 #print_entry(300, 20000*2, 2)
 
-print("Table and bucket sizes mapped to rough element count which has a 1% bucket-overflow probability")
-print("Note that we currently have a hard-coded bucket size of 16 elements")
+print("For each table size below, we list the number of sources before a bucket storing 16 entries")
+print(" has a 1% chance of overflowing, cause it to spuriously accept packets from all 16 sources.")
+#print("Note that we currently have a hard-coded bucket size of 16 elements")
+print()
+print("Entry sizes are generally 16 bytes for IPv4 or IPv6 matching source /64s or less.")
+print(" When matching IPv6 sources longer than /64s entries are 32 bytes.")
 print()
 
 print("128K table * 16 bytes = %dMiB." % (128*16/1024))
-print_entry(4000, 128*1024, 4)
-print_entry(15000, 128*1024, 8)
+#print_entry(4000, 128*1024, 4)
+#print_entry(15000, 128*1024, 8)
 print_entry(33000, 128*1024, 16)
-print_entry(53000, 128*1024, 32)
+#print_entry(53000, 128*1024, 32)
 
 print("256K table * 16 bytes = %dMiB." % (256*16/1024))
-print_entry(7000, 256*1024, 4)
-print_entry(28000, 256*1024, 8)
+#print_entry(7000, 256*1024, 4)
+#print_entry(28000, 256*1024, 8)
 print_entry(63000, 256*1024, 16)
-print_entry(104000, 256*1024, 32)
+#print_entry(104000, 256*1024, 32)
 
 print("512K table * 16 bytes = %dMiB." % (512*16/1024))
-print_entry(13000, 512*1024, 4)
-print_entry(52000, 512*1024, 8)
+#print_entry(13000, 512*1024, 4)
+#print_entry(52000, 512*1024, 8)
 print_entry(119000, 512*1024, 16)
-print_entry(200000, 512*1024, 32)
+#print_entry(200000, 512*1024, 32)
 
 print("1M table * 16 bytes = %dMiB." % (1024*16/1024))
-print_entry(23000, 1024*1024, 4)
-print_entry(95000, 1024*1024, 8)
+#print_entry(23000, 1024*1024, 4)
+#print_entry(95000, 1024*1024, 8)
 print_entry(227000, 1024*1024, 16)
-print_entry(387000, 1024*1024, 32)
+#print_entry(387000, 1024*1024, 32)
 
 print("2M table * 16 bytes = %dMiB." % (2*1024*16/1024))
-print_entry(40000, 2*1024*1024, 4)
-print_entry(175000, 2*1024*1024, 8)
+#print_entry(40000, 2*1024*1024, 4)
+#print_entry(175000, 2*1024*1024, 8)
 print_entry(431000, 2*1024*1024, 16)
-print_entry(749000, 2*1024*1024, 32)
+#print_entry(749000, 2*1024*1024, 32)