Merge pull request #87 from hagezi/patch-1

Add performance settings to unbound.conf

rootfs_overlay/etc/unbound/unbound.conf

@@ -74,6 +74,9 @@ server:
     # This only applies to domains that have been frequently queried
     prefetch: yes
 
+    # Fetch DS records earlier (DNSSEC): more cpu usage, less latency
+    prefetch-key: yes
+    
     # One thread should be sufficient, can be increased on beefy machines.
     # In reality for most users running on small networks or on a single machine,
     # it should be unnecessary to seek performance enhancement by increasing num-threads above 1.
@@ -83,6 +86,15 @@ server:
     # (requires CAP_NET_ADMIN or privileged)
     # so-rcvbuf: 1m
 
+    # Increase cache size to utilize more RAM
+    msg-cache-size: 64m
+    rrset-cache-size: 128m
+
+    # This attempts to reduce latency by serving the outdated record before
+    # updating it instead of the other way around
+    # Default: cache-min-ttl: 0
+    serve-expired: yes
+
     # The netblock is given as an IP4 or IP6 address with /size appended for a
     # classless network block. The action can be deny, refuse, allow or allow_snoop.
     access-control: 127.0.0.1/32 allow