bump default max_concurrent_requests to 500, update config comment

also raise 1024 bytes to 4096 bytes in minimum max_request_size check

Signed-off-by: strawberry <strawberry@puppygock.gay>

conduwuit-example.toml

@@ -55,12 +55,20 @@ port = 6167
 # likely need this to be 0.0.0.0. 
 address = "127.0.0.1"
 
-# How many requests conduwuit sends to other servers at the same time. Default is 100
-# Note that because conduwuit is very fast unlike other homeserver implementations,
-# setting this too high could inadvertently result in ratelimits kicking in, or
-# overloading lower-end homeservers out there. Recommended to leave this alone unless you
-# have a valid reason to. No this will not speed up room joins.
-#max_concurrent_requests = 100
+# How many requests conduwuit sends to other servers at the same time concurrently. Default is 500
+# Note that because conduwuit is very fast unlike other homeserver implementations, setting this too
+# high could inadvertently result in ratelimits kicking in, or overloading lower-end homeservers out there.
+#
+# A valid use-case for enabling this is if you have a significant amount of overall federation activity
+# such as many rooms joined/tracked, and many servers in the true destination cache caused by that. Upon
+# rebooting conduwuit, depending on how fast your resources are, client and incoming federation requests
+# may timeout or be "stalled" for a period of time due to hitting the max concurrent requests limit from
+# refreshing federation/destination caches and such.
+#
+# If you have a lot of active users on your homeserver, you will definitely need to raise this.
+#
+# No this will not speed up room joins.
+#max_concurrent_requests = 500
 
 # Max request size for file uploads
 max_request_size = 20_000_000 # in bytes

src/config/mod.rs

@@ -402,7 +402,7 @@ fn default_max_request_size() -> u32 {
 }
 
 fn default_max_concurrent_requests() -> u16 {
-    100
+    500
 }
 
 fn default_max_fetch_prev_events() -> u16 {

src/database/mod.rs

@@ -260,8 +260,8 @@ pub async fn load_or_create(config: Config) -> Result<()> {
             return Err(Error::bad_config("Registration token is empty"));
         }
 
-        if config.max_request_size < 1024 {
-            error!(?config.max_request_size, "Max request size is less than 1KB. Please increase it.");
+        if config.max_request_size < 4096 {
+            error!(?config.max_request_size, "Max request size is less than 4KB. Please increase it.");
         }
 
         let (presence_sender, presence_receiver) = mpsc::unbounded_channel();