A bit of a hybrid commit, sorry. Provides various default pre-allocations that seem reasonable, and fixup on bus permissions.

src/rust/Cargo.lock

@@ -1308,6 +1308,7 @@ dependencies = [
  "criterion",
  "log",
  "lqos_config",
+ "lqos_utils",
  "nix",
  "serde",
  "tokio",

src/rust/lqos_bus/Cargo.toml

@@ -12,6 +12,7 @@ serde = { version = "1.0", features = ["derive"] }
 bincode = "1"
 anyhow = "1"
 lqos_config = { path = "../lqos_config" }
+lqos_utils = { path = "../lqos_utils" }
 tokio = { version = "1.22", features = [ "rt", "macros", "net", "io-util", "time" ] }
 log = "0"
 nix = "0"

src/rust/lqos_bus/src/bus/client.rs

@@ -1,6 +1,7 @@
 use tokio::{net::UnixStream, io::{AsyncWriteExt, AsyncReadExt}};
 use crate::{BUS_SOCKET_PATH, BusSession, BusRequest, encode_request, decode_response, BusResponse};
 use anyhow::Result;
+use super::PREALLOCATE_CLIENT_BUFFER_BYTES;
 
 /// Convenient wrapper for accessing the bus
 /// 
@@ -17,7 +18,7 @@ pub async fn bus_request(requests: Vec<BusRequest>) -> Result<Vec<BusResponse>>
     };
     let msg = encode_request(&test)?;
     stream.write(&msg).await?;
-    let mut buf = Vec::new();
+    let mut buf = Vec::with_capacity(PREALLOCATE_CLIENT_BUFFER_BYTES);
     let _ = stream.read_to_end(&mut buf).await.unwrap();
     let reply = decode_response(&buf)?;
 

src/rust/lqos_bus/src/bus/mod.rs

@@ -20,7 +20,9 @@ pub const BUS_SOCKET_PATH: &str = "/run/lqos/bus";
 
 /// The directory containing the bus socket. Used for ensuring
 /// that the directory exists.
-pub(crate) const BUS_SOCKET_DIRECTORY: &str = "/run/lqos/.";
+pub(crate) const BUS_SOCKET_DIRECTORY: &str = "/run/lqos";
+
+const PREALLOCATE_CLIENT_BUFFER_BYTES: usize = 10240;
 
 /// Encodes a BusSession with `bincode`, providing a tight binary
 /// representation of the request object for TCP transmission.

src/rust/lqos_bus/src/bus/persistent_client.rs

@@ -9,6 +9,7 @@ use tokio::{
   net::UnixStream,
   time::timeout,
 };
+use super::PREALLOCATE_CLIENT_BUFFER_BYTES;
 
 /// Provides a lqosd bus client that persists between connections. Useful for when you are
 /// going to be repeatedly polling the bus for data (e.g. `lqtop`) and want to avoid the
@@ -25,7 +26,7 @@ impl BusClient {
   pub async fn new() -> Result<Self> {
     Ok(Self {
       stream: Self::connect().await,
-      buffer: vec![0u8; 10240],
+      buffer: vec![0u8; PREALLOCATE_CLIENT_BUFFER_BYTES],
       timeout: Duration::from_millis(100),
     })
   }

src/rust/lqos_bus/src/bus/unix_socket_server.rs

@@ -1,7 +1,6 @@
 use std::{fs::remove_file, ffi::CString};
 use crate::{BUS_SOCKET_PATH, decode_request, BusReply, encode_response, BusRequest, BusResponse};
 use anyhow::Result;
-use nix::libc::mode_t;
 use tokio::{net::{UnixListener, UnixStream}, io::{AsyncReadExt, AsyncWriteExt}};
 use log::warn;
 
@@ -15,8 +14,9 @@ impl UnixSocketServer {
     /// Creates a new `UnixSocketServer`. Will delete any pre-existing
     /// socket file.
     pub fn new() -> Result<Self> {
-        Self::check_directory()?;
         Self::delete_local_socket()?;
+        Self::check_directory()?;
+        Self::path_permissions()?;
         Ok(Self {})
     }
 
@@ -33,14 +33,18 @@ impl UnixSocketServer {
             Ok(())
         } else {
             std::fs::create_dir(dir_path)?;            
-            let unix_path = CString::new(BUS_SOCKET_DIRECTORY)?;
-            unsafe {
-                nix::libc::chmod(unix_path.as_ptr(), mode_t::from_le(666));
-            }
             Ok(())
         }
     }
 
+    fn path_permissions() -> Result<()> {
+        let unix_path = CString::new(BUS_SOCKET_DIRECTORY)?;
+        unsafe {
+            nix::libc::chmod(unix_path.as_ptr(), 777);
+        }
+        Ok(())
+    }
+
     fn delete_local_socket() -> Result<()> {
         let socket_path = std::path::Path::new(BUS_SOCKET_PATH);
         if socket_path.exists() {
@@ -50,10 +54,7 @@ impl UnixSocketServer {
     }
 
     fn make_socket_public() -> Result<()> {
-        let unix_path = CString::new(BUS_SOCKET_PATH)?;
-        unsafe {
-            nix::libc::chmod(unix_path.as_ptr(), mode_t::from_le(666));
-        }
+        lqos_utils::run_success!("/bin/chmod", "-R", "a+rwx", BUS_SOCKET_DIRECTORY);
         Ok(())
     }
 
@@ -78,7 +79,7 @@ impl UnixSocketServer {
 
                     if let Ok(request) = decode_request(&buf) {
                         let mut response = BusReply {
-                            responses: Vec::new(),
+                            responses: Vec::with_capacity(8),
                         };
                         handle_bus_requests(&request.requests, &mut response.responses);
                         let _ = reply_unix(&encode_response(&response).unwrap(), &mut socket).await;

src/rust/lqos_config/src/lib.rs

@@ -17,3 +17,6 @@ pub use etc::{BridgeConfig, BridgeInterface, BridgeVlan, EtcLqos, Tunables};
 pub use libre_qos_config::LibreQoSConfig;
 pub use program_control::load_libreqos;
 pub use shaped_devices::{ConfigShapedDevices, ShapedDevice};
+
+/// Used as a constant in determining buffer preallocation
+pub const SUPPORTED_CUSTOMERS: usize = 16_000_000;

src/rust/lqos_config/src/shaped_devices/mod.rs

@@ -1,6 +1,6 @@
 mod serializable;
 mod shaped_device;
-use crate::etc;
+use crate::{etc, SUPPORTED_CUSTOMERS};
 use anyhow::Result;
 use csv::{QuoteStyle, WriterBuilder, ReaderBuilder};
 use serializable::SerializableShapedDevice;
@@ -38,7 +38,7 @@ impl ConfigShapedDevices {
 
         // Example: StringRecord(["1", "968 Circle St., Gurnee, IL 60031", "1", "Device 1", "", "", "192.168.101.2", "", "25", "5", "10000", "10000", ""])
         
-        let mut devices = Vec::new();
+        let mut devices = Vec::with_capacity(SUPPORTED_CUSTOMERS);
         for result in reader.records() {
             if let Ok(result) = result {
                 if let Ok(device) = ShapedDevice::from_csv(&result) {

src/rust/lqos_node_manager/src/tracker/cache/cpu_ram.rs

@@ -3,7 +3,7 @@ use parking_lot::RwLock;
 
 lazy_static! {
     /// Global storage of current CPU usage
-    pub static ref CPU_USAGE : RwLock<Vec<f32>> = RwLock::new(Vec::new());
+    pub static ref CPU_USAGE : RwLock<Vec<f32>> = RwLock::new(Vec::with_capacity(128));
 }
 
 lazy_static! {

src/rust/lqos_node_manager/src/tracker/cache/lqosd_stats.rs

@@ -3,15 +3,15 @@ use lqos_bus::IpStats;
 use parking_lot::RwLock;
 
 lazy_static! {
-    pub static ref TOP_10_DOWNLOADERS: RwLock<Vec<IpStats>> = RwLock::new(Vec::new());
+    pub static ref TOP_10_DOWNLOADERS: RwLock<Vec<IpStats>> = RwLock::new(Vec::with_capacity(10));
 }
 
 lazy_static! {
-    pub static ref WORST_10_RTT: RwLock<Vec<IpStats>> = RwLock::new(Vec::new());
+    pub static ref WORST_10_RTT: RwLock<Vec<IpStats>> = RwLock::new(Vec::with_capacity(10));
 }
 
 lazy_static! {
-    pub static ref RTT_HISTOGRAM: RwLock<Vec<u32>> = RwLock::new(Vec::new());
+    pub static ref RTT_HISTOGRAM: RwLock<Vec<u32>> = RwLock::new(Vec::with_capacity(100));
 }
 
 lazy_static! {

src/rust/lqos_python/src/blocking.rs

@@ -4,7 +4,7 @@ use lqos_bus::{
 };
 
 pub fn run_query(requests: Vec<BusRequest>) -> Result<Vec<BusResponse>> {
-    let mut replies = Vec::new();
+    let mut replies = Vec::with_capacity(8);
     tokio::runtime::Builder::new_current_thread()
         .enable_all()
         .build()

src/rust/lqosd/src/file_lock.rs

@@ -5,7 +5,7 @@ use sysinfo::{System, SystemExt, Pid, ProcessExt};
 
 const LOCK_PATH: &str = "/run/lqos/lqosd.lock";
 const LOCK_DIR: &str = "/run/lqos";
-const LOCK_DIR_PERMS: &str = "/run/lqos/.";
+const LOCK_DIR_PERMS: &str = "/run/lqos";
 
 pub struct FileLock {}
 
@@ -46,8 +46,14 @@ impl FileLock {
     fn create_lock() -> Result<()> {
         let pid = unsafe { getpid() };
         let pid_format = format!("{pid}");
+        {
             let mut f = File::create(LOCK_PATH)?;
             f.write_all(pid_format.as_bytes())?;
+        }
+        let unix_path = CString::new(LOCK_PATH)?;
+        unsafe {
+            nix::libc::chmod(unix_path.as_ptr(), mode_t::from_le(666));
+        }
         Ok(())
     }
 
@@ -59,7 +65,7 @@ impl FileLock {
             std::fs::create_dir(dir_path)?;
             let unix_path = CString::new(LOCK_DIR_PERMS)?;
             unsafe {
-                nix::libc::chmod(unix_path.as_ptr(), mode_t::from_le(666));
+                nix::libc::chmod(unix_path.as_ptr(), 777);
             }
             Ok(())
         }