diff --git a/src/diskio/mod.rs b/src/diskio/mod.rs
index ebcc54a847..3a9369e836 100644
--- a/src/diskio/mod.rs
+++ b/src/diskio/mod.rs
@@ -65,7 +65,7 @@ use std::{
 };
 
 use anyhow::anyhow;
-use tracing::{error, trace, warn};
+use tracing::{debug, error, trace, warn};
 
 use crate::{
     diskio::immediate::{FileState, IncrementalFileWriter},
@@ -474,12 +474,10 @@ pub(super) fn get_executor<'a>(
 fn effective_thread_count(ram_budget: usize, thread_count: IoThreadCount) -> usize {
     match thread_count {
         IoThreadCount::Default(n) if n > 1 && ram_budget < LOW_MEMORY_THRESHOLD => {
-            warn!(
-                "using single-threaded unpacking due to low memory \
-                 (ram budget: {} < {} threshold), \
-                 set RUSTUP_IO_THREADS to override",
+            debug!(
+                "using single-threaded unpacking due to low memory (ram budget: {} < {} threshold), set RUSTUP_IO_THREADS to override",
                 Size::new(ram_budget),
-                Size::new(LOW_MEMORY_THRESHOLD)
+                Size::new(LOW_MEMORY_THRESHOLD),
             );
             1
         }
diff --git a/src/diskio/test.rs b/src/diskio/test.rs
index 6f876d7d14..360cd6eb7a 100644
--- a/src/diskio/test.rs
+++ b/src/diskio/test.rs
@@ -1,6 +1,6 @@
 use std::collections::HashMap;
 
-use super::{Executor, Item, Kind, get_executor};
+use super::{Item, Kind, get_executor};
 use crate::{process::TestProcess, test::test_dir};
 
 impl Item {
@@ -21,8 +21,7 @@ fn test_incremental_file(io_threads: &str) -> anyhow::Result<()> {
 
     let mut written = 0;
     let mut file_finished = false;
-    let mut io_executor: Box<dyn Executor> =
-        get_executor(32 * 1024 * 1024, tp.process.io_thread_count()?);
+    let mut io_executor = get_executor(32 * 1024 * 1024, tp.process.io_thread_count()?);
     let (item, mut sender) = Item::write_file_segmented(
         work_dir.path().join("scratch"),
         0o666,
@@ -88,8 +87,7 @@ fn test_complete_file(io_threads: &str) -> anyhow::Result<()> {
     vars.insert("RUSTUP_IO_THREADS".to_string(), io_threads.to_string());
     let tp = TestProcess::with_vars(vars);
 
-    let mut io_executor: Box<dyn Executor> =
-        get_executor(32 * 1024 * 1024, tp.process.io_thread_count()?);
+    let mut io_executor = get_executor(32 * 1024 * 1024, tp.process.io_thread_count()?);
     let mut chunk = io_executor.get_buffer(10);
     chunk.extend(b"0123456789");
     assert_eq!(chunk.len(), 10);