diff --git a/artiq/runtime.rs/src/lib.rs b/artiq/runtime.rs/src/lib.rs
index 48efd5d0d..b3350dfc8 100644
--- a/artiq/runtime.rs/src/lib.rs
+++ b/artiq/runtime.rs/src/lib.rs
@@ -97,7 +97,7 @@ pub extern "C" fn _Unwind_Resume() -> ! {
 
 #[no_mangle]
 pub unsafe extern fn rust_main() {
-    static mut LOG_BUFFER: [u8; 4096] = [0; 4096];
+    static mut LOG_BUFFER: [u8; 65536] = [0; 65536];
     BufferLogger::new(&mut LOG_BUFFER[..])
                  .register(move || {
         info!("booting ARTIQ...");
diff --git a/artiq/runtime.rs/src/logger.rs b/artiq/runtime.rs/src/logger.rs
index e01248da2..77d1d01d5 100644
--- a/artiq/runtime.rs/src/logger.rs
+++ b/artiq/runtime.rs/src/logger.rs
@@ -1,6 +1,6 @@
 use core::{mem, ptr};
 use core::cell::RefCell;
-use log::{self, Log, LogMetadata, LogRecord, LogLevelFilter};
+use log::{self, Log, LogLevel, LogMetadata, LogRecord, LogLevelFilter};
 use log_buffer::LogBuffer;
 use clock;
 
@@ -61,8 +61,10 @@ impl Log for BufferLogger {
             writeln!(self.buffer.borrow_mut(),
                      "[{:12}us] {:>5}({}): {}",
                      clock::get_us(), record.level(), record.target(), record.args()).unwrap();
-            println!("[{:12}us] {:>5}({}): {}",
-                     clock::get_us(), record.level(), record.target(), record.args());
+            if record.level() <= LogLevel::Info {
+                println!("[{:12}us] {:>5}({}): {}",
+                         clock::get_us(), record.level(), record.target(), record.args());
+            }
         }
     }
 }