From 0d926fb3f7271feac185dfecf846fe341cc26b4c Mon Sep 17 00:00:00 2001
From: bjorn3 <17426603+bjorn3@users.noreply.github.com>
Date: Sun, 16 Jun 2024 12:04:05 +0200
Subject: [PATCH] xhcid: Sleep for 2ms on every poll loop

This significantly reduces cpu usage. On my laptop before this change a
single core would be fully loaded while running at 3-4GHz. With this
change it would only be loaded for about 50% while running at 1-2GHz.
This improves battery lifetime while also preventing the fan from
spinning up to a distracting level.

This shouldn't noticably affect latency given that most keyboards and
mice don't support polling at 500Hz anyway.
---
 xhcid/src/xhci/irq_reactor.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/xhcid/src/xhci/irq_reactor.rs b/xhcid/src/xhci/irq_reactor.rs
index 45d22a0eb7..f496280ed7 100644
--- a/xhcid/src/xhci/irq_reactor.rs
+++ b/xhcid/src/xhci/irq_reactor.rs
@@ -105,7 +105,7 @@ impl IrqReactor {
     }
     // TODO: Configure the amount of time wait when no more work can be done (for IRQ-less polling).
     fn pause(&self) {
-        std::thread::yield_now();
+        std::thread::sleep(std::time::Duration::from_millis(2));
     }
     fn run_polling(mut self) {
         debug!("Running IRQ reactor in polling mode.");