From 5687c190d8b895ba541928b031aad42bed4c21c3 Mon Sep 17 00:00:00 2001
From: Jerry Zhao <ch3nzhao@gmail.com>
Date: Tue, 13 Oct 2026 07:00:04 +0000
Subject: [PATCH] fix(dpdk): mark RX notification drain result as intentionally
 unused

---
 src/io/dpdk_backend.cpp | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/io/dpdk_backend.cpp b/src/io/dpdk_backend.cpp
index 75c7f31..554a9ea 100644
--- a/src/io/dpdk_backend.cpp
+++ b/src/io/dpdk_backend.cpp
@@ -261,8 +261,12 @@ class DpdkBackend::Impl {
       // records must be consumed by the PMD's interrupt-disable callback.
       // Only ordinary hardware eventfds accept a uint64_t acknowledgement.
       if (!fabric.tap && !fabric.mlx5) {
+        // Output-only counter: read writes it, and RX queues supply packet
+        // readiness independently of its value. No initialization is needed.
         std::uint64_t value;
-        (void)::read(fd, &value, sizeof(value));
+        // Best-effort drain; an unacknowledged counter causes another wake.
+        [[maybe_unused]] const auto acknowledged =
+            ::read(fd, &value, sizeof(value));
       }
     }
   } notification;