From: Han Han <hhan@redhat.com>
Date: Wed, 11 May 2022 02:17:04 +0000 (+0800)
Subject: news: qemu: Set noqueue qdisc for TAP devices
X-Git-Tag: v8.4.0-rc1~107
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=49211723b69860b508827f4171de3bb1bb24a042;p=thirdparty%2Flibvirt.git

news: qemu: Set noqueue qdisc for TAP devices

Signed-off-by: Han Han <hhan@redhat.com>
Reviewed-by: Andrea Bolognani <abologna@redhat.com>
---

diff --git a/NEWS.rst b/NEWS.rst
index 4fbf911298..92c3a25184 100644
--- a/NEWS.rst
+++ b/NEWS.rst
@@ -1220,6 +1220,12 @@ v6.9.0 (2020-11-02)
 
     Set ``max_len=0`` in ``virtlogd.conf`` to disable log rollover.
 
+  * qemu: Set noqueue qdisc for TAP devices
+
+    Set ``noqueue`` instead of the former ``pfifo_fast`` queue discipline
+    for TAP devices. It will avoid needless cost of host CPU cycles and
+    thus improve performance.
+
 * **Bug fixes**
 
   * hyperv: ensure WQL queries work in all locales