diff options
author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 10:06:00 +0000 |
---|---|---|
committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 10:06:00 +0000 |
commit | b15a952c52a6825376d3e7f6c1bf5c886c6d8b74 (patch) | |
tree | 1500f2f8f276908a36d8126cb632c0d6b1276764 /debian/patches-rt/0238-net-dev-always-take-qdisc-s-busylock-in-__dev_xmit_s.patch | |
parent | Adding upstream version 5.10.209. (diff) | |
download | linux-b15a952c52a6825376d3e7f6c1bf5c886c6d8b74.tar.xz linux-b15a952c52a6825376d3e7f6c1bf5c886c6d8b74.zip |
Adding debian version 5.10.209-2.debian/5.10.209-2debian
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'debian/patches-rt/0238-net-dev-always-take-qdisc-s-busylock-in-__dev_xmit_s.patch')
-rw-r--r-- | debian/patches-rt/0238-net-dev-always-take-qdisc-s-busylock-in-__dev_xmit_s.patch | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/debian/patches-rt/0238-net-dev-always-take-qdisc-s-busylock-in-__dev_xmit_s.patch b/debian/patches-rt/0238-net-dev-always-take-qdisc-s-busylock-in-__dev_xmit_s.patch new file mode 100644 index 000000000..fe05e1e78 --- /dev/null +++ b/debian/patches-rt/0238-net-dev-always-take-qdisc-s-busylock-in-__dev_xmit_s.patch @@ -0,0 +1,42 @@ +From 3a7ff2036ac29effdf8fc39fc7ea9610f98ca5e4 Mon Sep 17 00:00:00 2001 +From: Sebastian Andrzej Siewior <bigeasy@linutronix.de> +Date: Wed, 30 Mar 2016 13:36:29 +0200 +Subject: [PATCH 238/323] net: dev: always take qdisc's busylock in + __dev_xmit_skb() +Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/5.10/older/patches-5.10.204-rt100.tar.xz + +The root-lock is dropped before dev_hard_start_xmit() is invoked and after +setting the __QDISC___STATE_RUNNING bit. If this task is now pushed away +by a task with a higher priority then the task with the higher priority +won't be able to submit packets to the NIC directly instead they will be +enqueued into the Qdisc. The NIC will remain idle until the task(s) with +higher priority leave the CPU and the task with lower priority gets back +and finishes the job. + +If we take always the busylock we ensure that the RT task can boost the +low-prio task and submit the packet. + +Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> +--- + net/core/dev.c | 4 ++++ + 1 file changed, 4 insertions(+) + +diff --git a/net/core/dev.c b/net/core/dev.c +index c55993848233..c3b4e5e320ca 100644 +--- a/net/core/dev.c ++++ b/net/core/dev.c +@@ -3796,7 +3796,11 @@ static inline int __dev_xmit_skb(struct sk_buff *skb, struct Qdisc *q, + * This permits qdisc->running owner to get the lock more + * often and dequeue packets faster. + */ ++#ifdef CONFIG_PREEMPT_RT ++ contended = true; ++#else + contended = qdisc_is_running(q); ++#endif + if (unlikely(contended)) + spin_lock(&q->busylock); + +-- +2.43.0 + |