netdev - Re: [PATCH v1 net-next 0/5] net: optimize TX throughput and efficiency

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Message-ID: <87frbm6aa1.fsf@toke.dk>
Date: Mon, 13 Oct 2025 18:23:18 +0200
From: Toke Høiland-Jørgensen <toke@...hat.com>
To: Eric Dumazet <edumazet@...gle.com>, "David S . Miller"
 <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>, Paolo Abeni
 <pabeni@...hat.com>
Cc: Simon Horman <horms@...nel.org>, Jamal Hadi Salim <jhs@...atatu.com>,
 Cong Wang <xiyou.wangcong@...il.com>, Jiri Pirko <jiri@...nulli.us>,
 Kuniyuki Iwashima <kuniyu@...gle.com>, Willem de Bruijn
 <willemb@...gle.com>, netdev@...r.kernel.org, eric.dumazet@...il.com, Eric
 Dumazet <edumazet@...gle.com>
Subject: Re: [PATCH v1 net-next 0/5] net: optimize TX throughput and efficiency

Eric Dumazet <edumazet@...gle.com> writes:

> In this series, I replace the busylock spinlock we have in
> __dev_queue_xmit() and use lockless list (llist) to reduce
> spinlock contention to the minimum.
>
> Idea is that only one cpu might spin on the qdisc spinlock,
> while others simply add their skb in the llist.
>
> After this series, we get a 300 % (4x) improvement on heavy TX workloads,
> sending twice the number of packets per second, for half the cpu
> cycles.

Figured I might as well take a closer look at the rest of the series. So
for the whole thing:

Reviewed-by: Toke Høiland-Jørgensen <toke@...hat.com>