netdev - Re: [PATCH net-next 0/4] tcp: tsq: performance series

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Message-ID: <CANn89iK1FJ9mMYE+fQYrtDTJ4ohsuMSv+P9sJPnSWq9RqdQ3gA@mail.gmail.com>
Date:   Fri, 2 Dec 2016 12:57:06 -0800
From:   Eric Dumazet <edumazet@...gle.com>
To:     "David S . Miller" <davem@...emloft.net>
Cc:     netdev <netdev@...r.kernel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        Eric Dumazet <eric.dumazet@...il.com>
Subject: Re: [PATCH net-next 0/4] tcp: tsq: performance series

On Fri, Dec 2, 2016 at 10:25 AM, Eric Dumazet <edumazet@...gle.com> wrote:
> Under very high TX stress, CPU handling NIC TX completions can spend
> considerable amount of cycles handling TSQ (TCP Small Queues) logic.
>
> This patch series avoids some atomic operations, but more important
> patch is the 3rd one, allowing other cpus processing ACK packets and
> calling tcp_write_xmit() to grab TCP_TSQ_DEFERRED so that
> tcp_tasklet_func() can skip already processed sockets.
>
> This avoid lots of lock acquisitions and cache lines accesses,
> particularly under load.
>

Please do not merge this version.

I probably messed something, I need to make more tests.

Thanks.