netdev - Re: [PATCH bpf-next 2/4] xsk: allow AF_XDP sockets to receive packets directly from a queue

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Date:   Tue, 8 Oct 2019 10:48:12 +0200
From:   Björn Töpel <bjorn.topel@...il.com>
To:     Toke Høiland-Jørgensen <toke@...hat.com>
Cc:     Sridhar Samudrala <sridhar.samudrala@...el.com>,
        "Karlsson, Magnus" <magnus.karlsson@...el.com>,
        Björn Töpel <bjorn.topel@...el.com>,
        Netdev <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>,
        intel-wired-lan <intel-wired-lan@...ts.osuosl.org>,
        maciej.fijalkowski@...el.com, tom.herbert@...el.com
Subject: Re: [PATCH bpf-next 2/4] xsk: allow AF_XDP sockets to receive packets
 directly from a queue

On Tue, 8 Oct 2019 at 10:47, Björn Töpel <bjorn.topel@...il.com> wrote:
>
[...]
>
> The dependent-read-barrier in READ_ONCE? Another branch -- leave that
> to the branch-predictor already! ;-) No, you're right, performance
> impact here is interesting. I guess the same static_branch could be
> used here as well...
>

...and I think the READ_ONCE can be omitted.