From: "Björn Töpel" <bjorn.topel@gmail.com>
To: "Toke Høiland-Jørgensen" <toke@redhat.com>
Cc: "Sridhar Samudrala" <sridhar.samudrala@intel.com>,
"Karlsson, Magnus" <magnus.karlsson@intel.com>,
"Björn Töpel" <bjorn.topel@intel.com>,
Netdev <netdev@vger.kernel.org>, bpf <bpf@vger.kernel.org>,
intel-wired-lan <intel-wired-lan@lists.osuosl.org>,
maciej.fijalkowski@intel.com, tom.herbert@intel.com
Subject: Re: [PATCH bpf-next 2/4] xsk: allow AF_XDP sockets to receive packets directly from a queue
Date: Tue, 8 Oct 2019 10:48:12 +0200 [thread overview]
Message-ID: <CAJ+HfNgEC=3MOe4YK_NNzRu6g_srKjWOCaCt09cU51avhWJKMg@mail.gmail.com> (raw)
In-Reply-To: <CAJ+HfNhcvRP34L3px6ipAsCiZdvLXG02brecwB=T-sXMaT5yRw@mail.gmail.com>
On Tue, 8 Oct 2019 at 10:47, Björn Töpel <bjorn.topel@gmail.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.
WARNING: multiple messages have this Message-ID (diff)
From: =?unknown-8bit?q?Bj=C3=B6rn_T=C3=B6pel?= <bjorn.topel@gmail.com>
To: intel-wired-lan@osuosl.org
Subject: [Intel-wired-lan] [PATCH bpf-next 2/4] xsk: allow AF_XDP sockets to receive packets directly from a queue
Date: Tue, 8 Oct 2019 10:48:12 +0200 [thread overview]
Message-ID: <CAJ+HfNgEC=3MOe4YK_NNzRu6g_srKjWOCaCt09cU51avhWJKMg@mail.gmail.com> (raw)
In-Reply-To: <CAJ+HfNhcvRP34L3px6ipAsCiZdvLXG02brecwB=T-sXMaT5yRw@mail.gmail.com>
On Tue, 8 Oct 2019 at 10:47, Bj?rn T?pel <bjorn.topel@gmail.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.
next prev parent reply other threads:[~2019-10-08 8:48 UTC|newest]
Thread overview: 84+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-08 6:16 [PATCH bpf-next 0/4] Enable direct receive on AF_XDP sockets Sridhar Samudrala
2019-10-08 6:16 ` [Intel-wired-lan] " Sridhar Samudrala
2019-10-08 6:16 ` [PATCH bpf-next 1/4] bpf: introduce bpf_get_prog_id and bpf_set_prog_id helper functions Sridhar Samudrala
2019-10-08 6:16 ` [Intel-wired-lan] " Sridhar Samudrala
2019-10-08 6:16 ` [PATCH bpf-next 2/4] xsk: allow AF_XDP sockets to receive packets directly from a queue Sridhar Samudrala
2019-10-08 6:16 ` [Intel-wired-lan] " Sridhar Samudrala
2019-10-08 6:58 ` Toke Høiland-Jørgensen
2019-10-08 6:58 ` [Intel-wired-lan] " Toke =?unknown-8bit?q?H=C3=B8iland-J=C3=B8rgensen?=
2019-10-08 8:47 ` Björn Töpel
2019-10-08 8:47 ` [Intel-wired-lan] " =?unknown-8bit?q?Bj=C3=B6rn_T=C3=B6pel?=
2019-10-08 8:48 ` Björn Töpel [this message]
2019-10-08 8:48 ` =?unknown-8bit?q?Bj=C3=B6rn_T=C3=B6pel?=
2019-10-08 9:04 ` Toke Høiland-Jørgensen
2019-10-08 9:04 ` [Intel-wired-lan] " Toke =?unknown-8bit?q?H=C3=B8iland-J=C3=B8rgensen?=
2019-10-08 8:05 ` Björn Töpel
2019-10-08 8:05 ` [Intel-wired-lan] " =?unknown-8bit?q?Bj=C3=B6rn_T=C3=B6pel?=
2019-10-09 16:32 ` Samudrala, Sridhar
2019-10-09 16:32 ` [Intel-wired-lan] " Samudrala, Sridhar
2019-10-09 1:20 ` Alexei Starovoitov
2019-10-09 1:20 ` [Intel-wired-lan] " Alexei Starovoitov
[not found] ` <3ED8E928C4210A4289A677D2FEB48235140134CE@fmsmsx111.amr.corp.intel.com>
2019-10-09 16:53 ` FW: " Samudrala, Sridhar
2019-10-09 16:53 ` [Intel-wired-lan] " Samudrala, Sridhar
2019-10-09 17:17 ` Alexei Starovoitov
2019-10-09 17:17 ` [Intel-wired-lan] " Alexei Starovoitov
2019-10-09 19:12 ` Samudrala, Sridhar
2019-10-09 19:12 ` [Intel-wired-lan] " Samudrala, Sridhar
2019-10-10 1:06 ` Alexei Starovoitov
2019-10-10 1:06 ` [Intel-wired-lan] " Alexei Starovoitov
2019-10-18 18:40 ` Samudrala, Sridhar
2019-10-18 18:40 ` [Intel-wired-lan] " Samudrala, Sridhar
2019-10-18 19:22 ` Toke Høiland-Jørgensen
2019-10-18 19:22 ` [Intel-wired-lan] " Toke =?unknown-8bit?q?H=C3=B8iland-J=C3=B8rgensen?=
2019-10-19 0:14 ` Alexei Starovoitov
2019-10-19 0:14 ` [Intel-wired-lan] " Alexei Starovoitov
2019-10-19 0:45 ` Samudrala, Sridhar
2019-10-19 0:45 ` [Intel-wired-lan] " Samudrala, Sridhar
2019-10-19 2:25 ` Alexei Starovoitov
2019-10-19 2:25 ` [Intel-wired-lan] " Alexei Starovoitov
2019-10-20 10:14 ` Toke Høiland-Jørgensen
2019-10-20 10:14 ` [Intel-wired-lan] " Toke =?unknown-8bit?q?H=C3=B8iland-J=C3=B8rgensen?=
2019-10-20 17:12 ` Björn Töpel
2019-10-20 17:12 ` =?unknown-8bit?q?Bj=C3=B6rn_T=C3=B6pel?=
2019-10-21 20:10 ` Samudrala, Sridhar
2019-10-21 20:10 ` Samudrala, Sridhar
2019-10-21 22:34 ` Alexei Starovoitov
2019-10-21 22:34 ` Alexei Starovoitov
2019-10-22 19:06 ` Samudrala, Sridhar
2019-10-22 19:06 ` Samudrala, Sridhar
2019-10-23 17:42 ` Alexei Starovoitov
2019-10-23 17:42 ` Alexei Starovoitov
2019-10-24 18:12 ` Samudrala, Sridhar
2019-10-24 18:12 ` Samudrala, Sridhar
2019-10-25 7:42 ` Björn Töpel
2019-10-25 7:42 ` =?unknown-8bit?q?Bj=C3=B6rn_T=C3=B6pel?=
2019-10-31 22:38 ` Samudrala, Sridhar
2019-10-31 22:38 ` Samudrala, Sridhar
2019-10-31 23:15 ` Alexei Starovoitov
2019-10-31 23:15 ` Alexei Starovoitov
2019-11-01 0:21 ` Jakub Kicinski
2019-11-01 0:21 ` Jakub Kicinski
2019-11-01 18:31 ` Samudrala, Sridhar
2019-11-01 18:31 ` Samudrala, Sridhar
2019-11-04 2:08 ` dan
2019-11-04 2:08 ` dan
2019-10-25 9:07 ` Björn Töpel
2019-10-25 9:07 ` =?unknown-8bit?q?Bj=C3=B6rn_T=C3=B6pel?=
2019-10-08 6:16 ` [PATCH bpf-next 3/4] libbpf: handle AF_XDP sockets created with XDP_DIRECT bind flag Sridhar Samudrala
2019-10-08 6:16 ` [Intel-wired-lan] " Sridhar Samudrala
2019-10-08 8:05 ` Björn Töpel
2019-10-08 8:05 ` [Intel-wired-lan] " =?unknown-8bit?q?Bj=C3=B6rn_T=C3=B6pel?=
2019-10-08 6:16 ` [PATCH bpf-next 4/4] xdpsock: add an option to create AF_XDP sockets in XDP_DIRECT mode Sridhar Samudrala
2019-10-08 6:16 ` [Intel-wired-lan] " Sridhar Samudrala
2019-10-08 8:05 ` Björn Töpel
2019-10-08 8:05 ` [Intel-wired-lan] " =?unknown-8bit?q?Bj=C3=B6rn_T=C3=B6pel?=
2019-10-08 8:05 ` [PATCH bpf-next 0/4] Enable direct receive on AF_XDP sockets Björn Töpel
2019-10-08 8:05 ` [Intel-wired-lan] " =?unknown-8bit?q?Bj=C3=B6rn_T=C3=B6pel?=
2019-10-09 16:19 ` Samudrala, Sridhar
2019-10-09 16:19 ` [Intel-wired-lan] " Samudrala, Sridhar
2019-10-09 0:49 ` Jakub Kicinski
2019-10-09 0:49 ` [Intel-wired-lan] " Jakub Kicinski
2019-10-09 6:29 ` Samudrala, Sridhar
2019-10-09 6:29 ` [Intel-wired-lan] " Samudrala, Sridhar
2019-10-09 16:53 ` Jakub Kicinski
2019-10-09 16:53 ` [Intel-wired-lan] " Jakub Kicinski
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