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From: Alexei Starovoitov <alexei.starovoitov@gmail.com>
To: Sridhar Samudrala <sridhar.samudrala@intel.com>
Cc: "Karlsson, Magnus" <magnus.karlsson@intel.com>,
	"Björn Töpel" <bjorn.topel@intel.com>,
	"Network Development" <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 18:20:15 -0700	[thread overview]
Message-ID: <CAADnVQ+XxmvY0cs8MYriMMd7=2TSEm4zCtB+fs2vkwdUY6UgAQ@mail.gmail.com> (raw)
In-Reply-To: <1570515415-45593-3-git-send-email-sridhar.samudrala@intel.com>

On Mon, Oct 7, 2019 at 11:18 PM Sridhar Samudrala
<sridhar.samudrala@intel.com> wrote:
> +
> +u32 bpf_direct_xsk(const struct bpf_prog *prog, struct xdp_buff *xdp)
> +{
> +       struct xdp_sock *xsk;
> +
> +       xsk = xdp_get_xsk_from_qid(xdp->rxq->dev, xdp->rxq->queue_index);
> +       if (xsk) {
> +               struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info);
> +
> +               ri->xsk = xsk;
> +               return XDP_REDIRECT;
> +       }
> +
> +       return XDP_PASS;
> +}
> +EXPORT_SYMBOL(bpf_direct_xsk);

So you're saying there is a:
"""
xdpsock rxdrop 1 core (both app and queue's irq pinned to the same core)
   default : taskset -c 1 ./xdpsock -i enp66s0f0 -r -q 1
   direct-xsk :taskset -c 1 ./xdpsock -i enp66s0f0 -r -q 1
6.1x improvement in drop rate
"""

6.1x gain running above C code vs exactly equivalent BPF code?
How is that possible?

  parent reply	other threads:[~2019-10-09  1:20 UTC|newest]

Thread overview: 42+ 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 ` [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 ` [PATCH bpf-next 2/4] xsk: allow AF_XDP sockets to receive packets directly from a queue Sridhar Samudrala
2019-10-08  6:58   ` Toke Høiland-Jørgensen
2019-10-08  8:47     ` Björn Töpel
2019-10-08  8:48       ` Björn Töpel
2019-10-08  9:04       ` Toke Høiland-Jørgensen
2019-10-08  8:05   ` Björn Töpel
2019-10-09 16:32     ` Samudrala, Sridhar
2019-10-09  1:20   ` Alexei Starovoitov [this message]
     [not found]     ` <3ED8E928C4210A4289A677D2FEB48235140134CE@fmsmsx111.amr.corp.intel.com>
2019-10-09 16:53       ` FW: " Samudrala, Sridhar
2019-10-09 17:17         ` Alexei Starovoitov
2019-10-09 19:12           ` Samudrala, Sridhar
2019-10-10  1:06             ` Alexei Starovoitov
2019-10-18 18:40               ` Samudrala, Sridhar
2019-10-18 19:22                 ` Toke Høiland-Jørgensen
2019-10-19  0:14                 ` Alexei Starovoitov
2019-10-19  0:45                   ` Samudrala, Sridhar
2019-10-19  2:25                     ` Alexei Starovoitov
2019-10-20 10:14                       ` Toke Høiland-Jørgensen
2019-10-20 17:12                         ` [Intel-wired-lan] " Björn Töpel
2019-10-21 20:10                           ` Samudrala, Sridhar
2019-10-21 22:34                             ` Alexei Starovoitov
2019-10-22 19:06                               ` Samudrala, Sridhar
2019-10-23 17:42                                 ` Alexei Starovoitov
2019-10-24 18:12                                   ` Samudrala, Sridhar
2019-10-25  7:42                                     ` Björn Töpel
2019-10-31 22:38                                       ` Samudrala, Sridhar
2019-10-31 23:15                                         ` Alexei Starovoitov
2019-11-01  0:21                                         ` Jakub Kicinski
2019-11-01 18:31                                           ` Samudrala, Sridhar
2019-11-04  2:08                                           ` dan
2019-10-25  9:07                                   ` Björn Töpel
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  8:05   ` Björn Töpel
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  8:05   ` Björn Töpel
2019-10-08  8:05 ` [PATCH bpf-next 0/4] Enable direct receive on AF_XDP sockets Björn Töpel
2019-10-09 16:19   ` Samudrala, Sridhar
2019-10-09  0:49 ` Jakub Kicinski
2019-10-09  6:29   ` Samudrala, Sridhar
2019-10-09 16:53     ` Jakub Kicinski

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