From: David Miller <davem@davemloft.net>
To: brouer@redhat.com
Cc: netdev@vger.kernel.org, john.fastabend@gmail.com
Subject: Re: [PATCH net-next 0/7] XDP redirect tracepoints
Date: Tue, 29 Aug 2017 10:51:43 -0700 (PDT) [thread overview]
Message-ID: <20170829.105143.829989946050016565.davem@davemloft.net> (raw)
In-Reply-To: <150401743083.16384.15778781741742858567.stgit@firesoul>
From: Jesper Dangaard Brouer <brouer@redhat.com>
Date: Tue, 29 Aug 2017 16:37:35 +0200
> I feel this is as far as I can take the tracepoint infrastructure to
> assist XDP monitoring.
>
> Tracepoints comes with a base overhead of 25 nanosec for an attached
> bpf_prog, and 48 nanosec for using a full perf record. This is
> problematic for the XDP use-case, but it is very convenient to use the
> existing perf infrastructure.
>
>>From a performance perspective, the real solution would be to attach
> another bpf_prog (that understand xdp_buff), but I'm not sure we want
> to introduce yet another bpf attach API for this.
>
> One thing left is to standardize the possible err return codes, to a
> limited set, to allow easier (and faster) mapping into a bpf map.
Series applied, thanks Jesper.
prev parent reply other threads:[~2017-08-29 17:51 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-08-29 14:37 [PATCH net-next 0/7] XDP redirect tracepoints Jesper Dangaard Brouer
2017-08-29 14:37 ` [PATCH net-next 1/7] xdp: remove redundant argument to trace_xdp_redirect Jesper Dangaard Brouer
2017-08-29 14:37 ` [PATCH net-next 2/7] xdp: tracepoint xdp_redirect also need a map argument Jesper Dangaard Brouer
2017-08-29 14:37 ` [PATCH net-next 3/7] xdp: make xdp tracepoints report bpf prog id instead of prog_tag Jesper Dangaard Brouer
2017-08-29 14:37 ` [PATCH net-next 4/7] xdp: separate xdp_redirect tracepoint in error case Jesper Dangaard Brouer
2017-08-29 17:02 ` Alexei Starovoitov
2017-08-29 14:38 ` [PATCH net-next 5/7] xdp: separate xdp_redirect tracepoint in map case Jesper Dangaard Brouer
2017-08-29 14:38 ` [PATCH net-next 6/7] samples/bpf: xdp_redirect load XDP dummy prog on TX device Jesper Dangaard Brouer
2017-08-31 10:08 ` Tariq Toukan
2017-08-31 10:15 ` Jesper Dangaard Brouer
2017-08-29 14:38 ` [PATCH net-next 7/7] samples/bpf: xdp_monitor tool based on tracepoints Jesper Dangaard Brouer
2017-08-29 17:05 ` Alexei Starovoitov
2017-08-29 17:24 ` Daniel Borkmann
2017-08-29 17:51 ` David Miller [this message]
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