From: "Toke Høiland-Jørgensen" <toke@redhat.com>
To: Toshiaki Makita <makita.toshiaki@lab.ntt.co.jp>,
Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
"David S. Miller" <davem@davemloft.net>,
Jakub Kicinski <jakub.kicinski@netronome.com>,
Jesper Dangaard Brouer <hawk@kernel.org>,
John Fastabend <john.fastabend@gmail.com>
Cc: Toshiaki Makita <makita.toshiaki@lab.ntt.co.jp>,
netdev@vger.kernel.org, xdp-newbies@vger.kernel.org,
bpf@vger.kernel.org
Subject: Re: [PATCH bpf-next 1/3] xdp: Add bulk XDP_TX queue
Date: Thu, 23 May 2019 13:11:20 +0200 [thread overview]
Message-ID: <8736l52zon.fsf@toke.dk> (raw)
In-Reply-To: <1558609008-2590-2-git-send-email-makita.toshiaki@lab.ntt.co.jp>
Toshiaki Makita <makita.toshiaki@lab.ntt.co.jp> writes:
> XDP_TX is similar to XDP_REDIRECT as it essentially redirects packets to
> the device itself. XDP_REDIRECT has bulk transmit mechanism to avoid the
> heavy cost of indirect call but it also reduces lock acquisition on the
> destination device that needs locks like veth and tun.
>
> XDP_TX does not use indirect calls but drivers which require locks can
> benefit from the bulk transmit for XDP_TX as well.
XDP_TX happens on the same device, so there's an implicit bulking
happening because of the NAPI cycle. So why is an additional mechanism
needed (in the general case)?
-Toke
WARNING: multiple messages have this Message-ID (diff)
From: "Toke Høiland-Jørgensen" <toke@redhat.com>
To: Toshiaki Makita <makita.toshiaki@lab.ntt.co.jp>,
Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
"David S. Miller" <davem@davemloft.net>,
Jakub Kicinski <jakub.kicinski@netronome.com>,
Jesper Dangaard Brouer <hawk@kernel.org>,
John Fastabend <john.fastabend@gmail.com>
Cc: netdev@vger.kernel.org, xdp-newbies@vger.kernel.org, bpf@vger.kernel.org
Subject: Re: [PATCH bpf-next 1/3] xdp: Add bulk XDP_TX queue
Date: Thu, 23 May 2019 13:11:20 +0200 [thread overview]
Message-ID: <8736l52zon.fsf@toke.dk> (raw)
In-Reply-To: <1558609008-2590-2-git-send-email-makita.toshiaki@lab.ntt.co.jp>
Toshiaki Makita <makita.toshiaki@lab.ntt.co.jp> writes:
> XDP_TX is similar to XDP_REDIRECT as it essentially redirects packets to
> the device itself. XDP_REDIRECT has bulk transmit mechanism to avoid the
> heavy cost of indirect call but it also reduces lock acquisition on the
> destination device that needs locks like veth and tun.
>
> XDP_TX does not use indirect calls but drivers which require locks can
> benefit from the bulk transmit for XDP_TX as well.
XDP_TX happens on the same device, so there's an implicit bulking
happening because of the NAPI cycle. So why is an additional mechanism
needed (in the general case)?
-Toke
next prev parent reply other threads:[~2019-05-23 11:11 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-05-23 10:56 [PATCH bpf-next 0/3] veth: Bulk XDP_TX Toshiaki Makita
2019-05-23 10:56 ` [PATCH bpf-next 1/3] xdp: Add bulk XDP_TX queue Toshiaki Makita
2019-05-23 11:11 ` Toke Høiland-Jørgensen [this message]
2019-05-23 11:11 ` Toke Høiland-Jørgensen
2019-05-23 11:24 ` Toshiaki Makita
2019-05-23 11:33 ` Toke Høiland-Jørgensen
2019-05-23 10:56 ` [PATCH bpf-next 2/3] xdp: Add tracepoint for bulk XDP_TX Toshiaki Makita
2019-05-23 13:12 ` Jesper Dangaard Brouer
2019-05-24 1:33 ` Toshiaki Makita
2019-05-23 10:56 ` [PATCH bpf-next 3/3] veth: Support " Toshiaki Makita
2019-05-23 11:25 ` Toke Høiland-Jørgensen
2019-05-23 11:25 ` Toke Høiland-Jørgensen
2019-05-23 11:35 ` Toshiaki Makita
2019-05-23 12:18 ` Toke Høiland-Jørgensen
2019-05-23 13:40 ` Toshiaki Makita
2019-05-23 13:29 ` Jesper Dangaard Brouer
2019-05-23 13:51 ` Toshiaki Makita
2019-05-24 3:13 ` Jason Wang
2019-05-24 3:28 ` Toshiaki Makita
2019-05-24 3:54 ` Jason Wang
2019-05-24 4:52 ` Toshiaki Makita
2019-05-24 9:53 ` Jesper Dangaard Brouer
2019-05-27 6:08 ` Toshiaki Makita
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