From: Martin KaFai Lau <kafai@fb.com>
To: David Ahern <dsahern@gmail.com>
Cc: Pavel Begunkov <asml.silence@gmail.com>,
<io-uring@vger.kernel.org>, <netdev@vger.kernel.org>,
<linux-kernel@vger.kernel.org>, Jakub Kicinski <kuba@kernel.org>,
Jonathan Lemon <jonathan.lemon@gmail.com>,
"David S . Miller" <davem@davemloft.net>,
Willem de Bruijn <willemb@google.com>,
Eric Dumazet <edumazet@google.com>,
Hideaki YOSHIFUJI <yoshfuji@linux-ipv6.org>,
David Ahern <dsahern@kernel.org>, Jens Axboe <axboe@kernel.dk>
Subject: Re: [RFC 00/12] io_uring zerocopy send
Date: Wed, 1 Dec 2021 15:07:57 -0800 [thread overview]
Message-ID: <20211201230757.fuhnhgtbx5o22wgs@kafai-mbp.dhcp.thefacebook.com> (raw)
In-Reply-To: <66dc5bcb-633d-efe8-0ccc-dcb97d08769c@gmail.com>
On Wed, Dec 01, 2021 at 03:35:49PM -0700, David Ahern wrote:
> On 12/1/21 2:51 PM, Martin KaFai Lau wrote:
> >
> > To tx out dummy, I did:
> > #> ip a add 10.0.0.1/24 dev dummy0
> ^^^^^^^^
> >
> > #> ip -4 r
> > 10.0.0.0/24 dev dummy0 proto kernel scope link src 10.0.0.1
> >
> > #> ./send-zc -4 -D 10.0.0.(2) -t 10 udp
> ^^^^^^^^^^
>
> Pavel's commands have: 'send-zc -4 -D <dummy_ip_addr> -t 10 udp'
>
> I read dummy_ip_addr as the address assigned to dummy0; that's an
> important detail. You are sending to an address on that network, not the
> address assigned to the device, in which case packets are created and
> then dropped by the dummy driver - nothing actually makes it to the server.
Right, I assumed "dropped by dummy driver" is the usual intention
for using dummy, so just in case if it was the intention for
testing tx only. You are right and it seems the intention
of this command is to have server receiving the packets.
>
>
> > ip -s link show dev dummy0
> > 2: dummy0: <BROADCAST,NOARP,UP,LOWER_UP> mtu 65535 qdisc noqueue state UNKNOWN mode DEFAULT group default qlen 1000
> > link/ether 82:0f:e0:dc:f7:e6 brd ff:ff:ff:ff:ff:ff
> > RX: bytes packets errors dropped missed mcast
> > 0 0 0 0 0 0
> > TX: bytes packets errors dropped carrier collsns
> > 140800890299 2150397 0 0 0 0
> >
>
next prev parent reply other threads:[~2021-12-01 23:08 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-11-30 15:18 [RFC 00/12] io_uring zerocopy send Pavel Begunkov
2021-11-30 15:18 ` [RFC 01/12] skbuff: add SKBFL_DONT_ORPHAN flag Pavel Begunkov
2021-11-30 15:18 ` [RFC 02/12] skbuff: pass a struct ubuf_info in msghdr Pavel Begunkov
2021-11-30 15:18 ` [RFC 03/12] net/udp: add support msgdr::msg_ubuf Pavel Begunkov
2021-11-30 15:18 ` [RFC 04/12] net: add zerocopy_sg_from_iter for bvec Pavel Begunkov
2021-11-30 15:18 ` [RFC 05/12] net: optimise page get/free for bvec zc Pavel Begunkov
2021-12-01 19:20 ` Jonathan Lemon
2021-12-01 20:17 ` Pavel Begunkov
2021-11-30 15:18 ` [RFC 06/12] io_uring: add send notifiers registration Pavel Begunkov
2021-11-30 15:18 ` [RFC 07/12] io_uring: infrastructure for send zc notifications Pavel Begunkov
2021-11-30 15:18 ` [RFC 08/12] io_uring: wire send zc request type Pavel Begunkov
2021-11-30 15:18 ` [RFC 09/12] io_uring: add an option to flush zc notifications Pavel Begunkov
2021-11-30 15:18 ` [RFC 10/12] io_uring: opcode independent fixed buf import Pavel Begunkov
2021-11-30 15:18 ` [RFC 11/12] io_uring: sendzc with fixed buffers Pavel Begunkov
2021-11-30 15:19 ` [RFC 12/12] io_uring: cache struct ubuf_info Pavel Begunkov
2021-12-01 3:10 ` [RFC 00/12] io_uring zerocopy send David Ahern
2021-12-01 15:32 ` Pavel Begunkov
2021-12-01 17:57 ` David Ahern
2021-12-01 19:11 ` Pavel Begunkov
2021-12-01 19:20 ` David Ahern
2021-12-01 20:15 ` Pavel Begunkov
2021-12-01 21:51 ` Martin KaFai Lau
2021-12-01 22:35 ` David Ahern
2021-12-01 23:07 ` Martin KaFai Lau [this message]
2021-12-01 23:18 ` Pavel Begunkov
2021-12-02 15:48 ` Pavel Begunkov
2021-12-02 17:40 ` Martin KaFai Lau
2021-12-01 20:42 ` Pavel Begunkov
2021-12-01 14:31 ` Pavel Begunkov
2021-12-01 17:49 ` David Ahern
2021-12-01 19:59 ` Pavel Begunkov
2021-12-01 18:10 ` Willem de Bruijn
2021-12-01 19:59 ` Pavel Begunkov
2021-12-01 20:29 ` Pavel Begunkov
2021-12-02 0:36 ` Willem de Bruijn
2021-12-02 16:25 ` Pavel Begunkov
2021-12-02 0:32 ` Willem de Bruijn
2021-12-02 16:45 ` Pavel Begunkov
2021-12-02 21:25 ` Willem de Bruijn
2021-12-03 16:19 ` Pavel Begunkov
2021-12-03 16:30 ` Willem de Bruijn
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