From: Pavel Begunkov <[email protected]>
To: Martin KaFai Lau <[email protected]>, David Ahern <[email protected]>
Cc: [email protected], [email protected],
[email protected], Jakub Kicinski <[email protected]>,
Jonathan Lemon <[email protected]>,
"David S . Miller" <[email protected]>,
Willem de Bruijn <[email protected]>,
Eric Dumazet <[email protected]>,
Hideaki YOSHIFUJI <[email protected]>,
David Ahern <[email protected]>, Jens Axboe <[email protected]>
Subject: Re: [RFC 00/12] io_uring zerocopy send
Date: Wed, 1 Dec 2021 23:18:36 +0000 [thread overview]
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
On 12/1/21 23:07, Martin KaFai Lau wrote:
> 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.
I see, it seems we found the misunderstanding:
For dummy device, I indeed was testing only tx part without
a server, in my understanding it better approximates an actual
fast NIC. I don't think dummy is even capable to pass the data,
so was thinking that it's given that there is no receive side,
and so no "msg_zerocopy -r".
For localhost testing (with the hack), there was a server
verifying data.
>>
>>> 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
>>>
>>
--
Pavel Begunkov
next prev parent reply other threads:[~2021-12-01 23:19 UTC|newest]
Thread overview: 40+ 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
[not found] ` <[email protected]>
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
2021-12-01 23:18 ` Pavel Begunkov [this message]
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
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
[email protected] \
[email protected] \
[email protected] \
[email protected] \
[email protected] \
[email protected] \
[email protected] \
[email protected] \
[email protected] \
[email protected] \
[email protected] \
[email protected] \
[email protected] \
[email protected] \
[email protected] \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox