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From: Stefan Roesch <[email protected]>
To: [email protected]
Cc: [email protected], [email protected], [email protected],
	[email protected], [email protected],
	[email protected]
Subject: [RFC PATCH v3 0/3] io_uring: add napi busy polling support
Date: Mon, 14 Nov 2022 23:08:57 -0800	[thread overview]
Message-ID: <[email protected]> (raw)

This adds the napi busy polling support in io_uring.c. It adds a new
napi_list to the io_ring_ctx structure. This list contains the list of
napi_id's that are currently enabled for busy polling. This list is
used to determine which napi id's enabled busy polling.

To set the new napi busy poll timeout, a new io-uring api has been
added. It sets the napi busy poll timeout for the corresponding ring.

There is also a corresponding liburing patch series, which enables this
feature. The name of the series is "liburing: add add api for napi busy
poll timeout". It also contains two programs to test the this.

Testing has shown that the round-trip times are reduced to 38us from
55us by enabling napi busy polling with a busy poll timeout of 100us.


Changes:
- V3:
  - Refreshed to 6.1-rc5
  - Added a new io-uring api for the prefer napi busy poll api and wire
    it to io_napi_busy_loop().
  - Removed the unregister (implemented as register)
  - Added more performance results to the first commit message.
- V2:
  - Add missing defines if CONFIG_NET_RX_BUSY_POLL is not defined
  - Changes signature of function io_napi_add_list to static inline
    if CONFIG_NET_RX_BUSY_POLL is not defined
  - define some functions as static


Signed-off-by: Stefan Roesch <[email protected]>

Stefan Roesch (3):
  io_uring: add napi busy polling support
  io_uring: add api to set napi busy poll timeout.
  io_uring: add api to set napi prefer busy poll

 include/linux/io_uring_types.h |   8 +
 include/uapi/linux/io_uring.h  |   4 +
 io_uring/io_uring.c            | 278 +++++++++++++++++++++++++++++++++
 io_uring/napi.h                |  22 +++
 io_uring/poll.c                |   3 +
 io_uring/sqpoll.c              |  10 ++
 6 files changed, 325 insertions(+)
 create mode 100644 io_uring/napi.h


base-commit: 094226ad94f471a9f19e8f8e7140a09c2625abaa
-- 
2.30.2


             reply	other threads:[~2022-11-15  7:09 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-11-15  7:08 Stefan Roesch [this message]
2022-11-15  7:08 ` [RFC PATCH v3 1/3] io_uring: add napi busy polling support Stefan Roesch
2022-11-15  7:08 ` [RFC PATCH v3 2/3] io_uring: add api to set napi busy poll timeout Stefan Roesch
2022-11-16 19:05   ` Jens Axboe
2022-11-15  7:09 ` [RFC PATCH v3 3/3] io_uring: add api to set napi prefer busy poll Stefan Roesch
2022-11-16 18:31 ` [RFC PATCH v3 0/3] io_uring: add napi busy polling support Jakub Kicinski
2022-11-16 18:44   ` Jens Axboe
2022-11-16 20:09     ` Jakub Kicinski
2022-11-16 20:12       ` Jens Axboe

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