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From: Simon Horman <[email protected]>
To: Stefan Roesch <[email protected]>
Cc: [email protected], [email protected], [email protected],
	[email protected], [email protected], [email protected],
	[email protected]
Subject: Re: [PATCH v13 4/7] io-uring: add napi busy poll support
Date: Fri, 19 May 2023 11:53:29 +0200	[thread overview]
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>

On Thu, May 18, 2023 at 02:17:48PM -0700, Stefan Roesch wrote:
> 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. The list is
> synchronized by the new napi_lock spin lock. The current default napi
> busy polling time is stored in napi_busy_poll_to. If napi busy polling
> is not enabled, the value is 0.
> In addition there is also a hash table. The hash table store the napi
> id ond the pointer to the above list nodes. The hash table is used to

nit: is 'ond' correct here?

> speed up the lookup to the list elements. The hash table is synchronized
> with rcu.
> The NAPI_TIMEOUT is stored as a timeout to make sure that the time a
> napi entry is stored in the napi list is limited.
> The busy poll timeout is also stored as part of the io_wait_queue. This
> is necessary as for sq polling the poll interval needs to be adjusted
> and the napi callback allows only to pass in one value.
> This has been tested with two simple programs from the liburing library
> repository: the napi client and the napi server program. The client
> sends a request, which has a timestamp in its payload and the server
> replies with the same payload. The client calculates the roundtrip time

nit: --codespell says:

:636: WARNING: 'calcualte' may be misspelled - perhaps 'calculate'?
and stores it to calcualte the results.


  parent reply	other threads:[~2023-05-19  9:53 UTC|newest]

Thread overview: 26+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-05-18 21:17 [PATCH v13 0/7] io_uring: add napi busy polling support Stefan Roesch
2023-05-18 21:17 ` [PATCH v13 1/7] net: split off __napi_busy_poll from napi_busy_poll Stefan Roesch
2023-05-31 17:26   ` Jakub Kicinski
2023-06-05 17:47     ` Stefan Roesch
2023-06-05 18:00       ` Jakub Kicinski
     [not found]   ` <[email protected]>
     [not found]     ` <[email protected]>
2023-06-01  4:15       ` Jakub Kicinski
2023-06-02  4:12         ` Stefan Roesch
2023-06-02  4:26           ` Jakub Kicinski
2023-05-18 21:17 ` [PATCH v13 2/7] net: introduce napi_busy_loop_rcu() Stefan Roesch
     [not found]   ` <[email protected]>
2023-05-31 17:38     ` Jakub Kicinski
2023-06-05 17:45     ` Stefan Roesch
2023-05-18 21:17 ` [PATCH v13 3/7] io-uring: move io_wait_queue definition to header file Stefan Roesch
2023-05-18 21:17 ` [PATCH v13 4/7] io-uring: add napi busy poll support Stefan Roesch
2023-05-19  1:26   ` Jens Axboe
2023-05-19 23:11     ` Stefan Roesch
2023-05-19  9:53   ` Simon Horman [this message]
2023-05-19 23:17     ` Stefan Roesch
2023-05-18 21:17 ` [PATCH v13 5/7] io-uring: add sqpoll support for napi busy poll Stefan Roesch
2023-05-19  0:11   ` kernel test robot
2023-05-19  1:13     ` Jens Axboe
2023-05-19 23:29       ` Stefan Roesch
2023-05-19  4:35   ` kernel test robot
2023-05-18 21:17 ` [PATCH v13 6/7] io_uring: add register/unregister napi function Stefan Roesch
2023-05-19  1:30   ` Jens Axboe
2023-05-18 21:17 ` [PATCH v13 7/7] io_uring: add prefer busy poll to register and unregister napi api Stefan Roesch
2023-05-19  1:31 ` [PATCH v13 0/7] io_uring: add napi busy polling support Jens Axboe

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