From patchwork Tue Nov 15 07:08:57 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stefan Roesch X-Patchwork-Id: 13043276 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0AD2FC4332F for ; Tue, 15 Nov 2022 07:09:38 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232502AbiKOHJh (ORCPT ); Tue, 15 Nov 2022 02:09:37 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37392 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232508AbiKOHJZ (ORCPT ); Tue, 15 Nov 2022 02:09:25 -0500 Received: from 66-220-144-178.mail-mxout.facebook.com (66-220-144-178.mail-mxout.facebook.com [66.220.144.178]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id CFCFF7674 for ; Mon, 14 Nov 2022 23:09:18 -0800 (PST) Received: by dev0134.prn3.facebook.com (Postfix, from userid 425415) id ED85615F0F5D; Mon, 14 Nov 2022 23:09:04 -0800 (PST) From: Stefan Roesch To: kernel-team@fb.com Cc: shr@devkernel.io, axboe@kernel.dk, olivier@trillion01.com, netdev@vger.kernel.org, io-uring@vger.kernel.org, kuba@kernel.org Subject: [RFC PATCH v3 0/3] io_uring: add napi busy polling support Date: Mon, 14 Nov 2022 23:08:57 -0800 Message-Id: <20221115070900.1788837-1-shr@devkernel.io> X-Mailer: git-send-email 2.30.2 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: io-uring@vger.kernel.org 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 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 Acked-by: Jakub Kicinski