From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on gnuweeb.org X-Spam-Level: X-Spam-Status: No, score=-1.2 required=5.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,MAILING_LIST_MULTI, SPF_HELO_PASS,SPF_SOFTFAIL autolearn=ham autolearn_force=no version=3.4.6 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 68694C43334 for ; Wed, 1 Jun 2022 16:24:33 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1344314AbiFAQYc (ORCPT ); Wed, 1 Jun 2022 12:24:32 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33318 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1347929AbiFAQYc (ORCPT ); Wed, 1 Jun 2022 12:24:32 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C1C0B8D6A5 for ; Wed, 1 Jun 2022 09:24:30 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 3E65761597 for ; Wed, 1 Jun 2022 16:24:30 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 696F1C3411C; Wed, 1 Jun 2022 16:24:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1654100669; bh=yk5oVwOf9gF45vUfOuLMNv53AupSiVNfzVWdnWWAcGM=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=jS3d5JY6vWIl/Ggg4fGkN+2OLXpWNo1IvJ/JYWoJHJcK1qztTjzvgM1gRRYiC3CFU I82b2MWnDwaD6Tdp52r9VgH3OhIeNAmvIPRfbMZKuyQgwGnQ9GGfroKRZSL+4smWGj BXj6kKy2rKPKY7pgvvPkMtr5HaOXfs/NHkGnZvlyt+c667VgqxrXqPi7jUPMpm2XvK 50reInHbGESqaA7YQdhdjf+pSSj18HwZmFB7u+18CiX0GGFf7y0bPPandJfUSnqaQ4 mUspSUjrypm/nYedqyd+nLbeoWAMApeDuycmiE+4YHOF1pKm+fDJOynjqSOM2WYgVw +shEI4tojXsbg== Date: Wed, 1 Jun 2022 09:24:28 -0700 From: Jakub Kicinski To: Olivier Langlois Cc: Jens Axboe , Linus Torvalds , io-uring Subject: Re: [GIT PULL] io_uring updates for 5.18-rc1 Message-ID: <20220601092428.6e7a13a7@kernel.org> In-Reply-To: <78d9a5e2eaad11058f54b1392662099549aa925f.camel@trillion01.com> References: <20220326122838.19d7193f@kicinski-fedora-pc1c0hjn.dhcp.thefacebook.com> <9a932cc6-2cb7-7447-769f-3898b576a479@kernel.dk> <20220326130615.2d3c6c85@kicinski-fedora-pc1c0hjn.dhcp.thefacebook.com> <234e3155-e8b1-5c08-cfa3-730cc72c642c@kernel.dk> <20220326143049.671b463c@kernel.org> <78d9a5e2eaad11058f54b1392662099549aa925f.camel@trillion01.com> MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: io-uring@vger.kernel.org On Wed, 01 Jun 2022 02:59:12 -0400 Olivier Langlois wrote: > > I'm not entirely clear how the thing is supposed to be used with TCP > > socket, as from a quick grep it appears that listening sockets don't > > get napi_id marked at all. > > > > The commit mentions a UDP benchmark, Olivier can you point me to more > > info on the use case? I'm mostly familiar with NAPI busy poll with > > XDP > > sockets, where it's pretty obvious. > > https://github.com/lano1106/io_uring_udp_ping > > IDK what else I can tell you. I choose to unit test the new feature > with an UDP app because it was the simplest setup for testing. AFAIK, > the ultimate goal of busy polling is to minimize latency in packets > reception and the NAPI busy polling code should not treat differently > packets whether they are UDP or TCP or whatever the type of frames the > NIC does receive... IDK how you use the busy polling, so I'm asking you to describe what your app does. You said elsewhere that you don't have dedicated thread per queue so it's not a server app (polling for requests) but a client app (polling for responses)?