From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-3.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4C2D0C35257 for ; Fri, 2 Oct 2020 23:00:45 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0D77F20719 for ; Fri, 2 Oct 2020 23:00:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1725774AbgJBXAo (ORCPT ); Fri, 2 Oct 2020 19:00:44 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49306 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725283AbgJBXAo (ORCPT ); Fri, 2 Oct 2020 19:00:44 -0400 Received: from shards.monkeyblade.net (shards.monkeyblade.net [IPv6:2620:137:e000::1:9]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 28BFCC0613D0 for ; Fri, 2 Oct 2020 16:00:44 -0700 (PDT) Received: from localhost (unknown [IPv6:2601:601:9f00:477::3d5]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (Client did not present a certificate) (Authenticated sender: davem-davemloft) by shards.monkeyblade.net (Postfix) with ESMTPSA id ECDC811E49F8C; Fri, 2 Oct 2020 15:43:55 -0700 (PDT) Date: Fri, 02 Oct 2020 16:00:42 -0700 (PDT) Message-Id: <20201002.160042.621154959486835359.davem@davemloft.net> To: weiwan@google.com Cc: netdev@vger.kernel.org, edumazet@google.com, kuba@kernel.org, hannes@stressinduktion.org, pabeni@redhat.com, nbd@nbd.name Subject: Re: [PATCH net-next 0/5] implement kthread based napi poll From: David Miller In-Reply-To: <20200930192140.4192859-1-weiwan@google.com> References: <20200930192140.4192859-1-weiwan@google.com> X-Mailer: Mew version 6.8 on Emacs 27.1 Mime-Version: 1.0 Content-Type: Text/Plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Greylist: Sender succeeded SMTP AUTH, not delayed by milter-greylist-4.5.12 (shards.monkeyblade.net [2620:137:e000::1:9]); Fri, 02 Oct 2020 15:43:56 -0700 (PDT) Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org From: Wei Wang Date: Wed, 30 Sep 2020 12:21:35 -0700 ... > And the reason we prefer 1 kthread per napi, instead of 1 workqueue > entity per host, is that kthread is more configurable than workqueue, > and we could leverage existing tuning tools for threads, like taskset, > chrt, etc to tune scheduling class and cpu set, etc. Another reason is > if we eventually want to provide busy poll feature using kernel threads > for napi poll, kthread seems to be more suitable than workqueue. ... I think we still need to discuss this some more. Jakub has some ideas and I honestly think the whole workqueue approach hasn't been fully considered yet. If this wan't urgent years ago (when it was NACK'd btw), it isn't urgent for 5.10 so I don't know why we are pushing so hard for this patch series to go in as-is right now. Please be patient and let's have a full discussion on this. Thank you.