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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id D6463C74A5B for ; Thu, 30 Mar 2023 03:57:54 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229555AbjC3D5x (ORCPT ); Wed, 29 Mar 2023 23:57:53 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39258 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229525AbjC3D5w (ORCPT ); Wed, 29 Mar 2023 23:57:52 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [IPv6:2604:1380:4601:e00::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 36FD14C35 for ; Wed, 29 Mar 2023 20:57:51 -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 ams.source.kernel.org (Postfix) with ESMTPS id CA735B82100 for ; Thu, 30 Mar 2023 03:57:49 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 3DF9AC433D2; Thu, 30 Mar 2023 03:57:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1680148668; bh=GM+1nF7UmArM3iyAFikUsyHP5u/M46DmQIVOKVbFl8k=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=rb4+A+gFdu2X8/y7ae7I7koECc2JBUHW4DKbBSQ5uzLgBrgL5bd02F1odVAS98iCO JXkjuAEz6EIgLUsrbI6aQoXKOn5J/QG4LZH7RA60IqIWfYopXRD9G16daHEwW4hiH7 eHgYjTQfbwC/9E2ILGP4V0Pbj26T5qLYV/TkN7epM66q9oZ1ECZ/ZPp3QGydXMeHR3 n0RZqxrSgn2kJNgdyQCfenBC0yUkaO77lokyFRq/pqvySwSwFN9k4lBaajJpqSn9TQ pXTZ0dCA5zc6YbTG/naQ9UxOggSRKK/Y3D+1MJwCdI7g0gD69cEciIgawE9XnEuCfR OJS5U7IgWkjHA== Date: Wed, 29 Mar 2023 20:57:47 -0700 From: Jakub Kicinski To: Eric Dumazet Cc: "David S . Miller" , Paolo Abeni , Jason Xing , netdev@vger.kernel.org, eric.dumazet@gmail.com Subject: Re: [PATCH net-next 0/4] net: rps/rfs improvements Message-ID: <20230329205747.3ed24339@kernel.org> In-Reply-To: References: <20230328235021.1048163-1-edumazet@google.com> <20230329200403.095be0f7@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org On Thu, 30 Mar 2023 05:39:35 +0200 Eric Dumazet wrote: > > This was from "grep NET_RX /proc/softirqs" (more exactly a tool > > parsing /proc/softirqs) > > > > So it should match the number of calls to net_rx_action(), but I can > > double check if you want. > > > > (I had a simple hack to enable/disable the optimizations with a hijacked sysctl) > > Trace of real debug session, because numbers ;) > Old platform with two Intel(R) Xeon(R) Gold 6268L CPU @ 2.80GHz (96 > threads total) > > 600 tcp_rr flows > > iroa23:/home/edumazet# cat /proc/sys/net/core/netdev_max_backlog > 1000 > iroa23:/home/edumazet# ./interrupts > hrtimer:99518 cal:2421783 timer:1034 sched:80505 rcu:7661 rps:2390765 > net_tx:43 net_rx:3344637 eth1-rx:295134 eth1-tx:558933 eth1:854074 > ^C > iroa23:/home/edumazet# echo 1001 >/proc/sys/net/core/netdev_max_backlog > iroa23:/home/edumazet# ./interrupts > hrtimer:99545 cal:2358993 timer:1086 sched:77806 rcu:10928 rps:2419052 > net_tx:21 net_rx:3016301 eth1-rx:294612 eth1-tx:560331 eth1:855083 > ^C > > echo "(3344637 - 3016301)/3344637" | bc -ql > .09816790282473105452 Very nice, thanks! (I didn't know about /proc/softirqs !)