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=-7.0 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY,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 DC36CC433E0 for ; Sat, 1 Aug 2020 00:00:58 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id BCE8920838 for ; Sat, 1 Aug 2020 00:00:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727978AbgHAAA5 (ORCPT ); Fri, 31 Jul 2020 20:00:57 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53876 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726099AbgHAAA5 (ORCPT ); Fri, 31 Jul 2020 20:00:57 -0400 Received: from shards.monkeyblade.net (shards.monkeyblade.net [IPv6:2620:137:e000::1:9]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8670BC06174A for ; Fri, 31 Jul 2020 17:00:57 -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 D283211E58FA9; Fri, 31 Jul 2020 16:44:11 -0700 (PDT) Date: Fri, 31 Jul 2020 17:00:56 -0700 (PDT) Message-Id: <20200731.170056.2160921698138656684.davem@davemloft.net> To: ysseung@google.com Cc: netdev@vger.kernel.org, edumazet@google.com, ncardwell@google.com, soheil@google.com, ycheng@google.com Subject: Re: [PATCH net-next] tcp: add earliest departure time to SCM_TIMESTAMPING_OPT_STATS From: David Miller In-Reply-To: <20200730224440.2930115-1-ysseung@google.com> References: <20200730224440.2930115-1-ysseung@google.com> X-Mailer: Mew version 6.8 on Emacs 26.3 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 [149.20.54.216]); Fri, 31 Jul 2020 16:44:12 -0700 (PDT) Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org From: Yousuk Seung Date: Thu, 30 Jul 2020 15:44:40 -0700 > This change adds TCP_NLA_EDT to SCM_TIMESTAMPING_OPT_STATS that reports > the earliest departure time(EDT) of the timestamped skb. By tracking EDT > values of the skb from different timestamps, we can observe when and how > much the value changed. This allows to measure the precise delay > injected on the sender host e.g. by a bpf-base throttler. > > Signed-off-by: Yousuk Seung > Signed-off-by: Eric Dumazet > Acked-by: Neal Cardwell > Acked-by: Soheil Hassas Yeganeh > Acked-by: Yuchung Cheng Applied, thanks.