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=-0.5 required=3.0 tests=BAYES_00,DKIM_ADSP_CUSTOM_MED, DKIM_INVALID,DKIM_SIGNED,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, 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 6FEC3C433E0 for ; Wed, 30 Dec 2020 15:26:29 +0000 (UTC) Received: from fraxinus.osuosl.org (smtp4.osuosl.org [140.211.166.137]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 02E18207A6 for ; Wed, 30 Dec 2020 15:26:28 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 02E18207A6 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=gmail.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=virtualization-bounces@lists.linux-foundation.org Received: from localhost (localhost [127.0.0.1]) by fraxinus.osuosl.org (Postfix) with ESMTP id 9FFA886199; Wed, 30 Dec 2020 15:26:28 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from fraxinus.osuosl.org ([127.0.0.1]) by localhost (.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id BrInU43hr6nA; Wed, 30 Dec 2020 15:26:26 +0000 (UTC) Received: from lists.linuxfoundation.org (lf-lists.osuosl.org [140.211.9.56]) by fraxinus.osuosl.org (Postfix) with ESMTP id 8F2F885AF1; Wed, 30 Dec 2020 15:26:26 +0000 (UTC) Received: from lf-lists.osuosl.org (localhost [127.0.0.1]) by lists.linuxfoundation.org (Postfix) with ESMTP id 6D754C0174; Wed, 30 Dec 2020 15:26:26 +0000 (UTC) Received: from silver.osuosl.org (smtp3.osuosl.org [140.211.166.136]) by lists.linuxfoundation.org (Postfix) with ESMTP id 439F5C013A for ; Wed, 30 Dec 2020 15:26:25 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by silver.osuosl.org (Postfix) with ESMTP id 26EDE20372 for ; Wed, 30 Dec 2020 15:26:25 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from silver.osuosl.org ([127.0.0.1]) by localhost (.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id j6TGOtwA5Pyk for ; Wed, 30 Dec 2020 15:26:24 +0000 (UTC) X-Greylist: domain auto-whitelisted by SQLgrey-1.7.6 Received: from mail-ed1-f54.google.com (mail-ed1-f54.google.com [209.85.208.54]) by silver.osuosl.org (Postfix) with ESMTPS id 257EC20005 for ; Wed, 30 Dec 2020 15:26:24 +0000 (UTC) Received: by mail-ed1-f54.google.com with SMTP id u19so15732666edx.2 for ; Wed, 30 Dec 2020 07:26:24 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=uFUnyHgVyxuAtcRfcUjkuOgvyPAUgs/GS4VZo6V2EjY=; b=OeyEzg4V/aAACZ5WHrZtTgzeyRkX9dR1DakXcYGb6HpW0nZLrHmNUTBsnBP2KFaiiU iOvw2Uwo16qyOH63s9Gm2Md+VIjnFMyVYx/hqyGpYmDhMIGRe/hOr4qhldPYy703A+SB JX+79yp/Mb5TAHh9HWx6HXB2+j7Y7XoMOXSlPoLN6EpTJ4nHIK1ITdK81nnnKLNjBMC4 GsOkNhjPIRcZLBXTaQZ9TMEP9Gmx9FG2VZ+2GB4D7tFfTs5uHhyYSh0IWJfdJxg9cg0p Ax5r+StVcwQLSjZPH5X4qUHE/V1FqiBD+yKiMJehgoAJkFQM3OI4745vkZXB4amaZ4ns UQNA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=uFUnyHgVyxuAtcRfcUjkuOgvyPAUgs/GS4VZo6V2EjY=; b=EVAwWI1cSKdqx+2xd/b0juoYe5Q18oQ0skMhxkQTHIeE317Z8HZqSYpGS4/CASVJ19 tTasZE90K64bthOy8QEPzP3dhDdAxAQRwy0xOT7lkrmkb3J1e8iCBfFE0X+wxfpACIAS maQIiQuC5JuYlLV+MAYFbJrioqNilZzC3YH0ELr+JD2xx1GXhnK9a8e+ymq7aKSPg31A R9xUgP68WvKF3TEMi0b7lF6PomYBo05BWXGMPgq4eJBL0ls2HQD/uXDZ6IRZVUMQGJMH AMGqrdcAsIR2FvYsrXrwv7Y3chGRNY1JGrFQbdj4NRvGit82i3wa4Q1bV90ZIEEr7arD l8XA== X-Gm-Message-State: AOAM530V4CKb9ZP+USakpt6Pl+s0JmYUKlLkNihBSG6ioEoabc0yITnz wMPmdbK/irg5yW/d88Fawao3EkM7SUlcdXn9hyg= X-Google-Smtp-Source: ABdhPJzQNQAMolyl/FTKvwlV8rMw5P1Y8XV7RnokIFHNgGsZR+KndkMpIK62C9KqeH1cViiMOgpkAg62xMVFkhZW1K4= X-Received: by 2002:aa7:c603:: with SMTP id h3mr46830503edq.254.1609341982552; Wed, 30 Dec 2020 07:26:22 -0800 (PST) MIME-Version: 1.0 References: <20201228162233.2032571-1-willemdebruijn.kernel@gmail.com> <20201228162233.2032571-4-willemdebruijn.kernel@gmail.com> <20201230123854.GB2034@hoboy.vegasvil.org> In-Reply-To: <20201230123854.GB2034@hoboy.vegasvil.org> From: Willem de Bruijn Date: Wed, 30 Dec 2020 10:25:46 -0500 Message-ID: Subject: Re: [PATCH rfc 3/3] virtio-net: support transmit timestamp To: Richard Cochran Cc: Network Development , "Michael S. Tsirkin" , Willem de Bruijn , virtualization@lists.linux-foundation.org X-BeenThere: virtualization@lists.linux-foundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Linux virtualization List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: virtualization-bounces@lists.linux-foundation.org Sender: "Virtualization" On Wed, Dec 30, 2020 at 7:38 AM Richard Cochran wrote: > > On Mon, Dec 28, 2020 at 11:22:33AM -0500, Willem de Bruijn wrote: > > From: Willem de Bruijn > > > > Add optional delivery time (SO_TXTIME) offload for virtio-net. > > > > The Linux TCP/IP stack tries to avoid bursty transmission and network > > congestion through pacing: computing an skb delivery time based on > > congestion information. Userspace protocol implementations can achieve > > the same with SO_TXTIME. This may also reduce scheduling jitter and > > improve RTT estimation. > > This description is clear, but the Subject line is confusing. It made > me wonder whether this series is somehow about host/guest synchronization > (but your comments do explain that that isn't the case). > > How about this instead? > > virtio-net: support future packet transmit time Yes, that's clearer. As is, this could easily be mistaken for SOF_TIMESTAMPING_TX_*, which it is not. Will update, thanks. Related terms already in use are SO_TXTIME, Earliest Delivery Time (EDT) and Earliest TxTime First (ETF). I should probably also s/TX_TSTAMP/TX_TIME/ in the code for the same reason. _______________________________________________ Virtualization mailing list Virtualization@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/virtualization