IETF Logo Mail Archive

Re: [quicwg/base-drafts] kDefaultInitialRtt too large (#752)

Martin Thomson <notifications@github.com> Wed, 30 August 2017 05:49 UTC

Return-Path: <bounces+848413-a050-quic-issues=ietf.org@sgmail.github.com>
X-Original-To: quic-issues@ietfa.amsl.com
Delivered-To: quic-issues@ietfa.amsl.com
Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 7BFF913218F for <quic-issues@ietfa.amsl.com>; Tue, 29 Aug 2017 22:49:59 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -4.799
X-Spam-Level:
X-Spam-Status: No, score=-4.799 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, HTML_IMAGE_ONLY_32=0.001, HTML_MESSAGE=0.001, RCVD_IN_MSPIKE_H2=-2.8, SPF_PASS=-0.001] autolearn=ham autolearn_force=no
Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=github.com
Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id UPOy_5LQPMxH for <quic-issues@ietfa.amsl.com>; Tue, 29 Aug 2017 22:49:57 -0700 (PDT)
Received: from o5.sgmail.github.com (o5.sgmail.github.com [192.254.113.10]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 993B2126B71 for <quic-issues@ietf.org>; Tue, 29 Aug 2017 22:49:57 -0700 (PDT)
DKIM-Signature: v=1; a=rsa-sha1; c=relaxed/relaxed; d=github.com; h=from:reply-to:to:cc:in-reply-to:references:subject:mime-version:content-type:content-transfer-encoding:list-id:list-archive:list-post:list-unsubscribe; s=s20150108; bh=+r8jasLB/JFHcRClQA1v1XG/Tv0=; b=vY6HkIF1UbYq7HO0 JmVSHVscSY24en6erruKgly0lHjfMTEXvL1wsGC+j14xNnNKmkK9YRroR66s4sA4 LYQ/vejOvEbGjaf7I0w064mFewQ5CECUHF+5u6QWyJ+ylXL3TqRFjDYEtEV9icu3 Toq/fMrgLKU+7+h19q2JDhVNvNA=
Received: by filter0544p1mdw1.sendgrid.net with SMTP id filter0544p1mdw1-28102-59A65204-39 2017-08-30 05:49:56.725707569 +0000 UTC
Received: from github-smtp2b-ext-cp1-prd.iad.github.net (github-smtp2b-ext-cp1-prd.iad.github.net [192.30.253.17]) by ismtpd0029p1mdw1.sendgrid.net (SG) with ESMTP id 4xHyP6pIS8-XZSNCmXl7YA for <quic-issues@ietf.org>; Wed, 30 Aug 2017 05:49:56.670 +0000 (UTC)
Date: Wed, 30 Aug 2017 05:49:56 +0000
From: Martin Thomson <notifications@github.com>
Reply-To: quicwg/base-drafts <reply+0166e4abd8523413de576ebe075591dcc2b34ea2063a7daf92cf0000000115be140492a169ce0f1cc61a@reply.github.com>
To: quicwg/base-drafts <base-drafts@noreply.github.com>
Cc: Subscribed <subscribed@noreply.github.com>
Message-ID: <quicwg/base-drafts/issues/752/325888670@github.com>
In-Reply-To: <quicwg/base-drafts/issues/752@github.com>
References: <quicwg/base-drafts/issues/752@github.com>
Subject: Re: [quicwg/base-drafts] kDefaultInitialRtt too large (#752)
Mime-Version: 1.0
Content-Type: multipart/alternative; boundary="--==_mimepart_59a65204525e5_33473fe58ad7fc3027247"; charset="UTF-8"
Content-Transfer-Encoding: 7bit
Precedence: list
X-GitHub-Sender: martinthomson
X-GitHub-Recipient: quic-issues
X-GitHub-Reason: subscribed
X-Auto-Response-Suppress: All
X-GitHub-Recipient-Address: quic-issues@ietf.org
X-SG-EID: l64QuQ2uJCcEyUykJbxN122A6QRmEpucztpreh3Pak2NCGIddc6ALKLglLn/0yftqtOpfVRv4elAbk d3ZZbuAxOILJ4wNtmcoQ8/9gF3J7LMsNx1ZU+a3BFBPqDiY7JB8zWdqTnPvnyNptOet2q+veF3ej68 QDEMPDNWAlhfwQI0bJsk8i/Re4nL/TBEh6G+6W2PvH1WveNAnxxVgO9JOpqX2sQno2Uw8K08YcRSYA 4=
Archived-At: <https://mailarchive.ietf.org/arch/msg/quic-issues/hSUofN1qhFrUTQcFEfULbrR4FMU>
X-BeenThere: quic-issues@ietf.org
X-Mailman-Version: 2.1.22
List-Id: Notification list for GitHub issues related to the QUIC WG <quic-issues.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/quic-issues>, <mailto:quic-issues-request@ietf.org?subject=unsubscribe>
List-Archive: <https://mailarchive.ietf.org/arch/browse/quic-issues/>
List-Post: <mailto:quic-issues@ietf.org>
List-Help: <mailto:quic-issues-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/quic-issues>, <mailto:quic-issues-request@ietf.org?subject=subscribe>
X-List-Received-Date: Wed, 30 Aug 2017 05:49:59 -0000

I don't know whether this is a value that needs to be larger than any known path, or just typical.  I don't know how you could measure "typical", but there you have it.

I know that big providers see much lower RTTs than this because they are typically close to all of their clients, so a smaller value here does give them a small advantage.  And big providers dominate our telemetry, so it's hard to know.

For reference, I have a ping of 48ms to Google and Bing (both of which are probably about 20km away), 250ms to GitHub (which appears to be on the other side of an ocean), Yahoo is at 360ms, duckduckgo is around 400.  Facebook wins at 45ms, but it's really erratic.

-- 
You are receiving this because you are subscribed to this thread.
Reply to this email directly or view it on GitHub:
https://github.com/quicwg/base-drafts/issues/752#issuecomment-325888670

v2.35.0 | Report a Bug | By Email | System Status