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charset="utf-8" Content-Transfer-Encoding: base64 MIME-Version: 1.0 X-OriginatorOrg: nokia-bell-labs.com X-MS-Exchange-CrossTenant-Network-Message-Id: cd964d91-9beb-46a2-c51c-08d6a21e244f X-MS-Exchange-CrossTenant-originalarrivaltime: 06 Mar 2019 10:26:05.9758 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 5d471751-9675-428d-917b-70f44f9630b0 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM0PR07MB5794 Archived-At: X-Mailman-Approved-At: Thu, 07 Mar 2019 10:08:34 -0800 Subject: [tcpPrague] Implementation and experimentation of TCP Prague/L4S hackaton at IETF104 X-BeenThere: tcpprague@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "To coordinate implementation and standardisation of TCP Prague across platforms. TCP Prague will be an evolution of DCTCP designed to live alongside other TCP variants and derivatives." 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s=default; h=Content-Type:MIME-Version:Date:Message-ID: Subject:From:Cc:To:Sender:Reply-To:Content-Transfer-Encoding:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:In-Reply-To:References:List-Id:List-Help:List-Unsubscribe: List-Subscribe:List-Post:List-Owner:List-Archive; bh=fMjyR41ccdBXbwrmyXxikw0ZuktGp+kj7r2+iPQI5Q8=; b=bWtY2wWVxEQV2LP+PejN9akUR0 cGHBESNBd/dfvSgDRNRiB7hqSrk+8UIWC4sQqjVNjtV7KvsAb99qGc9dqOCjZQOVRihD6Jw1Q5xHB 0OxuX9v++10RY4EboJZprj72HCV5MroDwI3NbCF6O3gnKZgLAHaQypiBJymR+k7W80d5AyY/qClHz z79uOE1FSf1WmkUeOUjT4dLQof+vr67HV4ta3M9uAgQCUcvlezaQfJXK274j+F3tu+uqNJ30yGU2E IGXymZw/67WNTTgblhFVlUWYz7d/aXdFh+cHYkAW5aRoy3znfCnm9sBEt4kv/ri3wTzmN7YP+h8t0 as3wmhGA==; Received: from dhcp-819f.meeting.ietf.org ([31.133.129.159]:47914) by server.dnsblock1.com with esmtpsa (TLSv1.2:ECDHE-RSA-AES128-GCM-SHA256:128) (Exim 4.91) (envelope-from ) id 1h7fCD-0002ln-4Z; Sat, 23 Mar 2019 11:52:17 +0000 To: "Tilmans, Olivier (Nokia - BE/Antwerp)" , "Lebrun, David" Cc: TCP Prague List From: Bob Briscoe Message-ID: Date: Sat, 23 Mar 2019 12:52:16 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.5.1 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="------------28DA4B8AA82378DB430D3301" Content-Language: en-GB X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - server.dnsblock1.com X-AntiAbuse: Original Domain - ietf.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - bobbriscoe.net X-Get-Message-Sender-Via: server.dnsblock1.com: authenticated_id: in@bobbriscoe.net X-Authenticated-Sender: server.dnsblock1.com: in@bobbriscoe.net Archived-At: Subject: [tcpPrague] GRO for AccECN, DCTCP feedback and ECN feedback X-BeenThere: tcpprague@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "To coordinate implementation and standardisation of TCP Prague across platforms. TCP Prague will be an evolution of DCTCP designed to live alongside other TCP variants and derivatives." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 23 Mar 2019 12:29:26 -0000 This is a multi-part message in MIME format. --------------28DA4B8AA82378DB430D3301 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Olivier, David, To record our current discussions on this in the hackathon: I think the only thing that software or hardware GRO have to do is mask the three 'ACE' TCP flags (AE, CWR & ECE) in the TCP header, so they will coalesce packets irrespective of the 3 ECN flags. Currently * CWR==1 flushes GRO * a change in ECE flushes GRO If we are going to mask both of them, we need to understand how much benefit each one gives for each of AccECN, DCTCP-style and classic ECN feedback: * DCTCP o ECE: if a change to ECE is held back while coalescing, the same packets will still be considered within the same RTT (because an RTT is defined up to when the packet at the start of the RTT is ACK'd). So DCTCP's accumulation of the ECE changes will still give exactly the same EWMA result. The only difference will be a longer RTT, which is the known tradeoff with segmentation offload. o CWR: ignored - no problem * AccECN o All 3 ACE flags: Same tradeoff as for ECE with DCTCP * Classic ECN o CWR: stops setting ECE once CWR arrives. If it sends ECE for a bit longer, no problem o ECE: it will get the leading edge of a new ECE volly later, so it will respond later. Conclusions: * If a machine implements only Classic ECN feedback, do not mask the 3 ECN flags * If a machine implements DCTCP-style feedback (in a controlled environment), masking the 3 ECN flags for GRO does good and no harm * If a machine implements AccECN feedback, masking the 3 ECN flags for GRO does good and no harm Mixtures of connections: * On a machine that implements AccECN or DCTCP-style feedback and therefore masks the ACE field, If an individual connection has to fall back to Classic ECN, it will exhibit a delayed response to ECE. Is this OK? Bob -- ________________________________________________________________ Bob Briscoe http://bobbriscoe.net/ --------------28DA4B8AA82378DB430D3301 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: 7bit Olivier, David,

To record our current discussions on this in the hackathon:

I think the only thing that software or hardware GRO have to do is mask the three 'ACE' TCP flags (AE, CWR & ECE) in the TCP header, so they will coalesce packets irrespective of the 3 ECN flags.

Currently
* CWR==1 flushes GRO
* a change in ECE flushes GRO

If we are going to mask both of them, we need to understand how much benefit each one gives for each of AccECN, DCTCP-style and classic ECN feedback:
  • DCTCP
    • ECE: if a change to ECE is held back while coalescing, the same packets will still be considered within the same RTT (because an RTT is defined up to when the packet at the start of the RTT is ACK'd). So DCTCP's accumulation of the ECE changes will still give exactly the same EWMA result. The only difference will be a longer RTT, which is the known tradeoff with segmentation offload.
    • CWR: ignored - no problem
  • AccECN
    • All 3 ACE flags: Same tradeoff as for ECE with DCTCP
  • Classic ECN
    • CWR: stops setting ECE once CWR arrives. If it sends ECE for a bit longer, no problem
    • ECE: it will get the leading edge of a new ECE volly later, so it will respond later.

Conclusions:
* If a machine implements only Classic ECN feedback, do not mask the 3 ECN flags
* If a machine implements DCTCP-style feedback (in a controlled environment), masking the 3 ECN flags for GRO does good and no harm
* If a machine implements AccECN feedback, masking the 3 ECN flags for GRO does good and no harm

Mixtures of connections:
* On a machine that implements AccECN or DCTCP-style feedback and therefore masks the ACE field, If an individual connection has to fall back to Classic ECN, it will exhibit a delayed response to ECE.

Is this OK?




Bob


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________________________________________________________________
Bob Briscoe                               http://bobbriscoe.net/
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