X-Recipient: archive-cygwin AT delorie DOT com
X-Original-To: cygwin AT cygwin DOT com
Delivered-To: cygwin AT cygwin DOT com
DMARC-Filter: OpenDMARC Filter v1.4.1 sourceware.org C2EA13858C50
Authentication-Results: sourceware.org; dmarc=none (p=none dis=none)
 header.from=SystematicSw.ab.ca
Authentication-Results: sourceware.org;
 spf=none smtp.mailfrom=systematicsw.ab.ca
X-Authority-Analysis: v=2.4 cv=Y6brDzSN c=1 sm=1 tr=0 ts=62701a16
 a=oHm12aVswOWz6TMtn9zYKg==:117 a=oHm12aVswOWz6TMtn9zYKg==:17
 a=IkcTkHD0fZMA:10 a=yMhMjlubAAAA:8 a=94nOnFI1EgyDtX4ev68A:9 a=QEXdDO2ut3YA:10
Message-ID: <3eaf09cc-17a9-5286-65b2-9af4b7e73b21@SystematicSw.ab.ca>
Date: Mon, 2 May 2022 11:51:17 -0600
MIME-Version: 1.0
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:91.0) Gecko/20100101
 Thunderbird/91.8.1
Subject: Re: Supporting new Windows UDP offload features
Content-Language: en-CA
To: cygwin AT cygwin DOT com
References: <CAMnBwJRfAxbFiz4LSdX4m2P_gKcMbzS=GYfUHLTiyUdMqi2Jfg AT mail DOT gmail DOT com>
From: Brian Inglis <Brian DOT Inglis AT SystematicSw DOT ab DOT ca>
Organization: Systematic Software
In-Reply-To: <CAMnBwJRfAxbFiz4LSdX4m2P_gKcMbzS=GYfUHLTiyUdMqi2Jfg@mail.gmail.com>
X-CMAE-Envelope: MS4xfH9gJYFom8mdUJ6lEXmaDexrhbLP26SNogrKQq/71Jq20965qi3GgYFL/tqJefrX0uBTGAfA2FG95n/4Vizy6Nhs1ZayGypMir/ueI/AM9SAxEMx58iy
 otT1ngn3fojDq89uAtQ2QiXb2bSBGd7En5kvF+DjutNVe3z2G7+1Hlo696vvvw1IHbJ9VVCbQlVd8aPs5HYWcJk0hL8Vupm6q1U=
X-Spam-Status: No, score=-1164.7 required=5.0 tests=BAYES_00, KAM_DMARC_STATUS,
 KAM_LAZY_DOMAIN_SECURITY, NICE_REPLY_A, SPF_HELO_NONE, SPF_NONE, TXREP,
 T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.4
X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on
 server2.sourceware.org
X-BeenThere: cygwin AT cygwin DOT com
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: General Cygwin discussions and problem reports <cygwin.cygwin.com>
List-Unsubscribe: <https://cygwin.com/mailman/options/cygwin>,
 <mailto:cygwin-request AT cygwin DOT com?subject=unsubscribe>
List-Archive: <https://cygwin.com/pipermail/cygwin/>
List-Post: <mailto:cygwin AT cygwin DOT com>
List-Help: <mailto:cygwin-request AT cygwin DOT com?subject=help>
List-Subscribe: <https://cygwin.com/mailman/listinfo/cygwin>,
 <mailto:cygwin-request AT cygwin DOT com?subject=subscribe>
Reply-To: cygwin AT cygwin DOT com
Content-Transfer-Encoding: 7bit
Content-Type: text/plain; charset="us-ascii"; Format="flowed"
Errors-To: cygwin-bounces+archive-cygwin=delorie DOT com AT cygwin DOT com
Sender: "Cygwin" <cygwin-bounces+archive-cygwin=delorie DOT com AT cygwin DOT com>

On 2022-05-02 08:11, Rony Ross wrote:
> Starting from Windows 10 version 2004, Windows supports UDP
> segmentation offload and UDP receive coalescing as described in
> https://docs.microsoft.com/en-us/windows-hardware/drivers/network/udp-segmentation-offload-uso-#ndis-interface-changes
> and in
> https://docs.microsoft.com/en-us/windows/win32/winsock/ipproto-udp-socket-options
> 
> It seems that in order to support UDP segmentaion offload and UDP
> receive coalescing, cygwin needs to add support for UDP_SEND_MSG_SIZE
> and UDP_RECV_MAX_COALESCED_SIZE socket options for IPPROTO_UDP
> 
> Could you please add it? If so, could you please estimate when it will
> be available?

Cygwin is an all-volunteer non-commercial open source POSIX/Linux 
emulation project, typically driven by developers' needs and interests, 
sometimes offering patchsets to add or enable features previously 
available in BSD flavours.

If you are not a developer capable of doing so, you will have to wait 
and see if any developer is inspired by your post, and has the free time 
to work on it.

You might want to help this along by expanding on some description of 
use cases, impacts, advantages, benefits, downsides, Unix parameters and 
implementations to be supported for emulation, Unix and Windows 
configuration of features, and availability on NICs, of those network 
features.

-- 
Take care. Thanks, Brian Inglis, Calgary, Alberta, Canada

This email may be disturbing to some readers as it contains
too much technical detail. Reader discretion is advised.
[Data in binary units and prefixes, physical quantities in SI.]

-- 
Problem reports:      https://cygwin.com/problems.html
FAQ:                  https://cygwin.com/faq/
Documentation:        https://cygwin.com/docs.html
Unsubscribe info:     https://cygwin.com/ml/#unsubscribe-simple