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Wed, 25 Feb 2026 15:07:02 +0000 (GMT) Message-ID: <48e429f3-e29f-4eac-b4d3-3bf9e0d1c245@linux.ibm.com> Date: Wed, 25 Feb 2026 20:37:00 +0530 Precedence: bulk X-Mailing-List: mptcp@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [LSF/MM/BPF TOPIC] NVMe over MPTCP: Multi-Fold Acceleration for NVMe over TCP in Multi-NIC Environments To: Geliang Tang , lsf-pc@lists.linux-foundation.org, linux-nvme@lists.infradead.org Cc: mptcp@lists.linux.dev, Matthieu Baerts , Mat Martineau , Paolo Abeni , Hannes Reinecke References: Content-Language: en-US From: Nilay Shroff In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: o4yHT0Y6Ipf_NKyOCT9Rof1HsuruXP4r X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMjI1MDE0MCBTYWx0ZWRfX8HOaGhAHdkch wI+Iyd0YTjp+9dkDsGz+TKjiOM8t9P8w5ZyQ9svMdLnGYeu2pmOq4pK8S4qExzK40ne+0QRoej6 yDLmGs8GwUfyORc+Kc2zfnkwz4FBsUUMAcaoIsvhs9cnnxBWa+nQICIw3aiRTH9oVafpW51kUqO ULqnP+r90WuumtxXvCp1D3Db77FWHOYtEr4doSZyfl3AFUHOezXFeGekRRSPgHg5IXU8CeRaG7X NYjU8wOtbHraiXGTga0sdJUKFItHjaKUIDAqjiwl1dlf4CDqZti4eczVPohpXYrYgfq6Qam05fZ LrLxEu1rhUSkFVzRpeb/0oM7JjadHEIwkfFU78JP2IwW39YdbuDWUpNOrgZQxfz+dZ6LoDQGXzR ccrKizo6rV15P/qN6xuRoKfCSr9Um+LUfV3V6N7WIlEr6k5MFbeIkqWe/O0sYjp7n338s7/s/c2 bbLpFHK9EaoWd3Cd4GA== X-Authority-Analysis: v=2.4 cv=R7wO2NRX c=1 sm=1 tr=0 ts=699f101d cx=c_pps a=5BHTudwdYE3Te8bg5FgnPg==:117 a=5BHTudwdYE3Te8bg5FgnPg==:17 a=IkcTkHD0fZMA:10 a=HzLeVaNsDn8A:10 a=VkNPw1HP01LnGYTKEx00:22 a=Mpw57Om8IfrbqaoTuvik:22 a=GgsMoib0sEa3-_RKJdDe:22 a=Avx83NJuEvaYE25EaHwA:9 a=QEXdDO2ut3YA:10 X-Proofpoint-GUID: o4yHT0Y6Ipf_NKyOCT9Rof1HsuruXP4r X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1121,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-02-25_01,2026-02-25_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 clxscore=1011 impostorscore=0 phishscore=0 spamscore=0 suspectscore=0 malwarescore=0 bulkscore=0 adultscore=0 lowpriorityscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2601150000 definitions=main-2602250140 On 1/29/26 9:43 AM, Geliang Tang wrote: > 3. Performance Benefits > > This new feature has been evaluated in different environments: > > I conducted 'NVMe over MPTCP' tests between two PCs, each equipped with > two Gigabit NICs and directly connected via Ethernet cables. Using > 'NVMe over TCP', the fio benchmark showed a speed of approximately 100 > MiB/s. In contrast, 'NVMe over MPTCP' achieved about 200 MiB/s with > fio, doubling the throughput. > > In a virtual machine test environment simulating four NICs on both > sides, 'NVMe over MPTCP' delivered bandwidth up to four times that of > standard TCP. This is interesting. Did you try using an NVMe multipath iopolicy other than the default numa policy? Assuming both the host and target are multihomed, configuring round-robin or queue-depth may provide performance comparable to what you are seeing with MPTCP. I think MPTCP shall distribute traffic using transport-level metrics such as RTT, cwnd, and packet loss, whereas the NVMe multipath layer makes decisions based on ANA state, queue depth, and NUMA locality. In a setup with multiple active paths, switching the iopolicy from numa to round-robin or queue-depth could improve load distribution across controllers and thus improve performance. IMO, it would be useful to test with those policies and compare the results against the MPTCP setup. Thanks, --Nilay