# Zero copy networking techniques in Linux TCP on HPE servers

**URL:** <https://forums.developer.nvidia.com/t/zero-copy-networking-techniques-in-linux-tcp-on-hpe-servers/329653>\
**Category:** Ethernet Adapter Cards\
**Created:** [April 8, 2025, 1:52pm UTC](https://forums.developer.nvidia.com/t/zero-copy-networking-techniques-in-linux-tcp-on-hpe-servers/329653 "2025-04-08T13:52:24Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![antosha20xx](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@antosha20xx](https://forums.developer.nvidia.com/u/antosha20xx)\
**Post date:** [April 8, 2025, 1:52pm UTC](https://forums.developer.nvidia.com/t/zero-copy-networking-techniques-in-linux-tcp-on-hpe-servers/329653/1 "2025-04-08T13:52:25Z")

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Hello

I would like investigate zero copy performance characteristics of two networking techniques in Linux – TCP devmem and IOURING zero copy.

Both techniques required next features - header split, flow steering, & RSS.

So on Fedora Server beta 42, I tried to enable header split on Connect-X7.

[root@localhost anton]# ethtool -G ens3f0np0 tcp-data-split on

netlink error: setting TCP data split is not supported (offset 40)

netlink error: Operation not supported

Is tcp-data-split supported on Connect-X7 ?, without that not possible configure zero copy io\_uring or devmem.

Anton

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**Author:** ![Levei\_Luo](https://sea2.discourse-cdn.com/nvidia/user_avatar/forums.developer.nvidia.com/levei_luo/32/166736_2.png) [@Levei\_Luo](https://forums.developer.nvidia.com/u/Levei_Luo)\
**Post date:** [April 10, 2025, 9:02am UTC](https://forums.developer.nvidia.com/t/zero-copy-networking-techniques-in-linux-tcp-on-hpe-servers/329653/2 "2025-04-10T09:02:58Z")

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This feature is not yet supported in ConnectX-7 currently.  
However, it may be supported in ConnectX-7/ConnectX-8 or later devices in the future.

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**Author:** ![system](https://sea2.discourse-cdn.com/nvidia/user_avatar/forums.developer.nvidia.com/system/32/68080_2.png) [@system](https://forums.developer.nvidia.com/u/system)\
**Post date:** [April 24, 2025, 9:03am UTC](https://forums.developer.nvidia.com/t/zero-copy-networking-techniques-in-linux-tcp-on-hpe-servers/329653/3 "2025-04-24T09:03:38Z")

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