Zero copy networking techniques in Linux TCP on HPE servers

Infrastructure & Networking Adapters and Cables Ethernet Adapter Cards
1

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

2

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.

3

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