mxge: Setup mbuf flowid before calling tcp_lro_rx().

[gallatin]

Note that the hardware is only semi-RSS capable, which is why it is using an opaque flowid derived from the queue id.

By default, a "cheap" hash is done in the NIC, rather than a toeplitz hash, and the hash result is not passed to the driver. The NIC can perform a toeplitz hash, but that cuts packet rate by about 40%.

[sepherosa_gmail.com]

In D6320#134228, @gallatin wrote:

Note that the hardware is only semi-RSS capable, which is why it is using an opaque flowid derived from the queue id.

By default, a "cheap" hash is done in the NIC, rather than a toeplitz hash, and the hash result is not passed to the driver. The NIC can perform a toeplitz hash, but that cuts packet rate by about 40%.

Yeah, I have tested the RSS from NIC as you had told me several years ago, even the bulk data rate is reduced by ~12%, IIRC :P