Sridhar Samudrala <sridhar.samudr...@intel.com> writes: > This patch introduces a new socket option SO_SYMMETRIC_QUEUES that can be used > to enable symmetric tx and rx queues on a socket. > > This option is specifically useful for epoll based multi threaded workloads > where each thread handles packets received on a single RX queue . In this > model, > we have noticed that it helps to send the packets on the same TX queue > corresponding to the queue-pair associated with the RX queue specifically when > busy poll is enabled with epoll(). > > Two new fields are added to struct sock_common to cache the last rx ifindex > and > the rx queue in the receive path of an SKB. __netdev_pick_tx() returns the > cached > rx queue when this option is enabled and the TX is happening on the same > device.
Would it help to make the rx and tx skb hashes symmetric (skb_get_hash_symmetric) on request?
