Re: [PATCH net-next v2 2/2] net: dev: introduce support for sch BYPASS for lockless qdisc

[Eric Dumazet]

On 03/22/2019 01:30 AM, Paolo Abeni wrote:
> With commit c5ad119fb6c0 ("net: sched: pfifo_fast use skb_array")
> pfifo_fast no longer benefit from the TCQ_F_CAN_BYPASS optimization.
> Due to retpolines the cost of the enqueue()/dequeue() pair has become
> relevant and we observe measurable regression for the uncontended
> scenario when the packet-rate is below line rate.

Reviewed-by: Eric Dumazet <eduma...@google.com>