On Wed, 2020-07-08 at 13:16 -0700, Cong Wang wrote: > On Tue, Jul 7, 2020 at 7:18 AM Paolo Abeni <pab...@redhat.com> wrote: > > So the regression with 2 pktgen threads is still relevant. 'perf' shows > > relevant time spent into net_tx_action() and __netif_schedule(). > > So, touching the __QDISC_STATE_SCHED bit in __dev_xmit_skb() is > not a good idea. > > Let me see if there is any other way to fix this.
Thank you very much for the effort! I'm personally out of ideas for a real fix that would avoid regressions. To be more exaustive this are the sources of overhead, as far as I can observe them with perf: - contention on q->state, in __netif_schedule() - execution of net_tx_action() when there are no packet to be served Cheers, Paolo
