> > I empathize but take a closer look; seems mostly useless.
>
> I thought E1000 still uses LLTX, and if so then multiple cpus
> can most definitely get into the ->hard_start_xmit() in parallel.
Not with how the qdisc status protects it today:
include/net/pkt_sched.h:
static inline void qdisc_run(struct net_device *dev)
{
if (!netif_queue_stopped(dev) &&
!test_and_set_bit(__LINK_STATE_QDISC_RUNNING, &dev->state))
__qdisc_run(dev);
}
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