Re: [Xen-devel] NAPI rescheduling and the delay caused by it

[Eric Dumazet <eric.dumazet@xxxxxxxxx>]

On Wed, 2013-12-04 at 21:23 +0000, Zoltan Kiss wrote:

> I see netif_rx_ni makes sure the softirq is executed, but I'm not sure I 
> get how is it related to wake_queue. Can you explain a bit more?
> 

Calling netif_wake_queue() from process context makes no guarantee the
TX softirq is processed in the following cycles.

This interface is meant to be used from softirq context.


Try to enclose it in :

void xenvif_notify_tx_completion(struct xenvif *vif)
{
        if (netif_queue_stopped(vif->dev) && xenvif_rx_schedulable(vif)) {
                local_bh_disable();
                netif_wake_queue(vif->dev);
                local_bh_enable();
        }
}



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