netdev - Re: How do queue-less virtual devices wake higher level senders?

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Date:	Mon, 01 Oct 2007 20:44:29 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	greearb@...delatech.com
Cc:	netdev@...r.kernel.org
Subject: Re: How do queue-less virtual devices wake higher level senders?

From: Ben Greear <greearb@...delatech.com>
Date: Mon, 01 Oct 2007 17:24:26 -0700

> David Miller wrote:
> > From: Ben Greear <greearb@...delatech.com>
> > Date: Mon, 01 Oct 2007 16:49:06 -0700
> > 
> >> For 'real' hardware, it seems that the netif_stop_queue and
> >> netif_wake_queue methods handle stopping and waking the
> >> higher level senders, but for virtual devices with no
> >> queues, how does this work?
> > 
> > They don't queue, there is nothing to stop or wakeup.
> 
> Ok, so if I have a UDP socket bound to an interface that has
> no queue, and yet I see the send portion of the queue being
> full in netstat, what does this mean?

The physical device sitting behind the virtual one is where
queue stop and wakeup operations might be occuring.
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