netdev - Re: Softirqs without captured packets

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Message-ID: <CALZVapmKbqcamTYTEhoerRUPpjsaLJqoTo84Fqmz+aUWWTmh2g@mail.gmail.com>
Date:	Fri, 22 Feb 2013 10:32:22 +0100
From:	Javier Domingo <javierdo1@...il.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	David Miller <davem@...emloft.net>, netdev@...r.kernel.org
Subject: Re: Softirqs without captured packets

Which is the reason for that in the poll function, not only some
drivers have that tx completion (I suppose it is to free resources),
but also to send packets in that routine?

In e1000e, I have found that it frees resources used in tx, with the
e1000_clean_tx_irq, and also, although the tx completion is first, it
executes the rx routine.

On the other hand, tg3 driver not only does the tx resources free but
also sends packets in that time, and may return from the poll thought
it might not have done rx work in the net_rx_action routine.

Why is this like that? I mean, why all the tx is done *before* the rx
thread, thought it may not do any rx work (in tg3) ?

I hope you can help me to understand the reasons,

Javier Domingo
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