netdev - Re: [PATCH 4/5 v2] ifb: add multiqueue support

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Date:	Wed, 15 Dec 2010 07:37:44 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Changli Gao <xiaosuo@...il.com>
Cc:	Jamal Hadi Salim <hadi@...erus.ca>,
	"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org
Subject: Re: [PATCH 4/5 v2] ifb: add multiqueue support

Le mercredi 15 décembre 2010 à 08:20 +0800, Changli Gao a écrit :
> On Tue, Dec 14, 2010 at 11:59 PM, Eric Dumazet <eric.dumazet@...il.com> wrote:
> >
> >
> > There is a problem here.
> >
> > You should sum in the loop rx_counters only, (the counters syncp
> > protected), and use dev_txq_stats_fold() to get the tx_counters from
> > core network.
> 
> Hmm, in ifb, txq->tx_counters aren't used in ifb_xmit() but
> ri_tasklet(). IOW, rx and tx are reversed. Here I use txq->tx_counters
> to reduce duplicate counters in ifb_q_private. Unless these variables
> might be accessed outside of ifb, I can use them freely? Thanks.
> 

Yes, you are right, and the txq lock is not necessary to read their
values as well (I thought it was hold at write time)



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