netdev - Re: [PATCH V2 2/7] tcp: use limited socket backlog

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Date:	Wed, 03 Mar 2010 17:06:02 +0800
From:	Zhu Yi <yi.zhu@...el.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"David S. Miller" <davem@...emloft.net>,
	Alexey Kuznetsov <kuznet@....inr.ac.ru>,
	"Pekka Savola (ipv6)" <pekkas@...core.fi>,
	Patrick McHardy <kaber@...sh.net>
Subject: Re: [PATCH V2 2/7] tcp: use limited socket backlog

On Wed, 2010-03-03 at 16:53 +0800, Eric Dumazet wrote:
> > @@ -1682,8 +1682,10 @@ process:
> >                       if (!tcp_prequeue(sk, skb))
> >                               ret = tcp_v4_do_rcv(sk, skb);
> >               }
> > -     } else
> > -             sk_add_backlog(sk, skb);
> > +     } else if (sk_add_backlog_limited(sk, skb)) {
> > +             bh_unlock_sock(sk);
> > +             goto discard_and_relse;
> > +     }
> >       bh_unlock_sock(sk);
> >  
> >       sock_put(sk);
> 
> So no counter is incremented to reflect this loss, sk->sk_drops (local
> counter) or SNMP ? 

I simply follow how the code is originally written. As you can see,
tcp_v4_do_rcv() doesn't always do so. And in the backlog queuing place,
we don't even bother to check.

Thanks,
-yi

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