netdev - Re: [PATCH 1/8] net: add limit for socket backlog

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Date:	Wed, 03 Mar 2010 09:02:37 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Zhu Yi <yi.zhu@...el.com>
Cc:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	David Miller <davem@...emloft.net>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	"Pekka Savola (ipv6)" <pekkas@...core.fi>,
	Patrick McHardy <kaber@...sh.net>,
	Vlad Yasevich <vladislav.yasevich@...com>,
	Sridhar Samudrala <sri@...ibm.com>,
	Per Liden <per.liden@...csson.com>,
	Jon Maloy <jon.maloy@...csson.com>,
	Allan Stephens <allan.stephens@...driver.com>,
	Andrew Hendry <andrew.hendry@...il.com>
Subject: Re: [PATCH 1/8] net: add limit for socket backlog

Le mercredi 03 mars 2010 à 15:35 +0800, Zhu Yi a écrit :
> On Wed, 2010-03-03 at 14:54 +0800, Eric Dumazet wrote:
> > > diff --git a/include/net/sock.h b/include/net/sock.h
> > > index 6cb1676..847119a 100644
> > > --- a/include/net/sock.h
> > > +++ b/include/net/sock.h
> > > @@ -253,6 +253,8 @@ struct sock {
> > >  	struct {
> > >  		struct sk_buff *head;
> > >  		struct sk_buff *tail;
> > > +		int len;
> > > +		int limit;
> > 
> > This new limit field is really not needed
> 
> sk->sk_rcvbuf can be adjusted by setsockopt from user at run time. The
> minimum allowed value is 256. I'm afraid this will break most protocols.

I see, then maybe use some offset in your test, to allow some extra
space.

#define MINBACKLOG 2048

if (sk->sk_backlog.len >= (sk->sk_rcvbuf << 1) + MINBACKLOG)
	return -ENOBUFS;



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