netdev - Re: [PATCH] tipc: flow control should not account for sk

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Message-ID: <1349346360.16011.36.camel@edumazet-glaptop>
Date:	Thu, 04 Oct 2012 12:26:00 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Erik Hugne <erik.hugne@...csson.com>
Cc:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	Jon Maloy <jon.maloy@...csson.com>,
	"ying.xue@...driver.com" <ying.xue@...driver.com>,
	"paul.gortmaker@...driver.com" <paul.gortmaker@...driver.com>
Subject: Re: [PATCH] tipc: flow control should not account for sk_rcvbuf

On Thu, 2012-10-04 at 11:59 +0200, Erik Hugne wrote:
> > What guarantee do we have this cannot use all kernel memory ?
> >
> > If sk->sk_rcvbuf is not an acceptable limit here, you must use a
> > different limit, but not infinity.
> >
> There is an implicit limit on how much data that can be buffered on each 
> socket, controlled by TIPC_FLOW_CONTROL_WIN.
> 
> This limit is:
> TIPC_FLOW_CONTROL_WIN * 2 * TIPC_MAX_USER_MSG_SIZE

And this limit is tested _before_ queueing to backlog if socket is owned
by the user ?

You'll have to demonstrate this in the changelog.

Again, I dont think this patch is safe, we need an explicit limit.



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