linux-kernel - Re: txqueuelen has wrong units; should be time

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Message-ID: <1298957818.2676.15.camel@edumazet-laptop>
Date:	Tue, 01 Mar 2011 06:36:58 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Albert Cahalan <acahalan@...il.com>
Cc:	John Heffner <johnwheffner@...il.com>,
	"John W. Linville" <linville@...driver.com>,
	Jussi Kivilinna <jussi.kivilinna@...et.fi>,
	Mikael Abrahamsson <swmike@....pp.se>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	netdev@...r.kernel.org
Subject: Re: txqueuelen has wrong units; should be time

Le mardi 01 mars 2011 à 06:01 +0100, Eric Dumazet a écrit :
> Le lundi 28 février 2011 à 23:11 -0500, Albert Cahalan a écrit :
> 
> > It sounds like you need a callback or similar, so that TCP can be
> > informed later that the drop has occurred.
> 
> There is the thing called skb destructor / skb_orphan() mess, that is
> not stackable... Might extend this to something more clever, and be able
> to call functions (into TCP stack for example) giving a status of skb :
> Sent, or dropped somewhere in the stack...
> 

One problem of such schem is the huge extra cost involved, extra
locking, extra memory allocations, extra atomic operations...



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