netdev - Re: [PATCH net-next] tcp: reduce memory needs of out of order queue

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Message-Id: <20111014.191845.232827637484150228.davem@davemloft.net>
Date:	Fri, 14 Oct 2011 19:18:45 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	rick.jones2@...com
Cc:	eric.dumazet@...il.com, netdev@...r.kernel.org
Subject: Re: [PATCH net-next] tcp: reduce memory needs of out of order queue

From: Rick Jones <rick.jones2@...com>
Date: Fri, 14 Oct 2011 15:12:04 -0700

> From just a very quick look it looks like tcp_v[46]_rcv is called,
> finds that the socket is owned by the user, attempts to add to the
> backlog, but the path called by sk_add_backlog does not seem to make
> any attempts to compress things, so when the quantity of data is <<
> the truesize it starts tossing babies out with the bathwater.

This is why I don't believe the right fix is to add bandaids all
around the TCP layer.

The wastage has to be avoided at a higher level.
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