netdev - Re: [RFC] skb truesize last offenders

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Date:	Fri, 23 Mar 2012 14:38:26 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	netdev@...r.kernel.org, wey-yi.w.guy@...el.com
Subject: Re: [RFC] skb truesize last offenders

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Fri, 23 Mar 2012 05:51:52 -0700

> iwlwifi and some other users of skb_add_rx_frag() lie about skb
> truesize, because of API being lazy.
> 
> iwlwifi can use order-0 or order-1 pages and skb truesize is wrong.
> network sbs can use uncharged kernel memory and eventually crash machine
> in OOM.
> 
> I plan : 
> 
> 1) adding a @truesize parameter to skb_add_rx_frag() in a neutral patch
> 
> 2) fix drivers that dont charge the real size of fragment
> 
> 3) niu could then use skb_add_rx_frag() instead of custom code.

No objections from me.  But we really have to fix that
tcp_grow_window() issue, it's quite urgent if you ask me.
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