From: Eric Dumazet <eric.dumazet@gmail.com>
To: David Miller <davem@davemloft.net>
Cc: netdev@vger.kernel.org, wey-yi.w.guy@intel.com,
Neal Cardwell <ncardwell@google.com>
Subject: Re: [RFC] skb truesize last offenders
Date: Fri, 23 Mar 2012 11:55:19 -0700 [thread overview]
Message-ID: <1332528919.2516.2.camel@edumazet-glaptop> (raw)
In-Reply-To: <20120323.143826.1042705555491529895.davem@davemloft.net>
On Fri, 2012-03-23 at 14:38 -0400, David Miller wrote:
> From: Eric Dumazet <eric.dumazet@gmail.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.
Sure, I can work on this issue with Neal asap, we do have some ideas on
this subject.
next prev parent reply other threads:[~2012-03-23 18:55 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-03-23 12:51 [RFC] skb truesize last offenders Eric Dumazet
2012-03-23 18:38 ` David Miller
2012-03-23 18:55 ` Eric Dumazet [this message]
2012-03-24 0:05 ` [PATCH] iwlwifi: fix skb truesize underestimation Eric Dumazet
2012-03-24 0:22 ` Eric Dumazet
2012-03-24 0:29 ` [PATCH v2] " Eric Dumazet
2012-03-24 15:35 ` Guy, Wey-Yi
2012-03-24 16:12 ` Eric Dumazet
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