From: Eric Dumazet <eric.dumazet@gmail.com>
To: Rick Jones <rick.jones2@hp.com>
Cc: "Пламен Петров" <plamen.sisi@gmail.com>,
"David Miller" <davem@davemloft.net>,
netdev@vger.kernel.org
Subject: Re: [NET][TG3] Fwd: page allocation failure with linux 3.1.1
Date: Mon, 28 Nov 2011 20:28:14 +0100 [thread overview]
Message-ID: <1322508494.2970.14.camel@edumazet-laptop> (raw)
In-Reply-To: <4ED3DB91.9090409@hp.com>
Le lundi 28 novembre 2011 à 11:05 -0800, Rick Jones a écrit :
> On 11/28/2011 12:26 AM, Eric Dumazet wrote:
> > Since some devices might copy skb to a linear one in their
> > ndo_start_xmit(), we could set a netdev limit so that TSO can still be
> > used on these devices, but limiting number of frags to
> > 2^PAGE_ALLOC_COSTLY_ORDER
>
> How much "TSO value" remains after such a copy?
Instead of filling up to 64Kbytes + one head of data per skb, we'll fill
32kbytes (8*4Kbytes) + one head.
Thats still better than 1460 bytes per skb :)
prev parent reply other threads:[~2011-11-28 19:28 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CALkh-HhkzHb7-2LAwCNOZ-S4otfeM+tthyw2_XDbDUjFRSkKjA@mail.gmail.com>
2011-11-27 20:34 ` [NET][TG3] Fwd: page allocation failure with linux 3.1.1 Пламен Петров
2011-11-28 6:35 ` Eric Dumazet
2011-11-28 7:16 ` Пламен Петров
2011-11-28 8:26 ` Eric Dumazet
2011-11-28 19:05 ` Rick Jones
2011-11-28 19:28 ` Eric Dumazet [this message]
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