netdev - Re: [PATCH v2 net-next] tcp: avoid expensive pskb_expand

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Date:	Thu, 19 Apr 2012 13:30:18 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Ilpo Järvinen <ilpo.jarvinen@...sinki.fi>
Cc:	Neal Cardwell <ncardwell@...gle.com>,
	David Miller <davem@...emloft.net>,
	netdev <netdev@...r.kernel.org>,
	Tom Herbert <therbert@...gle.com>,
	Maciej Żenczykowski <maze@...gle.com>,
	Yuchung Cheng <ycheng@...gle.com>
Subject: Re: [PATCH v2 net-next] tcp: avoid expensive pskb_expand_head()
 calls

On Thu, 2012-04-19 at 14:10 +0300, Ilpo Järvinen wrote:

> Now that you have non-zero offset_ack, are the tcp_fragment() callsites 
> safe and working? ...I'm mostly worried about tcp_mark_head_lost which 
> does some assumptions about tp->snd_una and TCP_SKB_CB(skb)->seq, however, 
> also other fragmenting does not preserve offset_ack properly (which might 
> not be end of world though)?

Good point, I'll take a look.

I'll provide a v3 anyway with more performance data, I setup two cards
in PCI x8 slots to get full bandwidth.

Thanks


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