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

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Date:	Thu, 19 Apr 2012 19:25:06 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Rick Jones <rick.jones2@...com>
Cc:	Ilpo Järvinen <ilpo.jarvinen@...sinki.fi>,
	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 10:20 -0700, Rick Jones wrote:

> By copying them to smaller buffers? Or just by altering truesize? 
> Wasn't the whole point of fixing all the broken truesize settings to 
> accurately account for memory consumed?

I checked, their truesize are OK (1024+256) for ixgbe driver.
They could be little smaller, but not that much. (512 + 256)

No, its only the sk_rcvbuf is small for a tcp sender,
and sk_add_backlog() makes sure we dont queue more than sk_rcvbuf bytes
in backlog.





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