netdev - Re: [PATCH net-next] net: netdev_alloc_skb() use build

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Message-ID: <1338864395.2760.1967.camel@edumazet-glaptop>
Date:	Tue, 05 Jun 2012 04:46:35 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	"Michael S. Tsirkin" <mst@...hat.com>
Cc:	Willy Tarreau <w@....eu>, David Miller <davem@...emloft.net>,
	netdev@...r.kernel.org
Subject: Re: [PATCH net-next] net: netdev_alloc_skb() use build_skb()

On Tue, 2012-06-05 at 00:54 +0300, Michael S. Tsirkin wrote:

> Yes but what bugs me if the box is not under memory pressure
> this overestimation limits buffers for no real gain.
> How about we teach tcp to use data_len for buffer
> limits normally and switch to truesize when low on memory?
> 

You should first have evidence of the effect of this limitation.

I see more evidence of poor choices at driver level than core level.



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