netdev - Re: TCP transmit performance regression

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Date:	Tue, 10 Jul 2012 16:45:58 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Ming Lei <tom.leiming@...il.com>
Cc:	Network Development <netdev@...r.kernel.org>,
	David Miller <davem@...emloft.net>
Subject: Re: TCP transmit performance regression

On Tue, 2012-07-10 at 22:22 +0800, Ming Lei wrote:

> Looks single page allocation won't put too much pressure on MM, that is
> why I suggested to avoid copy if the skb buffer size is less or equal one
> page. Anyway, unnecessary copy will increase computation and consume power.

AFAIK this long thread started with drivers/net/usb/smsc95xx.c using
32KB buffers, thats order-3 pages, not 'single page'

Definitely very wrong. You can try to claim the contrary, it wont be
wise.



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