netdev - Re: TCP transmit performance regression

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Message-ID: <1341498529.2583.4155.camel@edumazet-glaptop>
Date:	Thu, 05 Jul 2012 16:28:49 +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 Thu, 2012-07-05 at 22:01 +0800, Ming Lei wrote:

> Basically, copy path will be bypassed since hard_header_len
> has included the 'overhead' already.

Unfortunately this is not done correctly.

needed_headroom should be set to SMSC95XX_TX_OVERHEAD_CSUM



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