netdev - Re: [PATCH net-next 3/3] net: allow to leave the buffer fragmented in skb_cow

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Message-ID: <1383661995.4291.137.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Tue, 05 Nov 2013 06:33:15 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Mathias Krause <mathias.krause@...unet.com>
Cc:	"David S. Miller" <davem@...emloft.net>,
	Steffen Klassert <steffen.klassert@...unet.com>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	Dmitry Tarnyagin <dmitry.tarnyagin@...kless.no>,
	netdev@...r.kernel.org
Subject: Re: [PATCH net-next 3/3] net: allow to leave the buffer fragmented
 in skb_cow_data()

On Tue, 2013-11-05 at 14:54 +0100, Mathias Krause wrote:
> Do not linearize the buffer per se but only if we're expected to expand
> the tail. All callers can handle fragmented buffers and even expect
> them!
> 
> Not linearizing the buffer leads to a small performance improvement for
> the IPsec receive path in case the network driver passed us a fragmented
> buffer.
> 
> With this patch applied I was able to increase the throughput of an
> IPsec gateway from 7.12 Gbit/s to 7.28 Gbit/s.

What is the driver you used ?


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