netdev - RE: ipsec impact on performance

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Date:	Wed, 2 Dec 2015 11:56:45 +0000
From:	David Laight <David.Laight@...LAB.COM>
To:	'Sowmini Varadhan' <sowmini.varadhan@...cle.com>,
	Tom Herbert <tom@...bertland.com>
CC:	Linux Kernel Network Developers <netdev@...r.kernel.org>,
	"linux-crypto@...r.kernel.org" <linux-crypto@...r.kernel.org>
Subject: RE: ipsec impact on performance

From: Sowmini Varadhan
> Sent: 01 December 2015 18:37
...
> I was using esp-null merely to not have the crypto itself perturb
> the numbers (i.e., just focus on the s/w overhead for now), but here
> are the numbers for the stock linux kernel stack
>                 Gbps  peak cpu util
> esp-null         1.8   71%
> aes-gcm-c-256    1.6   79%
> aes-ccm-a-128    0.7   96%
> 
> That trend made me think that if we can get esp-null to be as close
> as possible to GSO/GRO, the rest will follow closely behind.

That's not how I read those figures.
They imply to me that there is a massive cost for the actual encryption
(particularly for aes-ccm-a-128) - so whatever you do to the esp-null
case won't help.

One way to get a view of the cost of the encryption (and copies)
is to do the operation twice.

	David

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