netdev - Re: ipsec impact on performance

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Message-ID: <20151202211201.GD15262@oracle.com>
Date:	Wed, 2 Dec 2015 16:12:01 -0500
From:	Sowmini Varadhan <sowmini.varadhan@...cle.com>
To:	Tom Herbert <tom@...bertland.com>
Cc:	David Laight <David.Laight@...lab.com>,
	Linux Kernel Network Developers <netdev@...r.kernel.org>,
	"linux-crypto@...r.kernel.org" <linux-crypto@...r.kernel.org>,
	Rick Jones <rick.jones2@....com>
Subject: Re: ipsec impact on performance

On (12/02/15 13:07), Tom Herbert wrote:
> That's easy enough to add to flow dissector, but is SPI really
> intended to be used an L4 entropy value? We would need to consider the

yes. To quote https://en.wikipedia.org/wiki/Security_Parameter_Index
"This works like port numbers in TCP and UDP connections. What it means
 is that there could be different SAs used to provide security to one
 connection. An SA could therefore act as a set of rules."

> effects of running multiple TCP connections over an IPsec. Also, you
> might want to try IPv6, the flow label should provide a good L4 hash
> for RPS/RFS, it would be interesting to see what the effects are with
> IPsec processing. (ESP/UDP could also if RSS/ECMP is critical)

IPv6 would be an interesting academic exercise, but it's going
to be a while before we get RDS-TCP to go over IPv6.

--Sowmini

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