netdev - Re: ipsec impact on performance

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Message-ID: <565E4881.2030002@cumulusnetworks.com>
Date:	Tue, 1 Dec 2015 17:25:21 -0800
From:	David Ahern <dsa@...ulusnetworks.com>
To:	Sowmini Varadhan <sowmini.varadhan@...cle.com>
Cc:	Rick Jones <rick.jones2@....com>, netdev@...r.kernel.org,
	linux-crypto@...r.kernel.org
Subject: Re: ipsec impact on performance

On 12/1/15 5:09 PM, Sowmini Varadhan wrote:
> The not-so-great news is that I see that just adding perf tracepoints
> (not even enabling them!) seems to make a small diff (3 Gbps vs 3.2 Gbps)
> to my numbers. Is that mere standard-deviation, or something
> one should be aware of, about perf?

existence of traepoints has no overhead until activated (ie., launch 
perf or start ftrace for those tracepoints).
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