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Re: Packet Number Encryption Performance

Rui Paulo <rpaulo@apple.com> Mon, 25 June 2018 17:52 UTC

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Subject: Re: Packet Number Encryption Performance
From: Rui Paulo <rpaulo@apple.com>
In-reply-to: <CANatvzzpZTh516VB40gHiMZq5oOjNRMPpNouCRd-WosEcKaisA@mail.gmail.com>
Date: Mon, 25 Jun 2018 10:52:39 -0700
Cc: Ian Swett <ianswett@google.com>, Praveen Balasubramanian <pravb@microsoft.com>, Nick Banks <nibanks=40microsoft.com@dmarc.ietf.org>, IETF QUIC WG <quic@ietf.org>
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To: Kazuho Oku <kazuhooku@gmail.com>
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On Jun 22, 2018, at 17:01, Kazuho Oku <kazuhooku@gmail.com> wrote:
> 
> This is because IIUC PNE is a marginal additional use of the AES-NI engine, which have been mostly idle. The overhead of crypto is small (i.e. 15%) that we will rarely see contention on the engine. While one hyperthread does AES, the other hyperthread will run at full speed doing other operations.
> 
> Also considering the fact that the number of CPU cycles spent per QUIC packet does not change a lot with PNE, I would not be surprised to see *no* decrease of throughput when PNE is used on a HyperThreading architecture. In such case, what we will only observe is the raise of the utilization ratio of the AES-NI engine.

I don’t disagree but this is a very brand/model specific claim and we can’t assume the cost of PNE will be reasonable everywhere.

—
Rui Paulo

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