netdev - Re: DSA and ptp_classify_raw: saving some CPU cycles causes worse throughput?

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Message-ID: <20201104131025.3f52b939@kicinski-fedora-pc1c0hjn.dhcp.thefacebook.com>
Date:   Wed, 4 Nov 2020 13:10:25 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Vladimir Oltean <olteanv@...il.com>
Cc:     netdev@...r.kernel.org
Subject: Re: DSA and ptp_classify_raw: saving some CPU cycles causes worse
 throughput?

On Wed, 4 Nov 2020 03:58:34 +0200 Vladimir Oltean wrote:
> The only problem?
> Throughput is actually a few Mbps worse, and this is 100% reproducible,
> doesn't appear to be measurement error.

Is there any performance scaling enabled? IOW CPU freq can vary?