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Date:   Thu, 15 Feb 2018 09:38:50 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Matt Fleming <matt@...eblueprint.co.uk>
Cc:     Jon Maloy <jon.maloy@...csson.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "mingo@...nel.org" <mingo@...nel.org>,
        "David Miller (davem@...emloft.net)" <davem@...emloft.net>,
        Mike Galbraith <umgwanakikbuti@...il.com>
Subject: Re: Serious performance degradation in Linux 4.15

On Wed, Feb 14, 2018 at 10:46:20PM +0000, Matt Fleming wrote:
> Here's some more numbers. This is with RETPOLINE=y but you'll see it
> doesn't make much of a difference. Oh, this is also with powersave
> cpufreq governor.

Hurmph, I'll go have a look when I can boot tip/master again :/

But didn't you bench those patches before we merged them? I can't
remember you reporting this..

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