linux-kernel - Re: [PATCH] x86: Optimise x86 IP checksum code

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Message-ID: <20191204091450.GQ2844@hirez.programming.kicks-ass.net>
Date:   Wed, 4 Dec 2019 10:14:50 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     David Laight <David.Laight@...LAB.COM>
Cc:     linux-kernel <linux-kernel@...r.kernel.org>,
        "x86@...nel.org" <x86@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH] x86: Optimise x86 IP checksum code

On Tue, Dec 03, 2019 at 11:52:09AM +0000, David Laight wrote:

> I did get about 12 bytes/clock using adox/adcx but that would need run-time
> patching and some AMD cpu that support the instructions run them very slowly.

Isn't that was we have alternative_call() for?