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Date:   Fri, 23 Nov 2018 21:44:12 +0100 (CET)
From:   Thomas Gleixner <tglx@linutronix.de>
To:     hpa@zytor.com
cc:     Guenter Roeck <linux@roeck-us.net>, Borislav Petkov <bp@alien8.de>,
        X86 ML <x86@kernel.org>, LKML <linux-kernel@vger.kernel.org>,
        Andy Lutomirski <luto@kernel.org>,
        John Stultz <john.stultz@linaro.org>,
        Thomas Lendacky <Thomas.Lendacky@amd.com>
Subject: Re: [PATCH] x86/TSC: Use RDTSCP
In-Reply-To: <62E011F5-639B-4CF9-8A8B-091C84749F43@zytor.com>
Message-ID: <alpine.DEB.2.21.1811232143000.1684@nanos.tec.linutronix.de>
References: <20181119184556.11479-1-bp@alien8.de> <20181123200307.GA6223@roeck-us.net> <62E011F5-639B-4CF9-8A8B-091C84749F43@zytor.com>
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On Fri, 23 Nov 2018, hpa@zytor.com wrote:
> On November 23, 2018 12:03:07 PM PST, Guenter Roeck <linux@roeck-us.net> wrote:
> ># first bad commit: [2e94061096c5c3aa6c3fe3ec2bec176c1f9c1b07] x86/TSC:
> >Use RDTSCP
> 
> Right, because that cpu predates RDTSCP, so it needs to use a fallback.

Well, that's not the problem.

The default here is MFENCE; RDTSC; But P3 does not have MFENCE either :)

We need alternative_3 with default RDTSC

Thanks,

	tglx