linux-kernel - Re: [PATCH 0/2] Speed MTRR programming up when we can

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Message-ID: <alpine.DEB.2.21.1906272238460.32342@nanos.tec.linutronix.de>
Date:   Thu, 27 Jun 2019 22:39:13 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Ricardo Neri <ricardo.neri-calderon@...ux.intel.com>
cc:     Ingo Molnar <mingo@...nel.org>, Borislav Petkov <bp@...e.de>,
        Alan Cox <alan.cox@...el.com>, Tony Luck <tony.luck@...el.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Andi Kleen <andi.kleen@...el.com>,
        Hans de Goede <hdegoede@...hat.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jordan Borgner <mail@...dan-borgner.de>,
        "Ravi V. Shankar" <ravi.v.shankar@...el.com>,
        Mohammad Etemadi <mohammad.etemadi@...el.com>,
        Ricardo Neri <ricardo.neri@...el.com>,
        linux-kernel@...r.kernel.org, x86@...nel.org
Subject: Re: [PATCH 0/2] Speed MTRR programming up when we can

On Thu, 27 Jun 2019, Ricardo Neri wrote:
> By measuring the execution time of mtrr_aps_init() (from which MTRRs
> in all CPUs are programmed in lock-step at boot), I find savings in the
> time required to program MTRRs as follows:
> 
> Platform                      time-with-wbinvd(ms) time-no-wbinvd(ms)
> 104-core (208 LP) Skylake            1437                 28
> 2-core (4 LP) Haswell                 114                  2

Impressive!