linux-kernel - Re: [PATCH v6 1/3] x86/fpu: Measure the Latency of XSAVES and XRSTORS

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Message-ID: <08dd36d0-08e1-cf55-355e-5c21132c44fb@intel.com>
Date:   Wed, 6 Sep 2023 11:49:40 -0700
From:   Dave Hansen <dave.hansen@...el.com>
To:     Yi Sun <yi.sun@...el.com>, Andi Kleen <ak@...ux.intel.com>
Cc:     Ingo Molnar <mingo@...nel.org>, tglx@...utronix.de,
        linux-kernel@...r.kernel.org, x86@...nel.org,
        sohil.mehta@...el.com, ilpo.jarvinen@...ux.intel.com,
        heng.su@...el.com, tony.luck@...el.com,
        dave.hansen@...ux.intel.com, yi.sun@...el.intel.com
Subject: Re: [PATCH v6 1/3] x86/fpu: Measure the Latency of XSAVES and XRSTORS

On 9/6/23 02:18, Yi Sun wrote:
> Or just use PT

I'd really like to be able to use this mechanism across a wide range of
systems over time and vendors.  For instance, if Intel's AVX512 XSAVE
implementation is much faster than AMD's, it would be nice to show some
apples-to-apples data to motivate AMD to do better.  We can't do that
with PT.