linux-kernel - Re: [PATCH] x86: Accelerate copy

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Message-ID: <7854092f-f37a-f95c-132a-1b2896d582fc@huawei.com>
Date:   Wed, 14 Apr 2021 13:25:20 +0800
From:   Kemeng Shi <shikemeng@...wei.com>
To:     Borislav Petkov <bp@...en8.de>
CC:     <tglx@...utronix.de>, <mingo@...hat.com>, <x86@...nel.org>,
        <hpa@...or.com>, <linux-kernel@...r.kernel.org>,
        <linux-nvdimm@...ts.01.org>
Subject: Re: [PATCH] x86: Accelerate copy_page with non-temporal in X86



on 2021/4/13 22:53, Borislav Petkov wrote:
> I thought "should be better" too last time when I measured rep; movs vs
> NT stores but actual measurements showed no real difference.
Mabye the NT stores make difference when store to slow dimms, like the
persistent memory I just tested. Also, it likely reduces unnecessary cache
load and flush, and benifits the running processes which have data cached.

-- 
Best wishes
Kemeng Shi