Date: Tue, 15 Dec 2015 20:28:37 +0100
From: Borislav Petkov <bp@alien8.de>
To: "Elliott, Robert (Persistent Memory)" <elliott@hpe.com>
Cc: Dan Williams <dan.j.williams@intel.com>,
        "Luck, Tony" <tony.luck@intel.com>,
        linux-nvdimm <linux-nvdimm@ml01.01.org>, X86 ML <x86@kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        Linux MM <linux-mm@kvack.org>, Andy Lutomirski <luto@kernel.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        Ingo Molnar <mingo@kernel.org>
Subject: Re: [PATCHV2 3/3] x86, ras: Add mcsafe_memcpy() function to recover
 from machine checks
Message-ID: <20151215192837.GL25973@pd.tnic>
References: <cover.1449861203.git.tony.luck@intel.com>
 <23b2515da9d06b198044ad83ca0a15ba38c24e6e.1449861203.git.tony.luck@intel.com>
 <20151215131135.GE25973@pd.tnic>
 <CAPcyv4gMr6LcZqjxt6fAoEiaa0AzcgMxnp2+V=TWJ1eHb6nC3A@mail.gmail.com>
 <3908561D78D1C84285E8C5FCA982C28F39F8566E@ORSMSX114.amr.corp.intel.com>
 <CAPcyv4icSmdnvQhsdzfP3uZYXJ2vsjrZxMQjSghNOt19u++o7g@mail.gmail.com>
 <CAPcyv4gMku=rAczAz2b4PaW6qwm9LAVU8BG3hcT_A4QMAkZfbA@mail.gmail.com>
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On Tue, Dec 15, 2015 at 07:19:58PM +0000, Elliott, Robert (Persistent Memory) wrote:

...

> Due to the historic long latency of storage devices,
> applications don't re-read from storage again; they
> save the results.
> So, the streaming-load instructions are beneficial:

That's the theory...

Do you also have some actual performance numbers where non-temporal
operations are better than the REP; MOVSB and *actually* show
improvements? And no microbenchmarks please.

Thanks.

-- 
Regards/Gruss,
    Boris.

ECO tip #101: Trim your mails when you reply.
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