linux-kernel - Re: [PATCHV2 3/3] x86, ras: Add mcsafe_memcpy() function to recover from machine checks

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Message-ID: <20151215192837.GL25973@pd.tnic>
Date:	Tue, 15 Dec 2015 20:28:37 +0100
From:	Borislav Petkov <bp@...en8.de>
To:	"Elliott, Robert (Persistent Memory)" <elliott@....com>
Cc:	Dan Williams <dan.j.williams@...el.com>,
	"Luck, Tony" <tony.luck@...el.com>,
	linux-nvdimm <linux-nvdimm@...1.01.org>, X86 ML <x86@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Linux MM <linux-mm@...ck.org>,
	Andy Lutomirski <luto@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...nel.org>
Subject: Re: [PATCHV2 3/3] x86, ras: Add mcsafe_memcpy() function to recover
 from machine checks

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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