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

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Date:	Tue, 15 Dec 2015 19:39:24 +0100
From:	Borislav Petkov <bp@...en8.de>
To:	Dan Williams <dan.j.williams@...el.com>
Cc:	"Luck, Tony" <tony.luck@...el.com>, Ingo Molnar <mingo@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andy Lutomirski <luto@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Linux MM <linux-mm@...ck.org>,
	linux-nvdimm <linux-nvdimm@...1.01.org>, X86 ML <x86@...nel.org>
Subject: Re: [PATCHV2 3/3] x86, ras: Add mcsafe_memcpy() function to recover
 from machine checks

On Tue, Dec 15, 2015 at 10:35:49AM -0800, Dan Williams wrote:
> Correction we have MOVNTDQA, but that requires saving the fpu state
> and marking the memory as WC, i.e. probably not worth it.

Not really. Last time I tried an SSE3 memcpy in the kernel like glibc
does, it wasn't worth it. The enhanced REP; MOVSB is hands down faster.

-- 
Regards/Gruss,
    Boris.

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