linux-kernel - Re: x86 memcpy performance

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Message-ID: <CAHSGOuuova1kB77_X6bQ3R7E5N2PLhGsmxqb6kd48EDZ9yEPug@mail.gmail.com>
Date:	Tue, 16 Aug 2011 12:49:28 +0530
From:	melwyn lobo <linux.melwyn@...il.com>
To:	Borislav Petkov <bp@...en8.de>
Cc:	Denys Vlasenko <vda.linux@...glemail.com>,
	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	borislav.petkov@....com
Subject: Re: x86 memcpy performance

> Yes, on 32-bit you're using the compiler-supplied version
> __builtin_memcpy when CONFIG_KMEMCHECK=n and your gcc is of version 4
> and above. Reportedly, using __builtin_memcpy generates better code.
>
> Btw, my version of SSE memcpy is 64-bit only.
>
> --
> Regards/Gruss,
> Boris.
>
>

We would rather use the 32 bit patch. Have you already got a 32 bit
patch. How can I use sse3 for 32 bit.
I don't think you have submitted 64 bit patch in the mainline.
Is there still work ongoing on this.

Regards,
Melwyn
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