netdev - Re: [PATCH 2/3] x86_64: Define 128-bit memory-mapped I/O operations

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Message-ID: <CA+55aFxoWLad9vtfAzQ7qXWcspL92D5s5+MFJ-HfyH3LVqfpaA@mail.gmail.com>
Date:	Wed, 22 Aug 2012 07:50:52 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Ben Hutchings <bhutchings@...arflare.com>
Cc:	"H. Peter Anvin" <hpa@...or.com>,
	David Miller <davem@...emloft.net>, tglx@...utronix.de,
	mingo@...hat.com, netdev@...r.kernel.org,
	linux-net-drivers@...arflare.com, x86@...nel.org
Subject: Re: [PATCH 2/3] x86_64: Define 128-bit memory-mapped I/O operations

On Wed, Aug 22, 2012 at 7:24 AM, Ben Hutchings
<bhutchings@...arflare.com> wrote:
>
> Sorry, I'll paste it below.

The thing you pasted isn't actually the thing in the subject line.
It's just you *using* it.

I wanted to see what that "writeo()" looks like for x86-64.

But I got google to find it for me by looking for "__raw_writeo", so I
can see the patch now. It looks like it might work. Does it really
help performance despite always doing those TS games in CR0 for each
access?

                 Linus
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