netdev - Re: [PATCH 0/3] x86_64, sfc: 128-bit memory-mapped I/O

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Message-ID: <50343810.2000809@zytor.com>
Date:	Tue, 21 Aug 2012 18:38:24 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Ben Hutchings <bhutchings@...arflare.com>
CC:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, netdev@...r.kernel.org,
	linux-net-drivers@...arflare.com, x86@...nel.org
Subject: Re: [PATCH 0/3] x86_64, sfc: 128-bit memory-mapped I/O

On 08/21/2012 06:17 PM, Ben Hutchings wrote:
> Current Solarflare network controllers have 128-bit memory-mapped
> registers which are normally accessed through a series of I/O
> operations.  However, it is also possible to access them with a single
> MOVAPS instruction on x86_64, and this is measurably faster as it
> requires only one PCIe transaction.

Also, have you considered doing this with write combining instead?

	-hpa

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