netdev - Re: [PATCH 11/13] net: mvneta: implement rx

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Date:	Thu, 16 Jan 2014 10:36:40 +0100
From:	Willy Tarreau <w@....eu>
To:	David Laight <David.Laight@...LAB.COM>
Cc:	"davem@...emloft.net" <davem@...emloft.net>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
	Gregory CLEMENT <gregory.clement@...e-electrons.com>
Subject: Re: [PATCH 11/13] net: mvneta: implement rx_copybreak

On Thu, Jan 16, 2014 at 09:14:00AM +0000, David Laight wrote:
> From: Of Willy Tarreau
> > calling dma_map_single()/dma_unmap_single() is quite expensive compared
> > to copying a small packet. So let's copy short frames and keep the buffers
> > mapped. We set the limit to 256 bytes which seems to give good results both
> > on the XP-GP board and on the AX3/4.
> 
> Have you tried something similar for transmits?
> Copying short tx into a preallocated memory area that is dma_mapped
> at driver initialisation?

Not yet by lack of time, but I intend to do so. Both the NIC and the driver
are capable of running at line rate (1.488 Mpps) when filling descriptors
directly, so many improvements are still possible.

Regards,
Willy

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