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

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Date:	Thu, 16 Jan 2014 09:14:00 +0000
From:	David Laight <David.Laight@...LAB.COM>
To:	'Willy Tarreau' <w@....eu>,
	"davem@...emloft.net" <davem@...emloft.net>
CC:	"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

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?

	David



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