netdev - Re: [PATCH v5] net: ethernet: add driver for Aurora VLSI NB8800 Ethernet controller

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Date:	Wed, 11 Nov 2015 06:44:34 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Måns Rullgård <mans@...sr.com>
Cc:	David Miller <davem@...emloft.net>, romieu@...zoreil.com,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	slash.tmp@...e.fr
Subject: Re: [PATCH v5] net: ethernet: add driver for Aurora VLSI NB8800
 Ethernet controller

On Wed, 2015-11-11 at 14:35 +0000, Måns Rullgård wrote:

> It seems the on-chip interconnect is limiting memory bandwidth available
> to the Ethernet DMA.  If I increase the limits, I get 800 Mbps over TCP
> and 850 Mbps over UDP with the driver posted here, the TCP case being
> CPU bound in csum_partial_copy_from_user.

Ah right, NIC has no TX checksum offload :(



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