netdev - Re: Regarding tx-nocache-copy in the Sheevaplug

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Message-ID: <20141013154807.GN1972@vicerveza.homeunix.net>
Date:	Mon, 13 Oct 2014 17:48:07 +0200
From:	Lluís Batlle i Rossell <viric@...ic.name>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Ezequiel Garcia <ezequiel.garcia@...e-electrons.com>,
	Andrew Lunn <andrew@...n.ch>, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org,
	Carles Pagès <page@...ata.homelinux.net>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: Regarding tx-nocache-copy in the Sheevaplug

On Mon, Oct 13, 2014 at 07:49:19AM -0700, Eric Dumazet wrote:
> On Mon, 2014-10-13 at 16:31 +0200, Lluís Batlle i Rossell wrote:
> > Enabling tx offload and disabling tx-nocache-copy, making the machine *send* a
> > lot of ssh traffic (sftp for example) makes ssh fail HMAC. It's quite easy to
> > reproduce here.
> > 
> > As for the hardware, it's an old sheevaplug board.
> 
> 
> Have you tried disabling TSO only, and are you using the latest kernel ?
> 
> Ezequiel Garcia added lot of changes recently.
> 
> 

Is TSO TCP segmentation offload? It's disabled. The kernel is 3.16.3 (debian).
https://packages.debian.org/testing/kernel/linux-image-3.16-2-kirkwood

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