netdev - Re: NIU - Sun Neptune 10g - Transmit timed out reset (2.6.24)

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Message-Id: <20080522.112824.103189026.davem@davemloft.net>
Date:	Thu, 22 May 2008 11:28:24 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	bhutchings@...arflare.com
Cc:	jesper@...gh.cc, Matheos.Worku@....COM, yhlu.kernel@...il.com,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: NIU - Sun Neptune 10g - Transmit timed out reset (2.6.24)

From: Ben Hutchings <bhutchings@...arflare.com>
Date: Thu, 22 May 2008 19:14:21 +0100

> David Miller wrote:
> > For now, yes.  The transmit path itself in the generic network
> > device layer is where the serialization comes from.
> 
> This is true in the general case, but can be substantially mitigated
> by segmentation offload.  Unfortunately GSO doesn't help much as the
> overhead of allocating the extra skbs is fairly high.

But GSO still does help a lot for chips that lack hw TSO support,
such as NIU, therefore sw GSO support in the NIU driver was pretty
high on my todo list.
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