netdev - Re: Stable regression with 'tcp: allow splice() to build full TSO packets'

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Message-ID: <1337279905.2496.23.camel@bwh-desktop.uk.solarflarecom.com>
Date:	Thu, 17 May 2012 19:38:25 +0100
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	Willy Tarreau <w@....eu>
CC:	Eric Dumazet <eric.dumazet@...il.com>, <netdev@...r.kernel.org>
Subject: Re: Stable regression with 'tcp: allow splice() to build full TSO
 packets'

On Thu, 2012-05-17 at 17:56 +0200, Willy Tarreau wrote:
[...]
> The NIC does not support TSO but I've seen an alternate driver for this
> NIC which pretends to do TSO and in fact builds header frags so that the
> NIC is able to send all frames at once. I think it's already what GSO is
> doing but I'm wondering whether it would be possible to get more speed
> by doing this than by relying on GSO to (possibly) split the frags earlier.
[...]

Yes, GSO has some overhead for skb allocation and additional function
calls that you can avoid by doing 'TSO' in the driver.

Ben.

-- 
Ben Hutchings, Staff Engineer, Solarflare
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.

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