netdev - Re: using software TSO on non-TSO capable netdevices

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Message-ID: <20080731132735.GA9085@gondor.apana.org.au>
Date:	Thu, 31 Jul 2008 21:27:35 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Ben Hutchings <bhutchings@...arflare.com>
Cc:	David Miller <davem@...emloft.net>, buytenh@...tstofly.org,
	netdev@...r.kernel.org, akarkare@...vell.com, nico@....org,
	dale@...nsworth.org
Subject: Re: using software TSO on non-TSO capable netdevices

On Thu, Jul 31, 2008 at 02:19:30PM +0100, Ben Hutchings wrote:
>
> You might want to think about providing a way for soft-GSO to generate
> more lightweight structures than skbs.  The overhead for skb allocation
> becomes quite significant beyond 1 Gbit/s, which is why we added the soft-
> TSO implementation in sfc using per-interface pools of header buffers.  I
> would guess niu would benefit from this sort of approach, though it looks
> like all the other 10G NICs do TSO in hardware/firmware.

We could always provide a library that makes it easier for the
drivers to do TSO in software without allocating skb's.

Cheers,
-- 
Visit Openswan at http://www.openswan.org/
Email: Herbert Xu ~{PmV>HI~} <herbert@...dor.apana.org.au>
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