netdev - Re: sit tunnel slow since added GSO/TSO support

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Date:	Fri, 13 Dec 2013 08:28:44 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Michal Schmidt <mschmidt@...hat.com>
Cc:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	Eric Dumazet <edumazet@...gle.com>
Subject: Re: sit tunnel slow since added GSO/TSO support

On Fri, 2013-12-13 at 17:13 +0100, Michal Schmidt wrote:
> Hello,
> 
> I've been experimenting with IPIP and SIT tunnels. Both of them
> had the support for GSO/TSO added recently, by commits:
>   cb32f511a7 "ipip: add GSO/TSO support"
>   61c1db7fae "ipv6: sit: add GSO/TSO support"
> 
> IPIP works fine for me.
> 
> I am seeing very low TCP performance with SIT if TSO is enabled on the
> SIT interface. It does not matter if the underlying hardware supports
> NETIF_F_GSO_SIT or not (I have tested with bnx2x and tg3).

Strange, my tests were done on bnx2x, and TSO was definitely working ...

I'll take a look, thanks !


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