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Re: [PATCH] Ethernet Bridging: Enable Hardware Checksumming

To: Nivedita Singhvi <niv@xxxxxxxxxx>
Subject: Re: [PATCH] Ethernet Bridging: Enable Hardware Checksumming
From: Stephen Hemminger <shemminger@xxxxxxxx>
Date: Thu, 19 May 2005 13:34:37 -0700
Cc: "David S. Miller" <davem@xxxxxxxxxxxxx>, jdmason@xxxxxxxxxx, netdev@xxxxxxxxxxx
In-reply-to: <428CAD24.904@xxxxxxxxxx>
Organization: Open Source Development Lab
References: <20050518235329.GA17946@xxxxxxxxxx> <428BD7E7.5080207@xxxxxxxxxx> <20050518.220031.75189050.davem@xxxxxxxxxxxxx> <428CAD24.904@xxxxxxxxxx>
Sender: netdev-bounce@xxxxxxxxxxx
On Thu, 19 May 2005 08:13:40 -0700
Nivedita Singhvi <niv@xxxxxxxxxx> wrote:

> David S. Miller wrote:
> 
> >>I think this is a good thing to have, gives us performance
> >>gain (equivalent to using/not using checksum offload) and
> >>has very little impact on the bridging layer, and is
> >>independent of the virtualization stuff..
> > 
> > 
> > I agree but keep in mind that when bridging over non-checksumming
> > devices it will be more expensive.  Especially for TCP.
> 
> Yep - as I just said to Herbert - perhaps worthwhile then
> conditional upon support of checksum offload & SG?

What about mixed device bridges? 

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