linux-kernel - Re: Dropping NETIF_F_SG since no checksum feature.

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Date:	Wed, 11 Oct 2006 02:20:15 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	mst@...lanox.co.il
Cc:	shemminger@...l.org, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org, openib-general@...nib.org,
	rolandd@...co.com
Subject: Re: Dropping NETIF_F_SG since no checksum feature.

From: "Michael S. Tsirkin" <mst@...lanox.co.il>
Date: Wed, 11 Oct 2006 11:05:04 +0200

> So, it seems that if I set NETIF_F_SG but clear NETIF_F_ALL_CSUM,
> data will be copied over rather than sent directly.
> So why does dev.c have to force set NETIF_F_SG to off then?

Because it's more efficient to copy into a linear destination
buffer of an SKB than page sub-chunks when doing checksum+copy.
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