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

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Message-ID: <adar6xfbk6d.fsf@cisco.com>
Date:	Tue, 10 Oct 2006 20:33:46 -0700
From:	Roland Dreier <rdreier@...co.com>
To:	"Michael S. Tsirkin" <mst@...lanox.co.il>
Cc:	Stephen Hemminger <shemminger@...l.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	netdev@...r.kernel.org, openib-general@...nib.org,
	Roland Dreier <rolandd@...co.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: Re: Dropping NETIF_F_SG since no checksum feature.

    Michael> My guess was, an extra pass over data is likely to be
    Michael> expensive - dirtying the cache if nothing else. But I do
    Michael> plan to measure that, and see.

I don't get it -- where's the extra pass?  If you can't compute the
checksum on the NIC then you have to compute sometime it on the CPU
before passing the data to the NIC.

 - R.
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