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Message-ID: <20061011002656.GB30093@mellanox.co.il> Date: Wed, 11 Oct 2006 02:26:56 +0200 From: "Michael S. Tsirkin" <mst@...lanox.co.il> To: Roland Dreier <rdreier@...co.com> 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. Quoting r. Roland Dreier <rdreier@...co.com>: > Subject: Re: Dropping NETIF_F_SG since no checksum feature. > > Michael> Maybe I can patch linux to allow SG without checksum? > Michael> Dave, maybe you could drop a hint or two on whether this > Michael> is worthwhile and what are the issues that need > Michael> addressing to make this work? > > What do you really gain by allowing SG without checksum? Someone has > to do the checksum anyway, so I don't see that much difference between > doing it in the networking core before passing the data to/from the > driver, or down in the driver itself. My guess was, an extra pass over data is likely to be expensive - dirtying the cache if nothing else. But I do plan to measure that, and see. -- MST - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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