Messages in this thread | | | Date | Wed, 11 Oct 2006 02:26:56 +0200 | From | "Michael S. Tsirkin" <> | Subject | Re: Dropping NETIF_F_SG since no checksum feature. |
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Quoting r. Roland Dreier <rdreier@cisco.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.
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