Messages in this thread | | | From | David Laight <> | Subject | RE: [PATCH net-next 08/12] r8152: support TSO | Date | Tue, 4 Mar 2014 15:14:01 +0000 |
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From: Eric Dumazet > On Tue, 2014-03-04 at 14:35 +0000, David Laight wrote: > > > Does that mean you are splitting the 64k 'ethernet packet' from TCP > > is software? I've looked at the ax88179 where the hardware can do it. > > > > Is there really a gain doing segmentation here if you have to do the > > extra data copy? > > There is no 'extra' copy. > > There is _already_ a copy, so what's the deal of doing this copy in a SG > enabled way ?
Ok.
But there is one more copy than for a normal ethernet chipset which can use multiple ring entries to send the MAC+IP+TCP headers from a different buffer to the TCP userdata.
David
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