Messages in this thread | ![/](/images/icornerl.gif) | | Date | Sat, 01 Feb 2003 12:40:20 -0500 | From | Jeff Garzik <> | Subject | Re: NETIF_F_SG question |
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Joakim Tjernlund wrote: > I am thinking of implementing harware scatter/gatter support( NETIF_F_SG) in my > ethernet driver. The network device cannot do HW checksuming. > > Will the IP stack make use of the SG support and will there be any significant performance > improvement?
No; you need HW checksumming for NETIF_F_SG to be useful.
If HW checksumming is not available, scatter-gather is useless, because the net stack must always make a pass over the data to checksum it. Since it must do that, it can linearize the skb at the same time, eliminating the need for SG.
Jeff
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