Messages in this thread | | | From | "Joakim Tjernlund" <> | Subject | Re: NETIF_F_SG question | Date | Sat, 1 Feb 2003 19:42:01 +0100 |
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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
linearize = copy small buffers inte one big buffer, or? Surley the copy operation will cost something?
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