Questions on LRO and Delayed ACK

Hi All,


1.       If there is hardware support for LRO, (where the hardware delivers coalesces a bunch of consecutive TCP segments into one large TCP Segment), is it enough for the driver to simply post the segment to the host stack via ifp->if_input() ? I mean is there a need to run thru tcp_lro_rx() followed by tcp_lro_flush().



2.       What kind performance improvement does one get using soft lro via tcp_lro_init(); tcp_lro_rx();tcp_lro_flush();


3.       In the absence of LRO, is there any way that one can increase the number of inbound frames for which an ACK is transmitted to a value greater than 2?

Thanks
david S.

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