Messages in this thread | | | Date | Tue, 27 Jan 2009 10:42:10 -0800 (PST) | Subject | Re: [PATCH v2] tcp: splice as many packets as possible at once | From | David Miller <> |
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From: David Miller <davem@davemloft.net> Date: Mon, 26 Jan 2009 22:10:56 -0800 (PST)
> Even for drivers like NIU and myri10ge that do this, they only > use heuristics or some fixed minimum to decide how much to > move to the linear area. > > Result? Some data payload bits end up there because it overshoots. ... > I did test this with the NIU driver at one point, and it did not > change TCP latency nor throughput at all even at 10g speeds.
As a followup, it turns out that NIU right now does this properly.
It only pulls a maximum of ETH_HLEN into the linear area before giving the SKB to netif_receive_skb().
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