Messages in this thread | | | From | Måns Rullgård <> | Subject | Re: [PATCH v5] net: ethernet: add driver for Aurora VLSI NB8800 Ethernet controller | Date | Wed, 11 Nov 2015 14:15:31 +0000 |
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Eric Dumazet <eric.dumazet@gmail.com> writes:
> On Wed, 2015-11-11 at 13:48 +0000, Måns Rullgård wrote: >> Eric Dumazet <eric.dumazet@gmail.com> writes: >> >> > On Wed, 2015-11-11 at 13:04 +0000, Måns Rullgård wrote: >> > >> >> I tried that, and throughput (as measured by iperf3) dropped by 2%. >> >> Maybe I did something wrong. >> > >> > What link speed have you used, what was the throughput you got, >> > and is the receiver using the same NIC ? >> >> 1Gbps link, 640 Mbps TCP transmit throughput to a PC with Intel NIC. >> Why does it matter what NIC the receiver has? > > Because at 1Gb line rate, you better get GRO properly implemented in the > receiver, so that TCP stack does not send one ACK every 2 MSS. > > Send speed is also dependent on the number of ACK packets the sender has > to process. > > This is why I suggested you use napi_gro_receive() in your driver.
FWIW, with UDP I get 650 Mbps.
-- Måns Rullgård mans@mansr.com
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