Eric Dumazet <eric.duma...@gmail.com> writes: > On Wed, 2015-11-11 at 13:48 +0000, Måns Rullgård wrote: >> Eric Dumazet <eric.duma...@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 m...@mansr.com -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
