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Message-ID: <yw1xsi4coc58.fsf@unicorn.mansr.com> Date: Wed, 11 Nov 2015 14:15:31 +0000 From: Måns Rullgård <mans@...sr.com> To: Eric Dumazet <eric.dumazet@...il.com> Cc: David Miller <davem@...emloft.net>, romieu@...zoreil.com, linux-kernel@...r.kernel.org, netdev@...r.kernel.org, slash.tmp@...e.fr Subject: Re: [PATCH v5] net: ethernet: add driver for Aurora VLSI NB8800 Ethernet controller Eric Dumazet <eric.dumazet@...il.com> writes: > On Wed, 2015-11-11 at 13:48 +0000, Måns Rullgård wrote: >> Eric Dumazet <eric.dumazet@...il.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@...sr.com -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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