lkml.org 
[lkml]   [2015]   [Nov]   [11]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
SubjectRe: [PATCH v5] net: ethernet: add driver for Aurora VLSI NB8800 Ethernet controller
Date
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


\
 
 \ /
  Last update: 2015-11-11 15:41    [W:0.650 / U:0.036 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site