APPLIED(B, E, F): [PATCH 0/1][SRU][B][E][F][G][OEM-OSP1-B][OEM-5.6] Slow send speed with Intel I219-V on Ubuntu 18.04.1

[Kleber Souza]

On 2020-06-12 10:15, Timo Aaltonen wrote:
> On 5.6.2020 8.23, Khaled Elmously wrote:
>> On 2020-05-27 16:52:54 , AceLan Kao wrote:
>>> BugLink: https://bugs.launchpad.net/bugs/1802691
>>>
>>> [Impact]
>>> The throughput measured by iperf3 is around 70% of 1Gbps (Intel I219-LM
>>> [8086:15b7])
>>> I219 is a rather cheap NIC and it impacts its throughput if TSO(TCP
>>> segmentation offload) is enabled.
>>>
>>> [Fix]
>>> Disable TSO on NIC and move this task back to CPU fixes this issue.
>>> The impact of CPU loading is little to none.
>>> On target machine with Xeon(R) CPU E3-1505L v6 @ 2.20GHz(4c8t), the CPU
>>> usage of iperf3 increases from 1% to 4%
>>>
>>> [Verify]
>>> Origin
>>> [ ID] Interval Transfer Bandwidth Retr
>>> [ 4] 0.00-10.00 sec 918 MBytes 770 Mbits/sec 0 sender
>>> [ 4] 0.00-10.00 sec 916 MBytes 769 Mbits/sec receiver
>>>
>>> Becomes
>>> [ ID] Interval Transfer Bandwidth Retr
>>> [ 4] 0.00-10.00 sec 1.09 GBytes 936 Mbits/sec 0 sender
>>> [ 4] 0.00-10.00 sec 1.09 GBytes 934 Mbits/sec receiver
>>>
>>> [Regression Potential]
>>> Low, disable TSO on Ethernet chip will move the TCP segmentation task
>>> to CPU. This increase CPU loading a little bit, and should not introduce
>>> any regression.
>>>
>>> Kai-Heng Feng (1):
>>>   e1000e: Disable TSO for buffer overrun workaround
>>>
>>>  drivers/net/ethernet/intel/e1000e/netdev.c | 4 ++++
>>>  1 file changed, 4 insertions(+)
>>>
>>> -- 
>>> 2.25.1
>>>
> I can't find this applied on focal master-next?
> 
> 

Hi Timo,

It seems this patch wasn't really applied to focal/linux. Thanks for pointing
that out.

I have applied it now so it'll be picked up for the next (re-)spin.

Kleber