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

[Timo Aaltonen]

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?


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