APPLIED [OEM-5.6] Re: [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 27.5.2020 11.52, 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(+)
> 

applied to oem-5.6-next, thanks

-- 
t