Low Infiniband FDR performance seen on Windows server 2016

asked 2021-11-16T04:36:51.723+00:00
Tetsu Shinto 1 Reputation point

We are using Windows OS with FDR card.
When the performance was measured by the nd_send_xxx test, the performance was only about 33 Gbps compared to the spec performance of 56 Gbps.
We have seen that about 50 Gbps can be achieved when running on Linux OS.
Please see details on the test below.

<Test setup>
Server: Fujitsu PRIMEQUEST 
HCA driver: WinOF5.25 
Firmware: FWv2.36.500
Switch: MSB7800
OS version: windows server2016 Datacenter ver.10.0.14393
Test Commands:
start /b /affinity 0x1 nd_send_bw -a -n 1000 -S
start /b /affinity 0x1 nd_read_bw -a -n 1000 -S
start /b /affinity 0x1 nd_write_bw -a -n 1000 -S

qp #bytes #iterations MR [Mmps] Gb/s CPU Util.

nd_send_bw 0 8388608 1000 0.000 33.53 99.93
nd_read_bw 0 8388608 1000 0.000 33.13 100.00
nd_write_bw 0 8388608 1000 0.000 33.46 99.70

We also did loopback test, and got the results of only 33Gb/s too,
In the loopback test, the traffic is not sent out to the switch, but is looped back to the host
So we think the bottleneck of the performance is in the Windows ND stack.

Please advise how to improve the performance of Windows ND stack.

Windows Server
Windows Server
A family of Microsoft server operating systems that support enterprise-level management, data storage, applications, and communications.
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