Heya folks, Ned here again. There is a performance reduction in 22H2 when copying larger files from a remote computer down to a Windows 11 computer or when copying from any Windows computer to a remo...
Updated Mar 06, 2023
Version 10.0
Blog Post
No, no changes in settings. Also we don't blindly apply any tweaks or run run of the mill tools available online. We're a low level software engineering company, we don't just try random things 🙂 I even suggested a few posts back to others not to do so as well. We tune everything by hand, as required after collecting performance metrics, and our network setup has not changed at all since our initial deployment of current network configuration.
The issue we still see is very specific to Multichannel SMB. Without multichannel the performance is as expected now, as I already reported. With multichannel we used to get average 1.8-2Gb/s on the workstations utilizing dual 10Gbps SFP+ links of Intel X710 adapters. Now we see half of that performance as with multichannel disabled, plus the speed ramping issue when traffic is from client to server. (We do not use RDMA).
If we disable Multichannel we can saturate a single link just fine (after the latest updates) with no ramping issue as well but obviously that won't do, otherwise we would not have designed our network as we have.
We use microsoft's own tool for troubleshooting: https://github.com/microsoft/diskspd as is suggested here: https://learn.microsoft.com/en-us/azure/storage/files/storage-files-smb-multichannel-performance