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Daily Archives: January 22, 2021

  • Slow file copy

    Posted on January 22nd, 2021 at 22:32 Comment on the AskWoody Lounge

    I’m setting up a new Server 2019 with HyperV and I’m reminded of something I did on the LAST Server 2019 that I set up.

    I disable RSS on the server  by typing into PowerShell the following command:  netsh int tcp set global RSS=Disabled

    And then Disable-NetAdapterRsc -Name (and then you put in the name of your Ethernet connection)

    Now for that second command you need to make it easy on yourself by renaming the name of the Ethernet connection so you don’t have to type a huge line into the command. When I went googling for the exact command I realized that while I don’t do this command on my workstations, I DO indeed do this command on my servers. There is a detailed write up on this blog about this command and it walks you through the process of identifying if your network connection is impacted by RSC.

    So what is RSC?  A technology that is SUPPOSED to make things better/faster.  I’ve found that at least when your server is supposed to do file sharing, it does better when it’s off.

    The underlying issue (as I understand it) comes down to drivers. For me, I needed to turn this off. On desktops running the latest Windows 10 and reasonably up to date drivers I have not needed to use this command to impact wifi  speed on my workstations.