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    Slow WAN speed on upgrade 2.6.0

    Scheduled Pinned Locked Moved Virtualization
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    • L
      lifeasben
      last edited by

      I'm having the same issue on Windows Server 2019 (1809, 17763.2366). I tried the tip to uncheck "Enable virtual machine queue" on both WAN and LAN ports, but this didn't help at all.
      Since I wanted the ZFS storage, I had started with a clean install, so just stopped the 2.6.0 machine and started 2.5.2 back up.
      Only an hour of time lost, so not a big deal, but would love to hear of a sure fix!

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      • R
        RMH 0
        last edited by

        I put this in another thread which may help here too

        @rmh-0 said in After Upgrade inter (V)LAN communication is very slow on Hyper-V, for others WAN Speed is affected:

        A bit of digging and it looks like 2 issues to me.

        One in Hyper-V which I have now got resolved, fix below (well for me anyhow)
        One in pfsense that is missreporting throughput (I can live with that till a fix comes)

        For Hyper-V I found this article on RSC https://www.doitfixit.com/blog/2020/01/15/slow-network-speed-with-hyper-v-virtual-machines-on-windows-server-server-2019/
        Once I disabled RSC on all virtual switches my speed was back to normal. No restart needed, just go on to Hyper-V host, open powershell and input commands to disable RSC on each virtual switch.

        These are commands I used

        Get-VMSwitch -Name LAN | Select-Object RSC
        Checks status, if true run next command LAN is my vswitch name

        Set-VMSwitch -Name LAN -EnableSoftwareRsc $false
        This disables RSC, re run first command to confirm it is disabled

        If your vSwitch has a space in the name add "" around the name
        Get-VMSwitch -Name "WAN #1" | Select-Object RSC

        After applying speed is back to normal but pfsense seems to top out showing throughput at 60mb, even though I was getting over 500mb.

        Anyhow, hope it helps thers on Hyper-V (this is a 2019 instance of Hyper-V)

        D M H I 4 Replies Last reply Reply Quote 5
        • D
          Dominixise @RMH 0
          last edited by

          @rmh-0

          I can confirm this method you list works on my server with hyper-v pfsense vm :)

          Thanks thanks

          Dom

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          • M
            mxkied2 @RMH 0
            last edited by mxkied2

            Thank you @rmh-0

            I can can also confirm this fixed the speed issues for me as well,

            Only thing to note was that the command to check if RSC was enabled for me needed to include the wildcards

            Get-VMSwitch -Name LAN | Select-Object RSC

            needed to be

            Get-VMSwitch -Name LAN | Select-Object asteriskshereRSCasteriskshere

            otherwise I got no results. Just wanted to mention it.

            Forum posting is removing the asterisks place asterisks before and after RSC in the get command

            B R 2 Replies Last reply Reply Quote 0
            • B
              berbec @mxkied2
              last edited by

              @mxkied2 the wildcards seem to have been eaten by markup. Is it an asterisk before and after RSC?

              M 1 Reply Last reply Reply Quote 0
              • M
                mxkied2 @berbec
                last edited by mxkied2

                @berbec Yes, before and after

                1 Reply Last reply Reply Quote 0
                • G
                  GrimmSh0t @Dominixise
                  last edited by GrimmSh0t

                  @dominixise - I can confirm this works for me at least...Thanks for the post. Will do some more testing but for now running 2.6 with normal speeds.

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                  • R
                    RMH 0 @mxkied2
                    last edited by

                    @mxkied2 Sorry, I did not notice posting messed up the commands ran. I should have posted a screen shot of when I ran it. :(

                    M G 2 Replies Last reply Reply Quote 0
                    • M
                      mxkied2 @RMH 0
                      last edited by

                      @rmh-0

                      No worries at all, it did the same thing to me as you can see from the edits above. HUGE THANK YOU for finding a fix and posting it!

                      1 Reply Last reply Reply Quote 0
                      • G
                        GrimmSh0t @RMH 0
                        last edited by

                        @rmh-0

                        Here you go :
                        77f5621a-7a08-4df5-a4d5-f21cf787f29c-image.png

                        B 1 Reply Last reply Reply Quote 2
                        • B
                          berbec @GrimmSh0t
                          last edited by berbec

                          @grimmsh0t I just did this on my machine:

                          PS C:\Users\Administrator> Get-VMSwitch -Name * | Select-Object *RSC*
                          
                          SoftwareRscEnabled
                          ------------------
                                        True
                                       False
                                        True
                                        True
                                        True
                          
                          PS C:\Users\Administrator> Set-VMSwitch -Name * -EnableSoftwareRsc $false
                          Set-VMSwitch : Failed while modifying virtual Ethernet switch connection settings.
                          At line:1 char:1
                          + Set-VMSwitch -Name * -EnableSoftwareRsc $false
                          + ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
                              + CategoryInfo          : NotSpecified: (:) [Set-VMSwitch], VirtualizationException
                              + FullyQualifiedErrorId : OperationFailed,Microsoft.HyperV.PowerShell.Commands.SetVMSwitch
                          
                          PS C:\Users\Administrator> Get-VMSwitch -Name * | Select-Object *RSC*
                          
                          SoftwareRscEnabled
                          ------------------
                                       False
                                       False
                                       False
                                       False
                                       False
                          

                          Despite the error, it looks like using an * as the -Name option works. EDIT Error looks safe to ignore.

                          So that leaves us with one command to disable RSC and one commands to check the setting, assuming you don't have any vSwitches that need RSC:

                          Check: Get-VMSwitch -Name * | Select-Object *RSC*

                          Disable: Set-VMSwitch -Name * -EnableSoftwareRsc $false

                          I will upgrade to 2.6.0 tonight and report if this fixes the issue.

                          EDIT: I figured out why I was getting an error. I have a Private vSwitch, and that one can't have RSC enabled. The error would not have occured for normal vSwitches attached to ports on a Ethernet card.

                          1 Reply Last reply Reply Quote 2
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                          • H
                            hac76 @RMH 0
                            last edited by

                            @rmh-0 Thanks a lot, working for me too !

                            1 Reply Last reply Reply Quote 1
                            • I
                              ITEM93 @RMH 0
                              last edited by

                              @rmh-0
                              Thanks so much for posting this!
                              I can confirm that this fix worked for us as well!

                              1 Reply Last reply Reply Quote 1
                              • J
                                jvansyoc
                                last edited by

                                Windows Hyper-V 2019
                                Windows 10 VM behind PFsense 2.6.0

                                fceba6ae-4fa1-4eec-a79d-7b848bf7f260-image.png

                                https://www.doitfixit.com/blog/2020/01/15/slow-network-speed-with-hyper-v-virtual-machines-on-windows-server-server-2019/

                                No restart required

                                1 Reply Last reply Reply Quote 0
                                • J
                                  joez34
                                  last edited by

                                  A little late to the party here, but I can confirm that this is an issue in Server 2022 on a Dell R440
                                  Disabling RSC also fixes the issue.

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                                  • T
                                    tharun518
                                    last edited by

                                    Just want to share my experience on Windows Server 2022.

                                    Updating OS to latest version didn't fix it.

                                    Disabling RSC improved network performance. Download speed was pretty good, but upload was stuck at 65mbps and response time was worst.

                                    Only switching to ver 2.5.2 truly fixed my problem and getting 1gbps up/down now.

                                    1 Reply Last reply Reply Quote 0
                                    • T
                                      tischenkod
                                      last edited by

                                      A solved same problem by tunring on "Disable hardware TCP segmentation offload" and "Disable hardware large receive offload" options in System->Advanced->Networking

                                      1 Reply Last reply Reply Quote 0
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