Date: Mon, 11 Apr 2022 20:07:43 -0400 From: Matt Garber <matt.garber@gmail.com> To: mike tancsa <mike@sentex.net> Cc: FreeBSD-STABLE Mailing List <freebsd-stable@freebsd.org> Subject: Re: vtnet rxcsum broken for forwarding RELENG_13 ? Message-ID: <CANwXMPPUEYWOoYLcYGhzMpP=MOd-oNrT4S7NJUy8AE52cPRvEg@mail.gmail.com> In-Reply-To: <d30a54ad-6b93-456e-64fc-75d1b09b2fb3@sentex.net> References: <d30a54ad-6b93-456e-64fc-75d1b09b2fb3@sentex.net>
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--00000000000036f02005dc69daf8 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Mon, Apr 11, 2022 at 7:15 PM mike tancsa <mike@sentex.net> wrote: > I was setting up a VM pf firewall and noticed I was not able to nat out > for some reason. Looking at the pcap, it seems when the vm is in > forwarding mode, I get tcp checksum errors. If I do a > > ifconfig vtnet1 -rxcsum > > ifconfig vtnet0 -rxcsum > > nat then seems to work fine > > The setup is a simple VM with the hypervisor libvirt/KVM ubuntu 20 LTS. > Guest is RELENG_13 from Apr 11/2022. If I change to em nics in the VM, > all is fine out of the box. > > > I opened up https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D263229 Unless someone knows otherwise, I=E2=80=99ve been under the impression that= PF =E2=80=94 or potentially any of the other FreeBSD firewalls (?), but I use PF =E2=80=94 = has been =E2=80=9Cbroken=E2=80=9D in that regard on Linux KVM-based FreeBSD guests f= or years. As such I=E2=80=99ve always needed to use csum_disable flags on the vtnet inte= rfaces or suffer *extremely* poor network performance, even for servers not doing NAT forwarding. E.g., see: https://serverfault.com/questions/817664/slow-network-fixed-adding-hw-vtnet= -csum-disable-1-what-are-the-posible-side-effe https://forum.proxmox.com/threads/poor-virtio-network-performance-on-freebs= d-guests.26289/ =E2=80=94Matt <https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D263229>; --00000000000036f02005dc69daf8 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable <div>On Mon, Apr 11, 2022 at 7:15 PM mike tancsa <<a href=3D"mailto:mike= @sentex.net">mike@sentex.net</a>> wrote:<br></div><div><div class=3D"gma= il_quote"><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8= ex;border-left-width:1px;border-left-style:solid;padding-left:1ex;border-le= ft-color:rgb(204,204,204)" dir=3D"auto">I was setting up a VM pf firewall a= nd noticed I was not able to nat out <br> for some reason. Looking at the pcap, it seems when the vm is in <br> forwarding mode, I get tcp checksum errors. If I do a<br> <br> ifconfig vtnet1 -rxcsum<br> <br> ifconfig vtnet0 -rxcsum<br> <br> nat then seems to work fine<br> <br> The setup is a simple VM with the hypervisor libvirt/KVM ubuntu 20 LTS.=C2= =A0 <br> Guest is RELENG_13 from Apr 11/2022. If I change to em nics in the VM, <br> all is fine out of the box.<br> <br><br> I opened up <a href=3D"https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D= 263229" rel=3D"noreferrer" target=3D"_blank">https://bugs.freebsd.org/bugzi= lla/show_bug.cgi?id=3D263229</a></blockquote><div dir=3D"auto"><br></div><d= iv dir=3D"auto"><br></div><div dir=3D"auto">Unless someone knows otherwise,= I=E2=80=99ve been under the impression that PF =E2=80=94 or potentially an= y of the other FreeBSD firewalls (?), but I use PF =E2=80=94 has been =E2= =80=9Cbroken=E2=80=9D in that regard on Linux KVM-based FreeBSD guests for = years. As such I=E2=80=99ve always needed to use csum_disable flags on the = vtnet interfaces or suffer *extremely* poor network performance, even for s= ervers not doing NAT forwarding.</div><div dir=3D"auto"><br></div><div dir= =3D"auto">E.g., see:<div dir=3D"auto"><br></div><div><a href=3D"https://ser= verfault.com/questions/817664/slow-network-fixed-adding-hw-vtnet-csum-disab= le-1-what-are-the-posible-side-effe">https://serverfault.com/questions/8176= 64/slow-network-fixed-adding-hw-vtnet-csum-disable-1-what-are-the-posible-s= ide-effe</a></div><div dir=3D"auto"><br></div><div dir=3D"auto"><div><a hre= f=3D"https://forum.proxmox.com/threads/poor-virtio-network-performance-on-f= reebsd-guests.26289/">https://forum.proxmox.com/threads/poor-virtio-network= -performance-on-freebsd-guests.26289/</a></div><br></div><div dir=3D"auto">= <br></div><div dir=3D"auto"><br></div><div dir=3D"auto">=E2=80=94Matt</div>= <div dir=3D"auto"><br></div></div><blockquote class=3D"gmail_quote" style= =3D"margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-style:solid;= padding-left:1ex;border-left-color:rgb(204,204,204)" dir=3D"auto"><a href= =3D"https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D263229" rel=3D"nore= ferrer" target=3D"_blank"></a></blockquote></div></div> --00000000000036f02005dc69daf8--
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