Date: Tue, 12 Apr 2022 06:04:02 -0400 From: mike tancsa <mike@sentex.net> To: Matt Garber <matt.garber@gmail.com> Cc: FreeBSD-STABLE Mailing List <freebsd-stable@freebsd.org> Subject: Re: vtnet rxcsum broken for forwarding RELENG_13 ? Message-ID: <35741162-a20b-51c7-e08c-fd8a88cf2b5f@sentex.net> In-Reply-To: <CANwXMPPUEYWOoYLcYGhzMpP=MOd-oNrT4S7NJUy8AE52cPRvEg@mail.gmail.com> References: <d30a54ad-6b93-456e-64fc-75d1b09b2fb3@sentex.net> <CANwXMPPUEYWOoYLcYGhzMpP=MOd-oNrT4S7NJUy8AE52cPRvEg@mail.gmail.com>
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On 4/11/2022 8:07 PM, Matt Garber wrote: > On Mon, Apr 11, 2022 at 7:15 PM mike tancsa <mike@sentex.net> wrote: > > > < details about busted rxsum snipped > > > I opened up https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=263229 > > > > Unless someone knows otherwise, I’ve been under the impression that PF > — or potentially any of the other FreeBSD firewalls (?), but I use PF > — has been “broken” in that regard on Linux KVM-based FreeBSD guests > for years. As such I’ve always needed to use csum_disable flags on the > vtnet interfaces or suffer *extremely* poor network performance, even > for servers not doing NAT forwarding. For forwarding / routing it certainly under performs compared to what it can do on bare metal, but for my application I need more security/management than network speed. Plus we all have more use case experience with pf at the office. It seems to top out at around 200Mb/s with the EM nics through the VM. My use case is perhaps 5-10Mb sustained. Hypervisor is CPU: AMD EPYC Processor (2100.07-MHz K8-class CPU). ---Mike > > 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-freebsd-guests.26289/ > > > > —Matt >
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