Re: bhyve VM not getting as much upload bandwidth as the host
- In reply to: Patrick M. Hausen: "Re: bhyve VM not getting as much upload bandwidth as the host"
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Date: Mon, 14 Aug 2023 21:35:07 UTC
On 14/08/2023 11:38, Patrick M. Hausen wrote: [..] >> I never had this solved. Even my FreeBSD guest on FreeBSD host with VirtualBox is slow as few hunderds kB/s >> It was like 10Mbps with Bhyve. I only use VMs for testing but installing packages is always so slow. So you are not alone. I would really like to know how to improve the network speed with virtualized environment. > > This looks weird to me. I run lots of VMs in production on TrueNAS CORE > - essentially FreeBSD 13-STABLE with bhyve and all of them get near gigabit > speed with bridged networking. > > Guests: > > Windows > Ubuntu > FreeBSD (OPNsense) > > Specifically the OPNsense VM can route 700-800 Mbit/s across gigabit interfaces. > > All my VMs use VirtIO network drivers - do yours? NICs are emulated Intel PRO/1000 MT but I tested VirtIO in the past and it was the same. Now I tried to disable RXCSUM and TXCSUM on host interface and it fixed it. It is strange to me because I never had speed problem on the host it self so I do not suspect anything wrong on host's interface. 1) speedtest in VM with RXCSUM & TXCSUM enabled Hosted by Rohwerder Datasystems GmbH (Schwarzenbek) [463.71 km]: 42.018 ms Testing download speed Download: 7.37 Mbit/s Testing upload speed Upload: 25.16 Mbit/s 2) speedtest in VM right after I disabled RXCSUM & TXCSUM on the host Hosted by Rohwerder Datasystems GmbH (Schwarzenbek) [463.71 km]: 23.841 ms Testing download speed Download: 242.99 Mbit/s Testing upload speed Upload: 24.80 Mbit/s 250 Mbit/s is a full speed of my home internet connection. I don't know why but RXCSUM and TXCSUM cause more problems in my experiences. I remember I must disabled RXCSUM & TXCSUM in completely virtual environment of some cloud provider (based on KVM & Qemu) where we run about 10 machines and one of them should act like an Ipsec gateway fore a couple of private VMs. Packets were not forwarded between 2 NICs until i disabled RX & TX csums on private VirtIO NIC - all VMs were FreeBSD 12.3 at that time. Thank you! Best regards Miroslav Lachman