Upgrade to 2.6.0 download speed is slow

[stephenw10]

Are you using those interfaces directly? VLANs? VPN?

Does the CPU load (per core) look OK?

Any errors on the NICs?

Steve

[benoithamet]

@dredex same here; speed test in front of PFSense about 100 Mbps, behind about 10 Mbps
No error anywhere, performances are normal (no CPU peak or anything showing performance issue)
It was perfect before upgrading to 2.6.0

[Dredex]

Did some further testing and the problem is with my PC, tried on another one HERE and the speeds are fine, probably smth with Win 11, NIC or drivers....

Sorry for misleading, I should have tested more before posting...

[JKnott]

@dredex

Yep, with broadband speeds these days, hardware can often make a difference. Before getting the computer described in my sig I had an old HP compact desktop computer. It would do better than 500 Mb down, but the new computer did much better. I've even seen over 900 Mb on my 500/20 connection.

[benoithamet]

to be clear this has nothing to do with hardware or OS
No changes have been done on the network and all devices (Windows or Android) have the same issue - so Windows can not be involved here - especially when WinUpdate has been done 2 days before the PFSense upgrade and no issue after it
This appears immediately after the upgrade from 2.5.2 to 2.6.0

[benoithamet]

I have deployed a new PFSense running 2.5.2 and the network connection is now as expected; speed test showing 100 Mbps as before the upgrade to 2.6.0
This confirms something is wrong with 2.6.0

[SteveITS]

@benoithamet What network cards do you have in the problem router?

[benoithamet]

@steveits PFSense is virtualized on Hyper V so it using vNIC
how this is relevant? there has been no change in the network configuration before or after PFSense upgrade
And the test with a PFSense running 2.5.2 has been done in the exact same configuration

[SteveITS]

@benoithamet said in Upgrade to 2.6.0 download speed is slow:

PFSense is virtualized on Hyper V

There have been a few threads this week about Hyper-V, such as
https://forum.netgate.com/topic/169884/after-upgrade-inter-v-lan-communication-is-very-slow-on-hyper-v/1

I haven't looked at it but it's always possible a FreeBSD driver changed between FreeBSD versions.

[benoithamet]

@steveits Thanks
This solves the trouble
The solution is https://www.doitfixit.com/blog/2020/01/15/slow-network-speed-with-hyper-v-virtual-machines-on-windows-server-server-2019/

Interestingly I never had any trouble until this upgrade

[stephenw10]

So specifically disabling RSC in the vswitches brings back the expected throughput for you?

[benoithamet]

@stephenw10 yes, on both LAN and WAN vSwitch
if only one still have the RSC enabled, the connection speed drops to 10% of the normal one

[stephenw10]

Interesting. Thanks for confirming.

[benoithamet]

@stephenw10 no thank you; I would not have thought about the hypervisor as I did not had any network trouble before

[hansklos]

@benoithamet I had the same problem after update to 2.6.0 ... Thank you for this post, it was a great help to me.

[propeto13]

so, what's the fix for those of us on bare-metal and not VMs?

[stephenw10]

To throughput issue after upgrading to 2.6?

From what? On what hardware? What sort of slow down are you seeing?