Hi Roger,

Thanks for looking.
I will try NFS v3 with my latency tests running. I did try NFS v3 before and I "think" there were still desktop lockups but for a much shorter time. But this is just a feeling.
Current kernel on both systems is: 5.13.19-100.fc33.x86_64.
If I find the time, I will try and add some kernel NFS RPC call timers with some printk's and maybe try Fedora35 on another system.

Terry
On 05/10/2021 19:53, Roger Heflin wrote:
That network looks fine to me

I would try v3.  I have had bad luck many times with v4 on a variety
of different kernels.  If the code is recovering from something
related to a bug 45 seconds might be right to decide something that
was working is no longer working.

I am not sure any amount of debugging would help (without having
really verbose kernel debugging).

What is the current kernel you are running and trying a new one might
be worth it.  Though I don't see nfs changes/fixes listed in the
5.14.* or 5.13.* kernels changelog in the rpm file (rpm -q
--changelog) and there are only a few listed at kernel.org for  those
kernels.

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