tailscale 50 MB limit causes issues

[kinghrothgar]

I have all the latest versions installed, NanoKVM 2.2.1, Firmware 1.4.0, tailscale 1.80.3. My connection to the Web App over tailscale kept breaking. With the memory limit not set, it eventually consumes too much memory and breaks. With the memory limit set, it also was breaking. In both instances, the only way to fix it was to restart the NanoKVM.

After doing some debugging, I discovered that settings the GOMEMLIMIT to 50 MB causes tailscale to GC constantly. Even after doing tailscale down, tailscaled was using around +20% of the CPU. I did a go CPU profile, and it was constantly stuck in GC. 50 MB of vmem just isn't enough for the latest tailscales it appears. After tweaking it, I found that setting /etc/kvm/GOMEMLIMIT to 75 seemed to be the correct balance. I have been able to keep a Web App session open for over an hour and actual tailscaled memory usage hovers around 40 MB.