Nginx performance is poor and unstable

[ThestralWarrior]

Describe the bug

On building and running Nginx with Unikraft 0.19.0 and stress testing with wrk, a significant drop in performance is noted each time wrk is repeated on the same running instance of Nginx + Unikraft 0.19.0 when using buddy allocator, regardless of whether ukvmem is enabled or not. Eventually the performance stabilizes but the throughput is lower than it should be.

Steps to reproduce

1. Clone catalog-core
   git clone http://github.com/unikraft/catalog-core.git
2. Follow the instructions to build the Nginx unikernel image
3. Run the Nginx unikernel image using the instructions by passing 512MB-1GB of memory and -enable-kvm for x86-64
4. Open a separate terminal and run the following wrk commandwrk -t 14 -d1m -c 30 http://172.44.0.2/index.html
5. Repeat the wrk command and observe the fluctuations in throughput

Expected behavior

Consistent and high throughput.

Which architectures were you using or does this bug affect?

x86-64/AArch64

Which platforms were you using or does this bug affect?

QEMU/KVM