9p is a better network filesystem protocol, and it's available on Linux.
I do have some plans to do benchmarks for another use case that's more performance intensive, but it's buried in my backlog right now.
"performance" test?
Also do the read test on a really big file, first from your host - so the file will get cached, then from within the qemu-vm where virtfs plan9 is mounted, dd if=bigfile of=/dev/null
Please, I want to confirm its not only my machines suffering from really totally shitty read/write performance thru virtfs?
No time to investigate.
Compare https://ericvh.github.io/9p-rfc/rfc9p2000.html vs https://tools.ietf.org/html/rfc5661