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What's your experience been running it in production? Any gotchas?

We use it to share filesystems into QEMU/KVM VMs, so far zero issues, but it's not a performance-constrained use case.

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.

Can you do a simple time sh -c "dd if=/dev/zero of=testfile bs=8k count=11000"; rm testfile

"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?

Its performance for me was 500% slower than NFS which was only 30% slower than direct IO.

No time to investigate.

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