[Bug 250516] Poor performance if running as guest OS on QEMU

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=250516

            Bug ID: 250516
           Summary: Poor performance if running as guest OS on QEMU
           Product: Base System
           Version: 12.1-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: misc
          Assignee: bugs at FreeBSD.org
          Reporter: cdang_2000 at yahoo.com

Hi,

I am new here and trying to find answers to the issue described below.

We make PCI chip which mainly plugged in Linux systems.
If I installed FreeBSD 12.1 on actual HW (i.e. x86), PCI throughput is fine and
compatible with other Linux OSes like Ubuntu or CentOS.

But, if I run it as a guest OS on QEMU, then the PCI throughput is very very
low. This is compared to the same tests I run on Ubuntu or CentOS as guest OS
on the same QEMU.

So, I would like to know:
1. Do you have any report about the same situation: PCI throughput is very low
if FreeBSD runs as guest OS on QEMU?
2. What kind of data you need me to capture in order for you to debug further?

Please let me know.

Thanks.

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