[Bug 216760] Memory Management Freebsd Guest On QEMU-KVM HOst

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=216760

            Bug ID: 216760
           Summary: Memory Management Freebsd Guest On QEMU-KVM HOst
           Product: Base System
           Version: 11.0-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: bin
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: kvanbiesen at gmail.com
                CC: freebsd-amd64 at FreeBSD.org
                CC: freebsd-amd64 at FreeBSD.org

Performance Is Insanely low on when you install freebsd on a QEMU-KVM

command to test:
sysbench --num-threads=1 --test=memory --memory-total-size=1G run

FREEBSD 11 on QEMU-KVM

Operations performed= 1048576 (61139.84 ops/sec)
1024.00 transferred (59.71 MB/sec)

UBUNTU 11 on identical KVM:

Operations performed= 1048576 (2718486.33 ops/sec)
1024.00 transferred (2654.77 MB/sec)

FREEBSD on bare metal:
Around 2700MB/s

I tested this on several installations; BBother freebsd 10 and 11. On Different
KVM's, all the same results. Freebsd speeds are more than 60 times slower. 

Another user has tested this on servers KVM as in this reddit topic:
https://www.reddit.com/r/freebsd/comments/5rtf05/abysmal_memory_perfomance_witch_freebsd_under/

FReebsd as guest under vmware and virtualbox performs as normal (speeds way
over 2000MB)

Gonna file a bug report with QEMU as well

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