BSD11 vs BSD12 KVM performance

Harry Schmalzbauer freebsd at
Sat May 4 10:11:52 UTC 2019

Am 02.05.2019 um 20:51 schrieb Bapat, Udayan:
> Hi All,
> I work in performance team with NetApp, Inc.
> During qualification process of BSD11 as a guest, we observed that the cost of rdtsc call has magnified by 10x compared to BSD10. We are using qemu-2.10 that came as a default package in RH7.4. It appears that BSD11 was released before qemu-2.10 so I am not sure if we have any supportability issue and I would need to upgrade QEMU version.  In what way, I can do more debugging around this? We are also experimenting with ESX and we didn’t see this issue there. I also could not find any performance benchmarking around BSD+QEMU/KVM.

Hello, please clarify whether it is about FreeBSD-10 vs. FreeBSD-11, 
like the body tells, or FreeBSD-11 vs. FreeBSD-12, like the topic tells.
Can't help in any case regading the QMEU question, unfortunately.


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