Thanks for the responses. My bad. I meant BSD10 vs BSD11 and not 11 vs 12.
Also I am not doing any migration. This is purely a normal runtime behavior difference. We have enabled all the host hypervisor VM-x best practices. So could you please clarify what you mean by “intercepts always enabled”? From: Anish <akgu...@gmail.com> Date: Saturday, May 4, 2019 at 8:54 PM Cc: "Bapat, Udayan" <udayan.ba...@netapp.com>, "freebsd-virtualization@freebsd.org" <freebsd-virtualization@freebsd.org> Subject: Re: BSD11 vs BSD12 KVM performance NetApp Security WARNING: This is an external email. Do not click links or open attachments unless you recognize the sender and know the content is safe. Hi Udayan, Intel VM-x and AMD SVM allow hypervisor to intercept TSC access for save/restore of VM migration, so when these intercepts are enabled, rdtsc will require switch between root and non-root mode which is expensive and may cost few hundreds of cpu cycles. Is it possible that one has these intercepts always enabled even when migration is not started? -Anish _______________________________________________ freebsd-virtualization@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-virtualization To unsubscribe, send any mail to "freebsd-virtualization-unsubscr...@freebsd.org"
