Hello,
after upgrading my ancient ivy-bridge (Xeon E3, no vAPIC CPU support)
from 11.1 to stable/12 I noteced a quiet heavy slowdown of my windows
guest (Server 2012R2).
The guest-disk is a ZVOL backed virtio-blk device, which I suspected
suffers from performance regressions – especially since I use them in
volmode=dev.
But then I found the guest spending almost one full vCPU cycles in
interrupt handling during light SQL load; something I rarely see on
windows. No idea what caused the slowdown, but I remembered r358848 –
which isn't MFCd yet, but I gave it a try.
Word's can't describe the surprise. Never imagined any Win-Guest on
bhyve can feel like that…
Thanks a lot to Sir Burmeister et. al.
Hope this will land in stable/12 soon.
Thanks,
-Harry
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