Re: bhyve 11.1->stable/12 ZVOL-WinGuest slowdown – r358848 far beyond imagination

[Orestes Leal Rodríguez]

I also have tested this today by moving from 12.0-STABLE to -CURRENT 
today (r360076M). I also use ZVOLs with virtio-blk(s) for the VM's block 
devices. I can say this is a pretty impressive work, kudos to the 
developers. this Windows 10 VM  now feels like it got a hardware upgrade 
(a big one). Kudos for merging r358848.

Orestes

On 4/18/20 10:51 AM, Harry Schmalzbauer wrote:
> 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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