Re: Utility of PV on non-obsolete hardware

[Manuel Bouyer <bouyer%antioche.eu.org@localhost>]

On Thu, Apr 04, 2019 at 11:36:18AM +0200, Torbjörn Granlund wrote:
> I recently realised that GNU/Linux PV guests run poorly compared to PVH
> and HVM guests.  I only noticed that since my FreeBSD PVHVM guests
> greatly outperformed any other guests.
> 
> Now I tested a HVM guest for NetBSD 8.0 (-STABLE) on 3 random machines.
> The following table indicates wall clock build times for configure+make
> of a package (the GMP bignum library):
> 
>                   PV    HVM      HVM speedup
> AMD k10           282   207         36%
> Intel Goldmont    585   329         78%
> Intel Broadwell   225   188         20%

Is it for 64 or 32bits guests ?
PV MMU is slow for 64bit guests, but not that bad for 32bits.

-- 
Manuel Bouyer <bouyer%antioche.eu.org@localhost>
     NetBSD: 26 ans d'experience feront toujours la difference
--