On Jan 29, 2014, at 8:28 AM, Karl Pielorz <kpielorz_...@tdx.co.uk> wrote:

> 
> Hi,
> 
> With FreeBSD 10 being out now (Great!) - GENERIC appears now has everything 
> needed for Xen to run in PVHVM for amd64.
> 
> The man page for xen (man 4 xen) states you should have:
> 
> options NO_ADAPTIVE_MUTEXES
> options NO_ADAPTIVE_RWLOCKS
> options NO_ADAPTIVE_SX

The “NO_ADAPTIVE” settings are an optimization when running in environments 
where different guests run on the same physical CPU.  However, many cloud 
providers seem to statically pin CPUs to VMs, which means the adaptive lock 
optimization works as expected.

—
Justin
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