[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [Xen-devel] Re: [PATCH 3/5] x86/pvclock: add vsyscall implementation

On 10/27/09 10:29, Dan Magenheimer wrote:
> Is there any way for an application to conclusively determine
> programmatically if the "fast vsyscall" pvclock is functional
> vs the much much slower gettimeofday/clock_gettime equivalents?
> If not, might it be possible to implement some (sysfs?)
> way to determine this, that would also be backwards compatible
> to existing OS's that don't have pvclock+vsyscall supported?

It would probably be simplest and most portable for the app to just
measure the performance of gettimeofday and see if it meets its needs.


Xen-devel mailing list



Lists.xenproject.org is hosted with RackSpace, monitoring our
servers 24x7x365 and backed by RackSpace's Fanatical Support®.