Il 18/02/2014 11:51, Michael S. Tsirkin ha scritto:
> I agree it's either COW breaking or (similarly) locking pages that > the guest hasn't touched yet. > > You can use prealloc or "-rt mlock=on" to avoid this problem. > > PaoloOr the new shared flag - IIRC shared VMAs don't do COW either.
Only if the problem isn't locking and zeroing of untouched pages (also, it is not upstream is it?).
Can you make a profile with perf? Paolo