Re: QEMU PIC indirection patch for in-kernel APIC work

Evgeniy Polyakov
2007-04-10T12:30:37Z

On Tue, Apr 10, 2007 at 03:17:45PM +0300, Avi Kivity (avi-atKUWr5tajBWk0Htik3J/w@public.gmane.org) wrote:
> >Check a link please in case we are talking about different ideas:
> >http://marc.info/?l=linux-netdev&m=112262743505711&w=2
> >
> >
>
> I don't really understand what you're testing there. in particular, how
> can the copying time change so dramatically depending on whether you've
> just rebooted or not?

I tested page remapping time - i.e. time to replace a page in two
different mappings - the same should be performed in host and guest
kernels if such design is going to be used for communication.

I can only explain after-reboot slow copy with empty caches - arbitrary
kernel pages were copied into buffer (not the same data as in posted
code).

--
Evgeniy Polyakov