netdev - Re: [kvm-devel] QEMU PIC indirection patch for in-kernel APIC work

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Date:	Tue, 10 Apr 2007 16:30:37 +0400
From:	Evgeniy Polyakov <johnpol@....mipt.ru>
To:	Avi Kivity <avi@...ranet.com>
Cc:	Rusty Russell <rusty@...tcorp.com.au>, Ingo Molnar <mingo@...e.hu>,
	kvm-devel@...ts.sourceforge.net, netdev <netdev@...r.kernel.org>
Subject: Re: [kvm-devel] QEMU PIC indirection patch for in-kernel APIC work

On Tue, Apr 10, 2007 at 03:17:45PM +0300, Avi Kivity (avi@...ranet.com) 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
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