Re: [Qemu-discuss] Disk Performance

[Stephan von Krawczynski]

On Fri, 30 May 2014 16:53:50 +0000
address@hidden wrote:

> On Fri, May 30, 2014 at 06:47:15PM +0200, Stephan von Krawczynski wrote:
> 
> > > I'm no expert on this, but it sounds to me like the file copy is using
> > > memory to cache disk blocks, swapping out the memory that is the
> > > emulated memory of the guests.  It seems to me that the solution to
> > > that is to force the Qemu process's memory space to remain in RAM.
> > > 
> > > Is there a way to do that in Linux?
> > 
> > No.
> 
> Unrelated to solving the original problem, just wanted to point out this
> is in fact trivially possible, and there have been patches in the past
> to implement it.
> 
> See http://lists.gnu.org/archive/html/qemu-devel/2012-09/msg05081.html
> and http://linux.die.net/man/2/mlockall
> 
> 
> David

Well, I guess you mean "-realtime mlock=on" option. It did not help me.

Regards,
Stephan