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Re: [Qemu-devel] QEMU NUMA and memory allocation problem

From: Eduardo Habkost
Subject: Re: [Qemu-devel] QEMU NUMA and memory allocation problem
Date: Fri, 17 May 2013 10:36:36 -0300
User-agent: Mutt/1.5.21 (2010-09-15)

On Fri, May 17, 2013 at 03:47:52PM +0800, Wanlong Gao wrote:
> On 05/16/2013 08:02 PM, Paolo Bonzini wrote:
> > Il 16/05/2013 11:50, Wanlong Gao ha scritto:
> >> To see that this 300M memory is allocated from host node0 again, but not 
> >> host node1 as
> >> I expected.
> >>
> >> We think that QEMU can't handled this numa memory allocation well, and it 
> >> will cause the
> >> cross node memory access performance regression.
> >>
> >> Any thoughts? Or, am I missing something?
> > 
> > Pinning memory to host NUMA nodes is not implemented.  Something like
> > AutoNUMA would be able to balance the memory the right way.
> Any plan to implement this? Or, handle this by QEMU is not necessary?
> I just enabled AutoNUMA on the host kernel, but the memory allocation
> numbers seems no change at all. Am I missing something?

I had plans to implement a mechanism to allow external tools to
implement manual pinning, but it is not one of my top priorities. It's
the kind of mechanism that may be obsolete since birth, if we have
AutoNUMA working and doing the right thing.


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