[et-mgmt-tools] Re: [PATCH] Add virt-install option to auto choose cpuset value (NUMA)

[Ryan Harper]

* Cole Robinson <crobinso at redhat.com> [2008-03-14 14:50]:
> The patch below adds an option to virt-install to auto choose
> physical cpu pinning based on available memory on a NUMA machine.
> Conceivably this could be expanded in the future to auto choose
> by some other metric as well, but for now only a NUMA setup is
> implemented.
> 
> Using --cpuset=auto will create a traditional cpuset argument
> using all the cpus associated with the cell that best fits the
> requested guest memory.
> 
> The only question I have for those interested: Is best fit an 
> appropriate default choice? should there be a way to choose 
> another scheme (i.e. worst fit)?
Cole,

Thanks for the patch, looks good.  I believe best fit is a good choice.
For our NUMA systems, we want to fully utilize a single node before
moving work to a second node as to minimize the amount of memory traffic
over the interconnects.  Best-fit should do this by selecting cell with
the least amount of free ram that satisfies the request.

What's the best RH-flavor'ed platform for testing this patch out?
Fedora8, RHEL5u1?  

-- 
Ryan Harper
Software Engineer; Linux Technology Center
IBM Corp., Austin, Tx
(512) 838-9253   T/L: 678-9253
ryanh at us.ibm.com