Red Hat Bugzilla – Bug 463862
[LTC 6.0 FEAT] 201257:KVM high performance multinode support
Last modified: 2010-11-10 16:24:03 EST
Emily J. Ratliff <email@example.com> - 2008-09-24 13:53 EDT
1. Feature Overview:
Feature Id: 
a. Name of Feature: Xen high performance multinode support
b. Feature Description
Further improvements to the Xen hypervisor to become consistent with the base level kernel, i.e.
#cpu (256), amount of mem (6TB), scaling/perf/numa enhancements, automatic cpu pinning.
Customers are looking for improvements to limitation that are currently existent in XEN.
Additional Comments: 256 CPU Support (128 physical / 256 with HT) / 6TB Memory Support
2. Feature Details:
Arch Specificity: Both
Affects Core Kernel: Yes
Delivery Mechanism: Direct from community
Request Type: Kernel - Enhancement from Upstream
d. Upstream Acceptance: In Progress
Sponsor Priority 1
f. Severity: High
IBM Confidential: no
Code Contribution: 3rd party code
g. Component Version Target: Xen Enhancements
3. Business Case
Our flagship multi-node product, x3950 M2, will support up to 96 cpus by the end of 2008. We are
expecting this number to at least reach 256 logical threads in 2009/2010. Wtih 16GB DIMMS coming
out, expect the max memory to be as high as 6TB.
4. Primary contact at Red Hat:
5. Primary contacts at Partner:
Project Management Contact:
Monte Knutson, firstname.lastname@example.org, 877-894-1495
Kevin Stansell, email@example.com
Chris McDermott, firstname.lastname@example.org
Julio Alvarez, email@example.com
This should be a general requirement for the Virtualization environment for RHEL 6 (presumably KVM not Xen) to support a platform/system capable of 256 cores/system threads and up to 6TB of memory, in a NUMA configuration. If there's some split needed for those 2 components, or for any userland/ management/configuration/install pieces -- RH , please let us know.
Yes, this should all be against KVM and libvirt, not Xen. :)
Is it only physical constrains? Any virtual ones? For physical we should be fine.
IBM, please confirm this is fixed and if so, set the Verified field to "IBM"
We will follow the core RHEL6 limits here for KVM host support. Closing.
Red Hat Enterprise Linux 6.0 is now available and should resolve
the problem described in this bug report. This report is therefore being closed
with a resolution of CURRENTRELEASE. You may reopen this bug report if the
solution does not work for you.