Hi, I am a Masters student from Carnegie Mellon University. I am looking for a research topics for an Advanced OS & DS course we have. I wanted to know what is the current support for NUMA on Xen ? Does it support the IBM x440 and AMD64 Opteron ? Also, does the Xen scheduler do NUMA aware scheduling so it does not degrade the VM performace ? My group is currently looking into Scheduling policies for NUMA systems for multiple VMs. Let me know if its already done in Xen. Thanks, Deepti Chheda _______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com http://lists.xensource.com/xen-devel
> I wanted to know what is the current support for NUMA on Xen ? > Does it support the IBM x440 and AMD64 Opteron ? > Also, does the Xen scheduler do NUMA aware scheduling so it > does not degrade the VM performace ?There are NUMA memory allocator patches, but the scheduler is currently unaware of NUMA topology (though you can set things up manually using vcpu-pin). I suspect that for most users of small NUMA systems just spraying the VM data across nodes is the best way forward unless the user sets things up explicitly. The key scheduler extension we need at the moment is something that deals with the case where there are fewer runnable VCPUs than physical CPUS, and tries to ensure that they are spread appart across sockets and cores. i.e. don''t run them on two hyperthreads of the same core unless you have to. Ian> My group is currently looking into Scheduling policies for > NUMA systems for multiple VMs. > > Let me know if its already done in Xen. > > Thanks, > Deepti Chheda > > > _______________________________________________ > Xen-devel mailing list > Xen-devel@lists.xensource.com > http://lists.xensource.com/xen-devel >_______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com http://lists.xensource.com/xen-devel
* Deepti Chheda <dchheda@andrew.cmu.edu> [2006-10-04 03:19]:> Hi, > > I am a Masters student from Carnegie Mellon University. I am looking > for a research topics for an Advanced OS & DS course we have. > > I wanted to know what is the current support for NUMA on Xen ?Xen doesn''t have any NUMA support currently. I''ve posted [1]patches to add NUMA support into Xen. This support covers systems that provide ACPI SRAT tables describing the topology of the processors and memory of the system. It works for 32-bit and 64-bit system. The patches give Xen an NUMA-aware page allocator, update memory hypercalls to allocate node-local memory when creating VMs, and exports NUMA topology to user-space via the management tools.> Does it support the IBM x440 and AMD64 Opteron ?I''ve not tested on an x440, but the patches have been tested on an x445, x460, AMD opteron, Unisys ES7000, and IA64. I believe that the patches would work fine on an x440.> Also, does the Xen scheduler do NUMA aware scheduling so it does not > degrade the VM performace ?The current patchset does not address scheduling. 1. http://lists.xensource.com/archives/html/xen-devel/2006-09/msg00958.html -- Ryan Harper Software Engineer; Linux Technology Center IBM Corp., Austin, Tx (512) 838-9253 T/L: 678-9253 ryanh@us.ibm.com _______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com http://lists.xensource.com/xen-devel